taxonID	type	description	language	source
B77687CEFFD0FFDFFDF78346FD29FA17.taxon	discussion	Remarks The systematic classification follows Carter et al. (2011). Note that several of the genus- and species-group names listed below are attributed to families other than the Parallelodontidae at present. Their current systematic classification is indicated in the respective Remarks sections.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD0FFD8FD79849AFEE0FE25.taxon	description	Original source Girty (1912): 3.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD0FFD8FD79849AFEE0FE25.taxon	type_taxon	Type species Alula squamulifera Girty, 1912; by original designation. Upper Permian, United States of America (Colorado).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD0FFD8FD79849AFEE0FE25.taxon	description	Gender Female.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD0FFD8FD79849AFEE0FE25.taxon	discussion	Remarks Originally related to the family Parallelodontidae; according to Ding et al. (1982) part of the family Grammysiidae Miller, 1877; according to Morris et al. (1991) included in the family Sanguinolitidae Miller, 1877.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD7FFD8FD5B80F5FE0BFC01.taxon	description	Original source Cope (1997 a): 739.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD7FFD8FD5B80F5FE0BFC01.taxon	type_taxon	Type species Alytodonta gibbosa Cope, 1997; by original designation. Lower Silurian, Scotland.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD7FFD8FD5B80F5FE0BFC01.taxon	description	Gender Female.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD7FFD8FD5B80F5FE0BFC01.taxon	discussion	Remarks Originally placed in the family Parallelodontidae by Cope (1997 a); placed in the family Frejidae by Cope & Kříž (2013).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD7FFD8FE9F82A8FDC0F995.taxon	description	Original source Astafieva-Urbajtis & Ramovš (1985): 14.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD7FFD8FE9F82A8FDC0F995.taxon	type_taxon	Type species Antonella catelliformis Astafieva-Urbajtis in Astafieva-Urbajtis & Ramovš, 1985; by original designation. Upper Carboniferous, Slovenia.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD7FFD8FE9F82A8FDC0F995.taxon	description	Gender Female.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD7FFD8FE9F82A8FDC0F995.taxon	discussion	Remarks Junior homonym of Antonella Cooke & Kondo, 1961 [Gastropoda]; no replacement name available. Originally placed in the “ Catella Group ” of the Parallelodontidae (subfamily Grammatodontinae) by Astafieva-Urbajtis & Ramovš (1985).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD7FFD9FDE38705FBE4FE63.taxon	description	Original source Cossmann (1897): 93.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD7FFD9FDE38705FBE4FE63.taxon	type_taxon	Type species Macrodon rugosus Buckman, 1845; by typification of replaced name. Jurassic, United Kingdom.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD7FFD9FDE38705FBE4FE63.taxon	description	Gender Female.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD7FFD9FDE38705FBE4FE63.taxon	discussion	Remarks Introduced as a new name for Macrodon Buckman, 1845, non Schinz, 1822 [Pisces]. Cossmann indicated Cucullaea hirsonensis d’Archiac, 1843 as the type species, however under Art. 67.8 the type species of Beushausenia is the type species of Macrodon. Junior objective synonym of Parallelodon, which is an earlier replacement name. Beushausenia Maillieux, 1913 [in Maillieux 1913 a] (Pterineidae) is a junior homonym (replaced by Beushausenella Maillieux, 1913 [in Maillieux 1913 b]).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD6FFD9FD88834EFEABFB98.taxon	description	Original source Meek & Worthen (1870): 39.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD6FFD9FD88834EFEABFB98.taxon	type_taxon	Type species Carbonarca gibbosa Meek & Worthen, 1870; by subsequent designation by Newell (1969). Carboniferous, United States of America (Illinois).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD6FFD9FD88834EFEABFB98.taxon	description	Gender Female.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD6FFD9FD88834EFEABFB98.taxon	discussion	Remarks Originally no classification indicated. Questionably assigned to the family Parallelodontidae by Newell (1969).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD6FFD9FDBD8507FD19F9D3.taxon	description	Original source Branson (1942): 248.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD6FFD9FDBD8507FD19F9D3.taxon	type_taxon	Type species Arca keyserlingii d’Orbigny, 1850; by original designation. Upper Jurassic, Russia.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD6FFD9FDBD8507FD19F9D3.taxon	description	Gender Male.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD6FFD9FDBD8507FD19F9D3.taxon	discussion	Remarks Cosmetodon was erected as subgenus of Grammatodon Meek & Hayden, 1860; this was followed by Newell (1969) and recent studies (e. g., Ros-Franch et al. 2014; Prinoth & Posenato 2023). Nevesskaja et al. (2013) treated it as a distinct genus.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD6FFDAFD4087DFFBECFDB5.taxon	description	Original source Chao (1927): 10.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD6FFDAFD4087DFFBECFDB5.taxon	type_taxon	Type species Cucullopsis quadrata Chao, 1927; by original designation. Upper Carboniferous to lower Permian, China.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD6FFDAFD4087DFFBECFDB5.taxon	description	Gender Female.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD6FFDAFD4087DFFBECFDB5.taxon	discussion	Remarks Originally placed in the family Parallelodontidae. Questionably assigned to the “ Grammatodon group ” of the family Parallelodontidae according to Newell (1969). Consistently treated as a distinct genus (e. g., Astafieva-Urbajtis & Ramovš 1978; Fang et al. 2009; Nevesskaja et al. 2013).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD5FFDAFDF38365FCDBFBF2.taxon	description	Original source Meek & Hayden (1860): 419.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD5FFDAFDF38365FCDBFBF2.taxon	type_taxon	Type species Arca (Cucullaea) inornata Meek & Hayden, 1858; by monotypy. Upper Jurassic, United States of America (Nebraska).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD5FFDAFDF38365FCDBFBF2.taxon	description	Gender Male.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD5FFDAFDF38365FCDBFBF2.taxon	discussion	Remarks Originally part of the family “ Arcadae ”. Type genus of the parallelodontid subfamily Grammatodontinae (Newell 1969; Carter et al. 2011; Knight & Morris 2020).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD5FFDAFD8F853DFE99F92A.taxon	description	Original source Buckman (1845): 98.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD5FFDAFD8F853DFE99F92A.taxon	type_taxon	Type species Macrodon rugosus Buckman, 1845; by monotypy. Jurassic, United Kingdom.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD5FFDAFD8F853DFE99F92A.taxon	description	Gender Male.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD5FFDAFD8F853DFE99F92A.taxon	discussion	Remarks Originally no classification indicated. Junior homonym of Macrodon Schinz, 1822 [Pisces]; replaced with Parallelodon by Meek & Worthen (1866 a). The widely used “ Macrodus ” is an incorrect subsequent spelling.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD5FFDBFD9387F5FDD0FD96.taxon	description	Original source Prantl & Růžička (1955 b): 4 [Russian], 9 [English].	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD5FFDBFD9387F5FDD0FD96.taxon	type_taxon	Type species Mnataia pribyli Prantl & Růžička, 1955; by original designation. Middle Devonian, Czech Republic.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD5FFDBFD9387F5FDD0FD96.taxon	description	Gender Female.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD5FFDBFD9387F5FDD0FD96.taxon	discussion	Remarks Originally placed in “ a special group of pseudocyrtodont pelecypods ”; questionably synonymised with Parallelodon by Newell (1969). Amler & Friedel (2025) discussed potential cyrtodontid and parallelodontid affinities, yet without conclusion. The genus and species were erected based on a single incomplete valve of 6 mm in length.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD4FFDBFD47831AFC84FB28.taxon	description	Original source Conrad (1869): 97.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD4FFDBFD47831AFC84FB28.taxon	type_taxon	Type species Arca (Macrodon) eufalensis Gabb, 1860; by original designation. Cretaceous, United States of America (New Jersey).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD4FFDBFD47831AFC84FB28.taxon	description	Gender Male.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD4FFDBFD47831AFC84FB28.taxon	discussion	Remarks Originally no classification indicated; according to Newell (1969) part of the “ Cucullaria group ” of the parallelodontid subfamily Grammatodontinae; according to Carter et al. (2011) part of the tribe Nemodontini (Parallelodontidae: Grammatodontinae).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD4FFDBFD8A85F7FEABF8BC.taxon	description	Original source Astafieva-Urbajtis (1994): 114.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD4FFDBFD8A85F7FEABF8BC.taxon	type_taxon	Type species Antonella bedici Astafieva-Urbajtis in Astafieva-Urbajtis & Ramovš, 1985; by original designation. Upper Carboniferous, Slovenia.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD4FFDBFD8A85F7FEABF8BC.taxon	description	Gender Male.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD4FFDBFD8A85F7FEABF8BC.taxon	discussion	Remarks Introduced in a distinct subfamily Obliquidontinae Astafieva-Urbajtis, 1994 in the family Parallelodontidae. The subfamily was considered a synonym of Grammatodontinae by Bieler et al. (2010).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD4FFD4FDF9866CFDEBFE06.taxon	description	Original source Paul (1941): 130.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD4FFD4FDF9866CFDEBFE06.taxon	discussion	Remarks Nomen nudum – Paul mentioned and used the subgenus in his Fossilium Catalogus but did not provide a description. Originally questionably classified as a subgenus of Grammatodon. Paul (1941) classified Myalina goldfussiana De Koninck, 1842 and Modiola illinoiensis Worthen, 1884 in the new subgenus, but did not indicate a type species.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDBFFD4FDF680A9FE2AFBBF.taxon	description	Original source Meek & Worthen (1866 a): 17.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDBFFD4FDF680A9FE2AFBBF.taxon	type_taxon	Type species Macrodon rugosus Buckman, 1845; by typification of replaced name. Jurassic, United Kingdom.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDBFFD4FDF680A9FE2AFBBF.taxon	description	Gender Male.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDBFFD4FDF680A9FE2AFBBF.taxon	discussion	Remarks New name for Macrodon Buckman, 1845, non Schinz, 1822 [Pisces]. Beushausenia Cossmann, 1897, is another, younger replacement name. Originally no classification; type genus of the family Parallelodontidae.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDBFFD4FD988562FD5AF947.taxon	description	Original source Hall (1885): xlviii.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDBFFD4FD988562FD5AF947.taxon	type_taxon	Type species Palaeanatina quadrata Hall, 1883; by original designation. Devonian, United States of America (Pennsylvania).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDBFFD4FD988562FD5AF947.taxon	description	Gender Male. Hall (1885) and several subsequent authors (e. g., Chadwick 1935; Linsley 1994) considered the name as neuter, based on the Greek origin of the suffix ‘ - rhynchus ’ (‘ ῥῠ ́ γχος, rhynchos’), but since the ending was Latinised the name is deemed to be masculine according to ICZN Art. 30.1.3.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDBFFD4FD988562FD5AF947.taxon	discussion	Remarks Junior homonym of Prorhynchus Schultze, 1851 [flatworm]. Originally no classification suggested, but Hall discussed a relationship to “ Palaeanatinae ” (= Modiomorphidae); synonymous to Parallelodon after Newell (1969); part of the family Leiopteriidae Maillieux, 1921 according to Vokes (1967), which is today considered as a synonym of Pterineidae Meek, 1864 (Bieler et al. 2010); Amler & Friedel (2025) doubted affinities with parallelodontid arcoids.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDBFFD5FDA7866AFACEFC23.taxon	description	Original source Prantl & Růžička (1955 a): 303 [Czech], 308 [Russian], 313 [English]; originally as “ Šufia ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDBFFD5FDA7866AFACEFC23.taxon	type_taxon	Type species Sufia paradoxa Prantl & Růžička, 1955; by original designation. Middle Devonian, Czech Republic.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDBFFD5FDA7866AFACEFC23.taxon	description	Gender Female.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDBFFD5FDA7866AFACEFC23.taxon	discussion	Remarks Originally placed in “ a special group of pseudocyrtodont pelecypods ”; questionably synonymised with Parallelodon by Newell (1969). Amler & Friedel (2025) discussed potential cyrtodontid and parallelodontid affinities, yet without conclusion. The genus and species were erected based on a single incomplete valve of 6 mm in total. Species-group names In addition to the names below, we recently detected a number of “ new ” parallelodontid species names on a webpage (https: // www. paleontology. cz /; accessed on 16 Oct. 2025), partly with illustrations and indication of type material. However, none of these names appear in the published literature or fulfil the requirements of the ICZN for availability. Inquiries for further details from the website operator remained unanswered. The names are not listed here to avoid introducing nomina nuda in the published literature.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDAFFD5FDF1828EFC3DF9EA.taxon	description	Original source De Stefani (1917): 26, pl. 1 figs 11, 13 – 14, 17, 20, 22; originally as “ Achiardii ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDAFFD5FDF1828EFC3DF9EA.taxon	materials_examined	Type stratum and age Rio Marina Formation, Pennsylvanian, Carboniferous (De Stefani 1914; Bortolotti et al. 2001). Type locality “ Cala Baccetti ”; a small bay south of Cavo, Elba Island, Italy. Type material Studied material (IGF 122 E to IGF 125 E, IGF 128 E to IGF 144 E) is stored in the De Stefani collection at the Museo di Storia Naturale di Firenze.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDAFFD5FDF1828EFC3DF9EA.taxon	discussion	Remarks No subsequent mention in literature. De Stefani had plenty of specimens and gave a detailed description of the hinge teeth, which support an affinity to Parallelodon.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDAFFD6FDFE8736FE66FDC5.taxon	description	Original source Chapman (1908): 39, pl. 4 fig. 57; originally as “ aequalis ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDAFFD6FDFE8736FE66FDC5.taxon	materials_examined	Type stratum and age “ Silurian (Melbournian). In brown mudstone ”; Melbourne Formation, Murrindindi Supergroup, lower Ludlow, Silurian. Type locality “ Yarra Improvement Works, S. Yarra ”; South Yarra, County of Bourke, Victoria, Australia. Type material Holotype is a steinkern of a LV (P 7924). Stored in the collections of the Museums Victoria, Melbourne.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDAFFD6FDFE8736FE66FDC5.taxon	discussion	Remarks Mentioned in the type catalogue of Gill & Davies (1968). The morphology of this species rather matches Schizodus King, 1844 (Trigoniida: Schizodidae). Systematic classification is therefore questionable (Amler & Friedel 2025).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD9FFD6FE7383D5FBD5FACB.taxon	description	Original source Tornquist (1896): 96 [630], pl. 19 fig. 9.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD9FFD6FE7383D5FBD5FACB.taxon	materials_examined	Type stratum and age “ [in der] schiefrigen Facies des Kohlenkalks ” (Tornquist 1895: 23) [shaly facies of the Carboniferous Limestone]; middle to upper Visean, Mississippian, Carboniferous (Amler 1987). Type locality “ Hohlweg unterhalb der Ferme [Bauernhof] Pütig ”; along the route from Bourbach-le-Haut to Masevaux, Département Haut-Rhin, France. Type material The whereabouts of the material studied by Tornquist (1896) are unknown. He stated the material as belonging to the “ Geologische Landesanstalt Elsass-Lothringen ”. Amler (1987) stated that the Tornquist collection in the Strasbourg Museum was destroyed in a fire (see also Hubmann 2014).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD9FFD6FE7383D5FBD5FACB.taxon	discussion	Remarks Synonym of Parallelodon koeneni (Tornquist, 1896) according to Amler (1987).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD9FFD7FDE984D7FD79FE06.taxon	description	Original source De Koninck (1885): 163, pl. 25 fig. 39, pl. 26 fig. 19.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD9FFD7FDE984D7FD79FE06.taxon	materials_examined	Type stratum and age “ calcaire d’Anseremme (étage II) ”; Waulsort Formation, upper Tournaisian, Mississippian, Carboniferous. Type locality “ Anseremme ”; Anseremme, Dinant, Belgium. Type material The syntypes are stored at the Royal Belgian Institute of Natural Sciences, Brussels, coll. no. RBINS a 4736 (pl. 25 fig. 39, not traced) and RBINS a 4737 (old no. 697; pl. 26 fig. 19; coll. Dupont).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD9FFD7FDE984D7FD79FE06.taxon	discussion	Remarks De Koninck (1885) used multiple original spellings; “ amoenus ” in the description of the species, “ amӕnus ” (amaenus) in the plate caption. Subsequent workers, including De Koninck himself, only used “ amoenus ”, suggesting that “ amӕnus ” was a printing error. Listed as potential synonym of Parallelodon clathratus (McCoy, 1844) by Amler (1987).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD8FFD0FE1D8561FB2DFE30.taxon	description	Original source d’Orbigny (1850): 134.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD8FFD0FE1D8561FB2DFE30.taxon	materials_examined	Type stratum and age Lower Limestone of Limestone Group; today known as Ballyshannon Limestone Formation of the Tyrone Group (Chadian – Arundian, Visean, Mississippian, Carboniferous) [from Psammobia decussata McCoy, 1844]. Type locality “ Little Island, Cork ”; County Cork [from Psammobia decussata McCoy, 1844], Ireland. Type material Lectotype (designated by Hind 1897, as “ the type ”): NMING: F 7260 (Griffith coll.). Also figured by Hind (1897: 159, pl. 11 fig. 22). Stored at the National Museum of Ireland, Dublin [from Psammobia decussata McCoy, 1844].	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD8FFD0FE1D8561FB2DFE30.taxon	discussion	Remarks This name was introduced by De Koninck in d’Orbigny (1850) as a replacement name for the secondary homonym Psammobia decussata McCoy, 1844. The homonymy was not explicitly stated in d’Orbigny (1850), it became only clear in the expanded description in De Koninck (1851: 671, pl. 57 fig. 7 a – b), where he indicated the homonymy as “ non Arca decussata, Münster, et Nyst ”. These species are the Jurassic Arca decussata Roemer, 1836 from northern Germany (who attributed the authorship to Münster) and the Oligocene Arca decussata Nyst & Westendorp, 1839 from Belgium (which is sometimes erroneously indicated as of Nyst, 1835; see, e. g., Sandberger 1858 – 1863). An additional senior homonym is the extant Arca decussata Linnaeus, 1758. Later, De Koninck (1885) revised his earlier assessment and classified the species in Parallelodon. Since there was no homonymy anymore, he reinstated McCoy’s name (as Parallelodon decussatus), with Arca anatina being its junior objective synonym. Arca anatina has not been used after that (compare ICZN 1999, Art. 59.3); valid as P. decussatus.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD8FFD7FDFA80A9FB15FBBF.taxon	description	Original source Winter (1963): 51, pl. 6 figs 8 – 10 b.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFD8FFD7FDFA80A9FB15FBBF.taxon	materials_examined	Type stratum and age “ Supai Formation, Permian ”; Supai Formation, Artiskian / Kungurian, Cisuralian, Permian. Type locality “ [Loc. 3] ”; Between Cibecue and Fort Apache, route 73 between route 70 and Cedar Creek / Silver Butte, at the eastern side of the route, Navajo County, Arizona, United States of America. Type material Holotype (28024 / 2: 1; pl. 6 fig. 9 a – b) and additional type material (28024 / 1: 1; pl. 6 figs 10 a – b and 28024 / 3: 1; pl. 6 fig. 8) stored at the American Museum of Natural History, New York.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDFFFD0FD87856EFD16F9D4.taxon	description	Original source Hind (1904): 137, pl. 23 figs 11 – 13.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDFFFD0FD87856EFD16F9D4.taxon	materials_examined	Type stratum and age “ bed of shale above the Underset Limestone ”; shale above or part of the Four Fathom Limestone Member, Alston Formation, Yoredale Group, Visean / Serpukhovian, Mississippian, Carboniferous. Type locality “ Nine Standard Rigg, Westmoreland ”; Westmoreland, Cumbria, United Kingdom. Type material The figured syntypes are stored at the Natural History Museum, London, coll. Hind. Two steinkerns of RV (NHMUK PI L 47717; pl. 23 fig. 11 and NHMUK PI L 47718; pl. 23 fig. 12) and a steinkern of a LV (NHMUK PI L 47719; pl. 23 fig. 13, 13 a).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDFFFD0FD8880F8FC10FC43.taxon	description	Original source Hall (1885): 493, pl. 96 fig. 7.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDFFFD0FD8880F8FC10FC43.taxon	materials_examined	Type stratum and age “ Upper part of the Chemung group ”; Brallier Formation, Upper Devonian (Berg et al. 1993). Type locality “ Warren, Pa. ” [Warren, Pennsylvania], United States of America. Type material Whereabouts unknown.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDFFFD0FD8880F8FC10FC43.taxon	discussion	Remarks Linsley (1994) attributed the species to the genus Parallelodon.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDFFFD1FE3887DBFEEDFD02.taxon	description	Original source Goldfuss (1833 – 1841): 145, pl. 122 fig. 8 a – c.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDFFFD1FE3887DBFEEDFD02.taxon	materials_examined	Type stratum and age “ dolomitischer Zechstein ”; Z 1, Zechstein, Changhsingian, Lopingian, Permian. Type locality “ Glücksbrunn ”; part of the town Bad Liebenstein, Thuringia, Germany. Type material Lectotype is a BV specimen (SNSB-BSPG AS VII 2095) designated and figured by Friedel et al. (2025: fig. 2 c – e). Additional specimens are a steinkern of RV (SNSB-BSPG AS VII 2096) and a steinkern of LV (SNSB-BSPG AS VII 2097). All are stored at the Bavarian State Collections of Natural History, Bavarian State Collection for Palaeontology and Geology, Munich.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDFFFD1FE3887DBFEEDFD02.taxon	discussion	Remarks Recently considered as a junior synonym of Parallelodon striatus (von Schlotheim, 1820) by Friedel et al. (2025).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDEFFD1FDEB83AEFDF6FABB.taxon	description	Original source De Koninck (1885): 152, pl. 25 figs 37 – 38.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDEFFD1FDEB83AEFDF6FABB.taxon	materials_examined	Type stratum and age “ calcaire carbonifère des Pauquys (étage II) ”; Waulsort Formation, upper Tournaisian, Mississippian, Carboniferous. Type locality “ Pauquys ”; Hastière, Namur, Wallonia, Belgium. Type material The illustrated syntype is stored at the Royal Belgian Institute of Natural Sciences, Brussels (RBINS a 4695; old no. 652; coll. Dupont).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDEFFD2FDF48467FD4EFEFA.taxon	description	Original source Barrois (1891): 200, pl. 3 fig. 3 a – b.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDEFFD2FDF48467FD4EFEFA.taxon	materials_examined	Type stratum and age “ Grès armoricain ”; upper Arenig (Babin 1966), Middle Ordovician. Type locality “ Chapelle-Glain ”; Loire-Atlantique département, Region Pays de la Loire, France. Type material Whereabouts unknown.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDEFFD2FDF48467FD4EFEFA.taxon	discussion	Remarks Douvillé (1913: 440) placed the species in Actinodonta Phillips in Phillips & Salter, 1848, followed by other palaeontologists (Dechaseaux 1952: 270; Eberzin 1960: 72), whereas Cox (1960) mentioned its true Parallelodon morphology. Pojeta (1971: 17 – 18) classified the species in “ Pseudarca [Siliquarca] ” (Lyrodesmatidae). Amler & Friedel (2025) noted that P. antiquus does not show the typical morphological characteristics of Palaeozoic parallelodontids, particularly with regard to the hinge arrangement, and therefore, doubt the assignment to Parallelodon.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDDFFD2FD908026FACFFC43.taxon	description	Original source Phillips (1836): 210, pl. 5 fig. 20.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDDFFD2FD908026FACFFC43.taxon	materials_examined	Type stratum and age Top of Lower Scar Limestones; probably Great Scar Limestone, Visean, Mississippian, Carboniferous (Phillips 1836: 241; compare Amler 1987: 160). Type locality “ Bolland ”; south of Ogden Reservoir, west of Queensbury, Bradford, West Yorkshire, United Kingdom. Type material Hind (1897: 174) mentioned the type specimen being stored at the Natural History Museum, London, coll. Gilbertson. We did not trace the specimen.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDDFFD2FD908026FACFFC43.taxon	discussion	Remarks Placed in Parallelodon by De Koninck (1885: 154); however, Hind (1897: 174) doubted this assignment.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDDFFD2FDFD856EFE6EF9FB.taxon	description	Original source Whidborne (1892): 39, pl. 1 fig. 1, 1 a.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDDFFD2FDFD856EFE6EF9FB.taxon	materials_examined	Type stratum and age Wolborough limestone, probably East Ogwell Limestone, Givetian, Devonian (House 2002). Type locality “ Wolborough ”; Wolborough quarry (SX 8522 7047) near Newton Abbot, County Devon (House 2002), United Kingdom. Type material The single LV is part of the coll. Vicary (there labelled as Sanguinolites according to Whidborne). Whereabouts unknown.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDDFFD3FD8E8726FACFFD26.taxon	description	Original source De Koninck (1842): 114, pl. 3 figs 17 a – b, 20 a – b; originally as “ aviculoïdes ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDDFFD3FD8E8726FACFFD26.taxon	materials_examined	Type stratum and age “ calcaire de Visé ” (De Koninck 1842); specified as “ calcaire carbonifère de Visé (étage III) ” by De Koninck (1885); V 3 b and V 3 c, Visean, Mississippian, Carboniferous (Demanet 1958: 29; Godefroid et al. 2006). Type locality “ Visé ”; quarries south of Visé, on the east side of the Meuse River valley (Demanet 1958; Godefroid et al. 2006), Belgium. Type material The illustrated syntypes are stored in the collection of the Géologie de l’Université Lyon; a BV specimen (UCBL-EM 35420; pl. 3 fig. 17) as Arca aviculoides var. and a BV specimen (UCBL-EM 35421; pl. 3 fig. 20). Additional material (BV specimen; UCBL-EM 35422) is not figured.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDDFFD3FD8E8726FACFFD26.taxon	discussion	Remarks Bronn (1848: 92) assigned the species to Cucullaea; later placed in Parallelodon by De Koninck (1885).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDCFFD3FD9C838AFB28FA92.taxon	description	Original source Clarke (1907): 234, unnumbered text-fig.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDCFFD3FD9C838AFB28FA92.taxon	materials_examined	Type stratum and age “ Lower Devonic ”; Dalhousie Group, Lower Devonian. Type locality “ Dalhousie, N. B. ”; New Brunswick, Canada. Type material Not traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDCFFD3FD9C838AFB28FA92.taxon	discussion	Remarks Also described in Clarke (1909); listed but not discussed by Alekseeva (1993). Due to the lack of hinge characters, Amler & Friedel (2025) questioned a classification in Parallelodontidae.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDCFFCCFDCD841DFE22FECD.taxon	description	Original source Ragozin (1931): 7, pl. 1 fig. 1, pl. 3 figs 5 – 9, 12.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDCFFCCFDCD841DFE22FECD.taxon	materials_examined	Type stratum and age Lower Balakhonka [Balakhonskaya] Formation, Upper Pennsylvanian, Carboniferous (Amler & Silantiev 2022). Type locality “ Pravyy bereg reki Mrassu, v dvukh kilometrakh vyshe ulusa Kameshok ” [right bank of the river Mrassu, two kilometres above the Kameshok locality]; Kuznetsk Basin, West Siberia, Russia. Type material Whereabouts unknown.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFDCFFCCFDCD841DFE22FECD.taxon	discussion	Remarks Khalfin (1950: 51) classified the species in the freshwater genus Kinerkaella Khalfin, 1950 (Myalinida: Prokopievskiidae).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC3FFCCFE9080DEFBA6FC56.taxon	description	Original source Astafieva-Urbajtis & Ramovš (1985): 16, pl. 1 fig. 5 a – b.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC3FFCCFE9080DEFBA6FC56.taxon	materials_examined	Type stratum and age “ verkhniy karbon, gzhel’skiy yarus ”; Auernig Formation, Gzhelian, Carboniferous. Type locality “ Yugoslaviya, gory Karavanke [...] Planina pod Golico 2 ”, Karavanke Mts, Slovenia. Type material Type material is stored at the Gornjesavski muzej Jesenice, Slovenia, formerly Technical Museum of zelezarne Jesenica. Holotype with coll. no. USMJ 854.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC3FFCCFE9080DEFBA6FC56.taxon	discussion	Remarks This is the type species of the genus Obliquidon Astafieva-Urbajtis, 1994.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC3FFCCFD8F855BFCD7F974.taxon	description	Original source Tornquist (1896): 91 [625], pl. 19 fig. 7; originally as “ Beneckei ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC3FFCCFD8F855BFCD7F974.taxon	materials_examined	Type stratum and age “ [in der] schiefrigen Facies des Kohlenkalks ” (Tornquist 1895: 23) [shaly facies of the Carboniferous Limestone]; middle to upper Visean, Mississippian, Carboniferous (Amler 1987). Type locality “ Hohlweg unterhalb der Ferme [Bauernhof] Pütig ”; along the route from Bourbach-le-Haut to Masevaux, Département Haut-Rhin, France. Type material The whereabouts of the material studied by Tornquist (1896) are unknown. He stated the material as belonging to the “ Geologische Landesanstalt Elsass-Lothringen ”. Amler (1987) stated that the Tornquist collection in the Strasbourg Museum was destroyed in a fire (see also Hubmann 2014).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC3FFCCFD8F855BFCD7F974.taxon	discussion	Remarks Valid as Parallelodon beneckei in Friedel & Amler (2024).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC3FFCDFDD587A5FB9FFDCC.taxon	description	Original source Dickins (1963): 40, pl. 3 figs 6 – 14.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC3FFCDFDD587A5FB9FFDCC.taxon	materials_examined	Type stratum and age “ Fossil Cliff Formation ”; Sakmarian / Artinskian, Cisuralian, Permian. Type locality “ Fossil Ridge, near Holmwood, Irwin River area ”; Irwin River area, eastward of Geraldton, Perth basin, West Australia. Type material Holotype is a LV (UWA Type No. 45352; pl. 3 figs 6 – 8). Several paratypes available: A and B (UWA Type Nos. 45353, 45354, both Reg. No. 23354), C (UWA Type No. 45355, Reg No. 23350), D (UWA Type No. 45356, Reg No. 23388), E (UWA Type No. 45357, Reg No. 23363) and F (CPC 3878, Field No. WB 266). Stored at the Geology Department of the University of Western Australia (UWA) and Geoscience Australia, Commonwealth Palaeontological Collection (CPC).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC2FFCDFD8C83D3FC90FAF1.taxon	description	Original source Bird (1968): 142, pl. 12 figs 10 – 11.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC2FFCDFD8C83D3FC90FAF1.taxon	materials_examined	Type stratum and age “ lower Mercer Limestone ”; Pottsville Formation, Bashkirian to Moscovian, Lower to Middle Pennsylvanian, Carboniferous. Type locality “ Near Somerset ”; Perry Co., Ohio, United States of America. Type material Holotype (pl. 12 fig. 10) and paratype (pl. 12 fig. 11) are BV specimens and stored at the Orton Museum, Ohio State University, coll. no. 9188. Both collected by Morningstar.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC2FFCDFD8C83D3FC90FAF1.taxon	discussion	Remarks Bird (1968) consistently used a feminine ending for all species of Grammatodon, but the gender of the genus is masculine; the correct spelling is biplicatus.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC2FFCDFDE48438FC29F85C.taxon	description	Original source Miller & Gurley (1896): 11, pl. 2 figs 19 – 24.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC2FFCDFDE48438FC29F85C.taxon	materials_examined	Type stratum and age “ Chouteau limestone ”; Kinderhookian, Mississippian, Carboniferous (see Thompson 2001). Type locality “ near Sedalia, Missouri ”, United States of America. Type material Stored at the University of Cincinnati Museum (now Cincinnati Museum Center) with 20 “ cotypes ” under coll. no. 3930 to 3935, coll. Miller (see Chappars 1936).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC2FFCDFDE48438FC29F85C.taxon	discussion	Remarks As Parallelodon blairi in Moore (1928) and Williams (1943).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC1FFCEFDAA8042FE65FC27.taxon	description	Original source Roemer (1860): 6, pl. 2 fig. 13; originally as “ Bodana ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC1FFCEFDAA8042FE65FC27.taxon	materials_examined	Type stratum and age “ Graue Kalke ”, beds with “ Spirifer ” [Cyrtospirifer] disjunctus J. De C. Sowerby in Sedgwick & Murchison, 1840; Givetian or lower Frasnian, Devonian (Amler & Friedel 2025). Type locality Bergfeld bei Elbingerode-Rübeland, Harz Mts, Saxony-Anhalt, Germany. Type material Whereabouts unknown.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC1FFCEFDAA8042FE65FC27.taxon	discussion	Remarks Morphology matches that of species of Parallelodon, but the arrangement of the hinge teeth is unknown (Amler & Friedel 2025).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC1FFCEFD8C828BFD64F993.taxon	description	Original source Reed (1932): 44, pl. 8 fig. 7.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC1FFCEFD8C828BFD64F993.taxon	materials_examined	Type stratum and age “ Agglomeratic slate of Kashmir ”; uppermost Carboniferous to lowermost Permian (Vaidyanadhan & Ramakrishnan 2010; Kumar et al. 2025). Type locality Bren Spur, Srinagar district, Jammu and Kashmir, India. Type material Based on a single specimen (K 24.897), stored at the Geological Survey of India, Kolkata.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC1FFCEFD8C828BFD64F993.taxon	discussion	Remarks Species discussed by Waterhouse (1987: 136).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC1FFCFFDD3871EFDBCFD96.taxon	description	Original source Kayser (1872): 675, pl. 27 fig. 2; originally as “ Brilonensis ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC1FFCFFDD3871EFDBCFD96.taxon	materials_examined	Type stratum and age “ Briloner Eisenstein / Rotheisenstein ”; Stringocephalenkalk (Beushausen 1895), upper Givetian, Middle Devonian. Type locality “ Brilon ”; North Rhine-Westphalia, Germany. Type material Type material (MB. M. 400) is stored at the Museum für Naturkunde, Berlin and is figured in Kayser (1872: pl. 27 fig. 2) and Beushausen (1895: pl. 4 fig. 4).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC1FFCFFDD3871EFDBCFD96.taxon	discussion	Remarks Beushausen (1895: 39, pl. 4 figs 3 – 4) synonymised Pterinea brilonensis Kayser, 1872 with Pholadomya venusta Steininger, 1853 and placed the species in the genus Macrodus. Amler & Friedel (2025) placed the species in Parallelodon.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC0FFCFFDE78319FDC1FACD.taxon	description	Original source Sowerby (1824): 115, pl. 473 fig. 2.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC0FFCFFDE78319FDC1FACD.taxon	materials_examined	Type stratum and age “ Derbyshire Limestone ”; Carboniferous Limestone, Mississippian, Carboniferous. Type locality Derbyshire, United Kingdom. Type material Stored at the Natural History Museum, London, with the coll. no. NHMUK PI OR 43184 (figured in Martin 1809: pl. 44 fig. 7 and Sowerby 1824: pl. 473 fig. 2 and Hind 1897: pl. 10 fig. 7). Sowerby reproduced the specimen as a mirror image.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC0FFCFFDE78319FDC1FACD.taxon	discussion	Remarks The name was already previously mentioned as “ Conchyliolithus Arcites cancellatus ” by Martin (1809). However, that work did not apply the principles of binomial nomenclature and was placed on the Official Index of Rejected and Invalid Works in Zoological Nomenclature by Opinion 231 (ICZN 1954). Sowerby (1824) referred to Martin’s figure, described and illustrated it, and made the name available. Hind (1897) classified the species in Parallelodon.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC0FFC8FE6884DDFC1BFDCF.taxon	description	Original source Martin (1809): unpaginated text, pl. 44 fig. 7; originally as “ Conchyliolithus Arcites (cancellatus) ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC0FFC8FE6884DDFC1BFDCF.taxon	materials_examined	Type stratum and age Martin did not indicate a horizon; Sowerby (1824) gave it as “ Derbyshire Limestone ”; Carboniferous Limestone, Mississippian, Carboniferous. Type locality No specific locality was mentioned by Martin; Sowerby (1824) referred to it as “ Derbyshire Limestone ”, United Kingdom. Type material Stored at the Natural History Museum, London with the coll. no. NHMUK PI OR 43184 (figured in Martin 1809: pl. 44 fig. 7; Sowerby 1824: pl. 473 fig. 2 and Hind 1897: pl. 10 fig. 7). Sowerby reproduced the specimen as a mirror image.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC0FFC8FE6884DDFC1BFDCF.taxon	discussion	Remarks Martin (1809) did not apply the principles of binomial nomenclature and was placed on the Official Index of Rejected and Invalid Works in Zoological Nomenclature by Opinion 231 (ICZN 1954). Sowerby (1824) referred to Martin’s figure, described and illustrated it, and made the name available (as Arca cancellata). Hind (1897) classified the species in Parallelodon.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC7FFC8FDFB83D3FD23FAD2.taxon	description	Original source Mather (1915): 215 [there misspelt as “ Parrallelodon ”], pl. 15 fig. 7.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC7FFC8FDFB83D3FD23FAD2.taxon	materials_examined	Type stratum and age “ Brentwood limestone ”; Brentwood Limestone Member, Bloyd Formation, Bashkirian (Morrowan), Pennsylvanian, Carboniferous (Xie et al. 2018). Type locality “ near Fayetteville, Arkansas (Station 135) ”; the station is further specified on p. 247 as “ Fayetteville quadrangle: Brentwood limestone lentil. Three and a half miles northeast of Fayetteville, Ark. Abandoned quarry. S. 1 / 2, sec. 2, T. 16 N., R. 30 W. ”, United States of America. Type material Holotype (FMNH UC 16062) stored at the Field Museum of Natural History, Chicago (formerly Walker Museum, University of Chicago, as indicated by Mather).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC7FFC8FDFB83D3FD23FAD2.taxon	discussion	Remarks Species discussed in Hoare et al. (1989).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC7FFC8FDEB84DDFE7EF867.taxon	description	Original source Waterhouse (1987): 135, pl. 1 figs 5 – 11.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC7FFC8FDEB84DDFE7EF867.taxon	materials_examined	Type stratum and age “ Brae Formation ”; Roadian, Guadalupian, Permian (Clapham & James 2008). Type locality “ [L 4108]: Bowen Basin of central Queensland ”; south of Cracow, western flank of Pindari Hills, Queensland, Australia. Type material Holotype is a RV (UQF 70214; pl. 1 fig. 11). Additional material is illustrated (UGF 70216, UQF 70217, UQF 70213, UQF 70215). All stored at the Department of Geology and Mineralogy, University of Queensland, Brisbane.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC6FFC9FD928042FB2BFBBE.taxon	description	Original source Cox (1857): 567, pl. 7 [sic, actually pl. 8] fig. 5.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC6FFC9FD928042FB2BFBBE.taxon	materials_examined	Type stratum and age “ limestone over the main coal No. 11, [...] also in a limestone over an equivalent coal ”; Pennsylvanian, Carboniferous (Bird 1968), exact age unknown; the species was later reported as common in the Lower Mercer Member, as well as in the Boggs and Upper Mercer members, of the Lower to Middle Pennsylvanian Pottsville Formation of Ohio (Morningstar 1922; Hoare et al. 1979). Type locality “ Providence, Hopkins county; [...] on the property of Edward and William Hawes, near Hawesville, Hancock county, Kentucky ”, United States of America. Type material Bird (1968) stated that the “ holotype of this species is lost and no topotype material [...] is available. ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC6FFC9FD928042FB2BFBBE.taxon	discussion	Remarks Herrick (1887) placed the species in Macrodon; Mark (1911) recombined the species as Parallelodon carbonarius (see also Hoare et al. 1979); Bird (1968) classified it in Grammatodon.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC6FFC9FDEA8561FCF4F907.taxon	description	Original source Dun & Benson (1920): 353, pl. 21 fig. 7.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC6FFC9FDEA8561FCF4F907.taxon	materials_examined	Type stratum and age “ Lower Carboniferous (Burindi) ”; probably correlated to the Visean, Mississippian, Carboniferous (see Dun & Benson 1920: 371). Type locality “ south-eastern portion of Babbinboon ”; Babbinboon Mt near Tamworth, New South Wales, Australia. Type material Based on a steinkern with a fragement of shell material. Collection not mentioned, but the authors stored material for several other species in the collection of the Geological Survey of New South Wales.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC6FFC9FDEA8561FCF4F907.taxon	discussion	Remarks Not found in the literature after the original description.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC6FFCAFEF087AAFCFAFE59.taxon	description	Original source Astafieva-Urbajtis & Ramovš (1985): 15, pl. 1 fig. 7.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC6FFCAFEF087AAFCFAFE59.taxon	materials_examined	Type stratum and age “ verkhniy karbon, gzhel’skiy yarus ”; Auernig Formation, Gzhelian, Carboniferous. Type locality “ Yugoslaviya, gory Karavanke [...] Križovec 1 (Črni vrh) ”, Karavanke Mts, Slovenia. Type material Type material is stored at the Gornjesavski muzej Jesenice, Slovenia, formerly Technical Museum of zelezarne Jesenica. Holotype with coll. no. USMJ 884.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC5FFCAFF088340FEABFB5F.taxon	description	Original source Yang et al. (2016): 105, text-fig. 3 g – k.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC5FFCAFF088340FEABFB5F.taxon	materials_examined	Type stratum and age Talung Formation, upper Changhsingian, Lopingian, Permian. Type locality “ Dongpan section, near Dongpan Village, Liuqiao Town, Fusui County, Guangxi Zhuang Autonomous Region ”; near the exit along road S 60 to route G 322, southeast of Chongzuo, China. Type material Holotype is a RV (DP 8051; text-fig. 3 g). One paratype is mentioned (LV; DP 1056; text-fig. 3 h). Stored at the School of Earth Sciences, China University of Geosciences, Wuhan, China.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC5FFCAFF088340FEABFB5F.taxon	discussion	Remarks Note that the original work first appeared online in November 2015 but without a ZooBank registration (compare ICZN 1999, Art. 8.5.3). Therefore, the new species is available only from the printed version (2016).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC5FFCBFE3E8442FE2DFEC9.taxon	description	Original source Hall & Whitfield (1869): 14.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC5FFCBFE3E8442FE2DFEC9.taxon	materials_examined	Type stratum and age “ Chemung group ”; Upper Devonian (Brallier Formation and Jennings Formation; Amler & Friedel 2025). Type locality “ Philipsburgh and Rockville, Alleghany county; at Chemung creek in Chemung county, at Leon in Cattaraugus county, and near Elmira (New-York), and also at Meadville in Pennsylvania ”, United States of America. Type material Syntypes (AMNH-FI- 6556, FI- 41953, FI- 41954, FI- 41955 (formerly 6132 / 1 to 6132 / 5 )) are stored at the American Museum of Natural History, New York. McAlester (1962: 25, pl. 4 figs 1 – 2) designated the specimen illustrated by Hall (1885: pl. 51 fig. 14; AMNH-FI- 41953 / 41954 (formerly 6132 / 1 )) as the “ holotype ”, which however does not qualify for a valid lectotype designation (ICZN 1999, Art. 74.5).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC5FFCBFE3E8442FE2DFEC9.taxon	discussion	Remarks McAlester (1962: 25) classified the species in Grammatodon (Cosmetodon); Linsley (1994) listed it as Gramatodon [sic].	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC4FFCBFD85854CFB3CF92A.taxon	description	Original source McCoy (1844): 72, pl. 11 fig. 34.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC4FFCBFD85854CFB3CF92A.taxon	materials_examined	Type stratum and age Middle Limestone or Calp Series (Griffith in McCoy 1862); probably Benbulben Shale Formation of the Tyrone Group, Arundian – Asbian, Visean, Mississippian, Carboniferous. Type locality “ Finner, Bundoran ”, County Donegal (Griffith in McCoy 1862), Ireland. Type material Syntypes probably lost (Hind 1897: 144, 174). Should have been stored at the National Museum of Ireland, Dublin as a part of coll. Griffith.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC4FFCBFD85854CFB3CF92A.taxon	discussion	Remarks Hüffner (1915) and Amler (1987) attributed the species to the genus Parallelodon.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC4FFCBFDF480D0FEC0FC62.taxon	description	Original source Chao (1927): 7, pl. 1 fig. 10 a – b.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC4FFCBFDF480D0FEC0FC62.taxon	materials_examined	Type stratum and age “ Spirifer taiyuanensis zone, Houkou limestone, Lincheng coal field ”; Houkou limestone, Taiyuan Formation, upper Carboniferous to lower Permian (Fang et al. 2009). Type locality “ Lincheng coal field, S. Chihli ([...] Loc. 158) ”; Lincheng County, Xingtai, Hebei, China. Type material Holotype is a RV (no. 1216, pl. 1 fig. 10). Two additional specimens (without number) mentioned by the author. All stored at the Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, China.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC4FFC4FDF787F5FB50FD8C.taxon	description	Original source Winchell (1863): 16.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC4FFC4FDF787F5FB50FD8C.taxon	materials_examined	Type stratum and age “ Yellow Sandstone beneath Burlington Limestone ”; Osagean, Tournaisian – Visean, Mississippian, Carboniferous (Thompson 2001). Type locality “ Burlington, Iowa ”, United States of America. Type material Not traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC4FFC4FDF787F5FB50FD8C.taxon	discussion	Remarks Classified in Parallelodon by Moore (1928: 28) and in Grammatodon by Paul (1941: 114).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCBFFC4FDFF8588FB97F8EE.taxon	description	Original source Gemmellaro (1892): 6.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCBFFC4FDFF8588FB97F8EE.taxon	materials_examined	Type stratum and age “ Calcare grossolano con Fusulina ”; Wordian to upper Permian (Sanfilippo et al. 2017). Type locality “ Pietra di Salomone ”; 3 km southern of Palazzo Adriano, Palermo, Italy. Type material Gemmellaro did not designate types. He mentioned measurements of three specimens, but only the two figured syntypes are stored at the Museo Geologico Università Palermo, Italy (MGUP- 001.264 a and b).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCBFFC4FDFF8588FB97F8EE.taxon	discussion	Remarks Only briefly described in Gemmellaro (1892: 6); extended description and illustration in Gemmellaro (1896: 24, pl. 23 figs 4 – 5). Listed as Parallelodon by Branson (1948: 649).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCBFFC4FDEB8313FD82FB21.taxon	description	Original source De Koninck (1885): 159, pl. 24 figs 52 – 53.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCBFFC4FDEB8313FD82FB21.taxon	materials_examined	Type stratum and age “ calcaire carbonifère de Visé (étage III) ”; V 3 b and V 3 c, Visean, Mississippian, Carboniferous (Demanet 1958: 29; Godefroid et al. 2006). Type locality “ Visé ”; quarries south of Visé, on the east side of the Meuse River valley (Demanet 1958; Godefroid et al. 2006), Belgium. Type material The figured syntype is stored at the Royal Belgian Institute of Natural Sciences, Brussels (RBINS a 4720; old no. 1053; coll. de Ryckholt).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCAFFC5FD938043FCF6FC5D.taxon	description	Original source McCoy (1844): 74, pl. 11 fig. 28.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCAFFC5FD938043FCF6FC5D.taxon	materials_examined	Type stratum and age Arenaceous Limestone of Yellow Sandstone Group (Griffith in McCoy 1862); Dinantian (TournaisianVisean), Mississippian, Carboniferous. Type locality “ Townparks, Killeshandra ”, County Cavan (Griffith in McCoy 1862), Ireland. Type material Lectotype (designated by Hind 1897, as “ the type ”; NMING: F 7359) figured by McCoy (1844: pl. 11 fig. 28) and Hind (1897: 153, pl. 12 fig. 16). Stored at the National Museum of Ireland, Dublin as part of the Griffith collection.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCAFFC5FD938043FCF6FC5D.taxon	discussion	Remarks Hind (1897: 153) synonymised M. concinna and A. fimbriata McCoy, 1844 with a question mark and used the name Parallelodon concinnus for both species.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCAFFC5FDF7854CFC62F906.taxon	description	Original source Cox (1946): 612, pl. 13 fig. 4.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCAFFC5FDF7854CFC62F906.taxon	materials_examined	Type stratum and age “ Sekondi Series (Upper Palaeozoic) ”; original collection label states “ Devono-Carboniferous Sekondi Series ”; Takoradi Sandstones and Takoradi Shales, Lower Devonian to lower Carboniferous (Machens 1973). Type locality Accra, west of Cape Coast and 45 miles from Cape Coast to beyond Takoradi; Sekondi-Takoradi, Ghana. Type material Holotype (as the only specimen) is a RV stored at the Natural History Museum, London (NHMUK PI PL 485; positiv and negativ).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCAFFC5FDF7854CFC62F906.taxon	discussion	Remarks Further mentioned by Machens (1973) and Amler & Friedel (2025).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCAFFC6FDDD87AAFD29FD27.taxon	description	Original source De Koninck (1885): 160, pl. 25 figs 1 – 2.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCAFFC6FDDD87AAFD29FD27.taxon	materials_examined	Type stratum and age “ calcaire carbonifère de Visé (étage III) ”; V 3 b and V 3 c, Visean, Mississippian, Carboniferous (Demanet 1958: 29; Godefroid et al. 2006). Type locality “ Visé ”; quarries south of Visé, on the east side of the Meuse River valley (Demanet 1958; Godefroid et al. 2006), Belgium. Type material The illustrated syntype is stored at the Royal Belgian Institute of Natural Sciences, Brussels (RBINS a 4723; old no. 1159; coll. de Ryckholt).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC9FFC6FD8F838AFE0CFAC8.taxon	description	Original source Barrois (1882): 337, pl. 17 fig. 1 a – b.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC9FFC6FD8F838AFE0CFAC8.taxon	materials_examined	Type stratum and age “ Assise de la Leña ”; probably Namurian (Serpukhovian, Mississippian to Bashkirian, Pennsylvanian), Carboniferous (Malvesy et al. 2000). Type locality “ Sebarga, Pont de Demues ”; Sebarga and Pont de Demuès (not found, but according to Barrois 1882: 537, 15 km E of Demuès), Asturias, Spain. Type material Holotype is a LV (MGL 4864) and stored at Musée d’Histoire naturelle de Lille (Malvesy et al. 2000).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC9FFC6FD8F838AFE0CFAC8.taxon	discussion	Remarks As “ Parallelodon (Carbonarca) Cortazari ” in De Koninck (1885: 142); not found discussed in the literature afterwards.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC9FFC7FDDD84D6FDB2FEC9.taxon	description	Original source McCoy (1844): 72, pl. 11 fig. 36.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC9FFC7FDDD84D6FDB2FEC9.taxon	materials_examined	Type stratum and age Upper Limestone of Limestone Group (Griffith in McCoy 1862); probably Dartry Limestone Formation of the Tyrone Group (Asbian, Visean, Mississippian, Carboniferous). Type locality “ Black Lion, Enniskillen ”, County Leitrim (Griffith in McCoy 1862), Ireland. Type material The figured specimen is lost (Hind 1897: 146). It should have been stored at the National Museum of Ireland, Dublin, as part of the Griffith collection. Another syntype (NMING, coll. no. F 7309) is available there.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC9FFC7FDDD84D6FDB2FEC9.taxon	discussion	Remarks Considered a junior synonym of Parallelodon cancellatus “ (Martin, 1809) ” [actually (J. De C. Sowerby, 1824)] by Hind (1897: 144).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC8FFC7FDE98518FB77F959.taxon	description	Original source Dawson (1868): 302.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC8FFC7FDE98518FB77F959.taxon	materials_examined	Type stratum and age “ bed (e) ”, on p. 280 further specified as “ Stewiacke limestone [...], Productus Limestone ”; part of the Windsor Group (middle – upper Visean, Mississippian, Carboniferous according to Utting (1978) and Calder (1998). Type locality “ Windsor ”; Nova Scotia, Canada. Type material The whereabouts of the material are unknown.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC8FFC7FDE98518FB77F959.taxon	discussion	Remarks Bell (1929: 156) synonymised M. curtus with Parallelidon [sic] hardingi Dawson, 1868.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC8FFC7FDC380D0FAF5FB91.taxon	description	Original source De Koninck (1885): 145, pl. 21 figs 10 – 12.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC8FFC7FDC380D0FAF5FB91.taxon	materials_examined	Type stratum and age “ calcaire carbonifère des Pauquys (étage II) ”; Waulsort Formation, upper Tournaisian, Mississippian, Carboniferous. Type locality “ Pauquys ”; Hastière, Namur, Wallonia, Belgium. Type material The illustrated syntype is stored at the Royal Belgian Institute of Natural Sciences, Brussels, coll. no. RBINS a 4664 (coll. de Ryckholt).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC8FFC7FDC380D0FAF5FB91.taxon	discussion	Remarks Questionable synonym of Parallelodon haimeanus (De Koninck, 1851) according to Amler (1987).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC8FFC0FE068640FC4CFDE9.taxon	description	Original source Ding et al. (1982): 313, pl. 123 fig. 7.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFC8FFC0FE068640FC4CFDE9.taxon	materials_examined	Type stratum and age Changhsingian, Lopingian, Permian. Type locality Huangkeng, Datian County, Fujian, China. Type material The figured holotype is a steinkern of a RV (HI- 2549). The storage is unknown. Probably Nanjing Institute of Geology and Paleontology, Chinese Academy of Sciences.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCFFFC0FDE48330FD50FA01.taxon	description	Original source Beede (1911): 168, unnumbered text-fig. on p. 168.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCFFFC0FDE48330FD50FA01.taxon	materials_examined	Type stratum and age “ Carbonic (Mississippic); ferruginous magnesian limestone ” (probably Windsor Group; middle to upper Visean, Mississippian, Carboniferous according to Utting 1978) and “ bed (e) ” / “ Stewiacke limestone [...], Productus Limestone ” (part of the Windsor Group; see also M. hardingi). Type locality “ Magdalen Island, Grindstone Island, Cape le Trou at the west coast ”; Les Îles-de-la-Madeleine, Quebec, and “ Windsor ”; Nova Scotia, Canada. Type material In addition to material from Grindstone Island, Beede selected one of the two specimens of M. hardingi of Dawson (1868: text-fig. 102 b on p. 302) as belonging to this new species. He did not select a type. The material of Dawson (1868) is stored at the Redpath Museum of the McGill University, under coll. no. 2820. The whereabouts of Beede’s remaining material are unknown.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCFFFC0FDE48330FD50FA01.taxon	discussion	Remarks Also listed by Bell (1929) and Calder (1998), who also adopted the spelling error of the genus. Listed by Paul (1941: 115) as Grammatodon dawsoni.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCFFFC1FD9184A8FC49FDF3.taxon	description	Original source von Koenen (1879): 337.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCFFFC1FD9184A8FC49FDF3.taxon	materials_examined	Type stratum and age Bromberg Formation (also called “ Formation der Kieseligen Übergangsschichten ”); upper Asbian, Mississippian, Carboniferous. Type locality Weinberg (also known as “ Geistlicher Berg ”), northern periphery of Herborn, Hesse, Germany. Type material Von Koenen (1879) did not provide a precise list of specimens. He mentioned several specimens from Herborn, but only one specimen has been found (GZG. INV. 2420; formerly 563 - 47); it was designated as the lectotype by Friedel & Amler (2024: fig. 5 a). The whereabouts of the remaining syntypes from Herborn are unknown. In addition, a paralectotype from Nehden (GZG. INV. 10322) is available; figured by Friedel & Amler (2024: fig. 5 e – f). Lectotype and paralectotype stored at the GeoZentrum Göttingen.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCFFFC1FD9184A8FC49FDF3.taxon	discussion	Remarks Recently revised as Parallelodon decheni by Friedel & Amler (2024).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCEFFC1FDD8841BFCBFF800.taxon	description	Original source Meek & Worthen (1870): 40.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCEFFC1FDD8841BFCBFF800.taxon	materials_examined	Type stratum and age “ Upper Coal Measures ” (= Pennsylvanian), Carboniferous. Type locality “ Springfield, Illinois ”, United States of America. Type material Not traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCEFFC1FDD8841BFCBFF800.taxon	discussion	Remarks Occurs in a species list in Savage (1924); mentioned as Grammatodon in Demanet (1941); listed and illustrated as Parallelodon by Hoare et al. (1979).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCEFFC1FD8A833EFEE8FA94.taxon	description	Original source McCoy (1844): 53, pl. 10 fig. 2.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCEFFC1FD8A833EFEE8FA94.taxon	materials_examined	Type stratum and age Lower Limestone of Limestone Group (Griffith in McCoy 1862); probably Ballyshannon Limestone Formation of the Tyrone Group, Chadian – Arundian, Visean, Mississippian, Carboniferous. Type locality “ Little Island, Cork ”, County Cork (Griffith in McCoy 1862), Ireland. Type material Lectotype (designated by Hind 1897, as “ the type ”): NMING: F 7260 (Griffith coll.). Also figured by Hind (1897: 159, pl. 11 fig. 22). Stored at the National Museum of Ireland, Dublin.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCEFFC1FD8A833EFEE8FA94.taxon	discussion	Remarks De Koninck (1885) attributed the species to the genus Parallelodon, which was followed by Amler (1987: 170).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCDFFC2FDC0829FFEC0F920.taxon	description	Original source Meek & Worthen (1870): 40.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCDFFC2FDC0829FFEC0F920.taxon	materials_examined	Type stratum and age “ Upper Coal Measures ” (= Pennsylvanian), Carboniferous. Type locality “ Lasalle, Ill. ” [Lasalle, Illinois], United States of America. Type material Not traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCDFFC2FDC0829FFEC0F920.taxon	discussion	Remarks Introduced conditionally for specimens of Carbonarca gibbosa Meek & Worthen, 1870 that are “ more depressed and oblique than the typical form. ” The authors stated further: “ these may possibly belong a to a distinct species if the differences noted are not due to accidental distortion. If really distinct, this form might be called C. depressa ”. Only mentioned in the PhD thesis of Griffin (1931); not found elsewhere in the literature.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCDFFC2FDE38043FD96FC12.taxon	description	Original source Beushausen (1895): 41, pl. 4 fig. 5.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCDFFC2FDE38043FD96FC12.taxon	materials_examined	Type stratum and age “ Stringocephalenkalke ”; upper Givetian, Middle Devonian. Type locality “ Soetenich ”; Sötenich near Kall, Euskirchen, North Rhine-Westphalia, Germany. Type material The species was based on one LV (MB. M. 75), which was destroyed and is only preserved in small fragments at the Museum für Naturkunde, Berlin.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCDFFC2FDE38043FD96FC12.taxon	discussion	Remarks Additional material from the “ Unterer Plattenkalk ” (upper Givetian) from Bergisch Gladbach (Bergisches Land, Germany) is also stored in the Ebbighausen coll. (MB. M. 21252) at the Museum für Naturkunde, Berlin (Amler & Friedel 2025).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCDFFC3FD8E8789FC5EFDB5.taxon	description	Original source Hyde (1953): 299.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCDFFC3FD8E8789FC5EFDB5.taxon	materials_examined	Type stratum and age “ sandstone in the Allensville member of the Logan formation ”; earliest Osagean (upper Tournaisian), Mississippian, Carboniferous (Matchen & Kammer 2006). Type locality Rushville, Ohio, United States of America. Type material Specimens are stored at Ohio State University, O. S. U. No. 19671. Driscoll (1965: 100, pl. 16 figs 4 – 5) figured the holotype and paratype and synonymised the species with P. marshallensis (Winchell, 1862). He considered the other specimens as not belonging to Parallelodon.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCCFFC3FDEC8365FE14FB91.taxon	description	Original source Fantini Sestini (1965): 144, pl. 20 figs 9 – 10.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCCFFC3FDEC8365FE14FB91.taxon	materials_examined	Type stratum and age “ Gircha Formation, Lower Permian ”; Lupghar Formation, Sakmarian, Permian. Type locality “ Abgarch Valley, east of Mor Khun ”; Abgarch, Gilgit-Baltistan, Pakistan. Type material Holotype is a LV (P 1780), one additional specimen mentioned. All stored at the Paleontology Institute of Milan University.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCCFFC3FDEF8518FDFCF829.taxon	description	Original source Waterhouse (1980): 103; figured by Dickins (1963: pl. 3 figs 1 – 5) as P. subtilistriatus.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCCFFC3FDEF8518FDFCF829.taxon	materials_examined	Type stratum and age “ Lower Liveringa Formation ”; given as Kungurian (Cisuralian, Permian) by Waterhouse, but Mii et al. (2013) classify the Liveringa Group in the Guadalupian – Lopingian, Permian. Type locality “ Mt Marmion, Western Australia ”; Fitzroy Basin, western Kimberley, Australia. Type material Holotype is a LV (CPC [“ CDC ”] 45359, according to Waterhouse 1980; UWA 45359, according to Dickins 1956), figured by Dickins (1963: pl. 3 figs 2 – 3) as P. subtilistriatus Wanner, 1922. Further material is a RV (UWA 45358) and a LV (UWA 45360). Holotype stored at the Commonwealth Palaeontological Collection of Geoscience Australia (CPC), formerly at the Geology Department of the University of Western Australia (UWA). However, the specimen is not listed in the CPC collection catalogue of Strusz (1996).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFCCFFC3FDEF8518FDFCF829.taxon	discussion	Remarks Waterhouse introduced the species based on six specimens that had been misidentified as P. subtilistriatus Wanner, 1922 by Dickins (1963).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF3FFFCFDD78238FB03FA5C.taxon	description	Original source Amalitsky (1886): 50, pl. 1 figs 17 – 18; originally as Dokutschajewi.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF3FFFCFDD78238FB03FA5C.taxon	materials_examined	Type stratum and age Tatarian (Capitanian to Lopingian), Permian (Maslennikov 1935: 40). Type locality “ u Chubalova ” [near Chubalovo]; S of Gorbatov along the Oka River, Nizhny Novgorod Oblast, Volga-Oka Basin, Russia. Type material Not traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF3FFFCFDD78238FB03FA5C.taxon	discussion	Remarks Listed by Netschajew (1894: 84) and, as Parallelodon, by Maslennikov (1935: 12, 40).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF3FFFCFDEF8043FC6AFCF1.taxon	description	Original source De Koninck (1885): 160, pl. 24 figs 46 – 47.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF3FFFCFDEF8043FC6AFCF1.taxon	materials_examined	Type stratum and age “ calcaire carbonifère de Visé (étage III) ”; V 3 b and V 3 c, Visean, Mississippian, Carboniferous (Demanet 1958: 29; Godefroid et al. 2006). Type locality “ Visé ”; quarries south of Visé, on the east side of the Meuse River valley (Demanet 1958; Godefroid et al. 2006), Belgium. Type material The illustrated syntype is inventoried at the Royal Belgian Institute of Natural Sciences, Brussels (RBINS a 4722), but the specimen could not be found and is potentially lost.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF3FFFDFDEE8743FC85FD96.taxon	description	Original source De Koninck (1842): 117, pl. 3 fig. 3 a – b.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF3FFFDFDEE8743FC85FD96.taxon	materials_examined	Type stratum and age “ calcaire de montagne de Visé ”; V 3 b and V 3 c, Visean, Mississippian, Carboniferous (Demanet 1958: 29; Godefroid et al. 2006). Type locality “ Visé ”; quarries south of Visé, on the east side of the Meuse River valley (Demanet 1958; Godefroid et al. 2006), Belgium. Type material The material of De Koninck (1842 – 1844) is stored in the collection of the Géologie de l’Université Lyon, but the syntypes of this species could not be found there.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF3FFFDFDEE8743FC85FD96.taxon	discussion	Remarks De Koninck mentioned that he only had a damaged specimen of this species. Junior homonym of Arca elegans Roemer, 1836; Arca elegantula De Koninck, 1844 (p. 634) is a replacement name; valid as Cypricardinia elegantula. See there for further details.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF2FFFDFD818319FD38FAF1.taxon	description	Original source De Koninck (1844): 634.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF2FFFDFD818319FD38FAF1.taxon	materials_examined	Type stratum and age “ calcaire de montagne de Visé ”; V 3 b and V 3 c, Visean, Mississippian, Carboniferous (Demanet 1958: 29; Godefroid et al. 2006). Type locality “ Visé ”; quarries south of Visé, on the east side of the Meuse River valley (Demanet 1958; Godefroid et al. 2006), Belgium. Type material The material of De Koninck (1842 – 1844) is stored in the collection of the Géologie de l’Université Lyon, but the syntypes of this species could not be found there.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF2FFFDFD818319FD38FAF1.taxon	discussion	Remarks Replacement name for Arca elegans De Koninck, 1842 (p. 117, pl. 2 fig. 3 a – b), non Arca elegans Roemer, 1836. De Koninck (1885) attributed the species to Parallelodon. Today valid as Cypricardinia elegantula according to Amler (1987).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF2FFFDFE8C8438FB50F8CC.taxon	description	Original source Astafieva-Urbajtis & Ramovš (1985): 11, pl. 1 fig. 8.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF2FFFDFE8C8438FB50F8CC.taxon	materials_examined	Type stratum and age “ verkhniy karbon, gzhel’skiy yarus ”; Auernig Formation, Gzhelian, Carboniferous. Type locality “ Yugoslaviya, gory Karavanke [...] Križovec 1 (Črni vrh) ”, Karavanke Mts, Slovenia. Type material Type material is stored at the Gornjesavski muzej Jesenice, Slovenia, formerly Technical Museum of zelezarne Jesenica. Holotype is a steinkern of a BV specimen with the coll. no. USMJ 885.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF1FFFEFDDA8238FDA5F909.taxon	description	Original source Hind (1904): 138, pl. 24 fig. 16.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF1FFFEFDDA8238FDA5F909.taxon	materials_examined	Type stratum and age “ Knipe Scar Limestone ”; Great Knipe Scar Limestone Group, Asbian, Visean, Mississippian, Carboniferous. Type locality “ Shap, Westmoreland ”; Cumbria, United Kingdom. Type material The figured specimen is a steinkern of a LV and stored at the Natural History Museum, London (NHMUK PI L 47736; coll. Hind).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF1FFFEFDDA8238FDA5F909.taxon	discussion	Remarks Junior homonym of Parallelodon elongatus Yanishevsky, 1900, a Carboniferous species from Russia, and secondary homonym of Macrodon [= Parallelodon] elongatus Bittner, 1901, a Triassic species from Hungary (see also ICZN 1999, Art. 57.3.2.). Also, a potential, secondary homonym of Cucullaea elongata J. De C. Sowerby, 1824, which was placed in Parallelodon by some authors (e. g., Kunz 1964). Currently, the species is classified in Grammatodon (Cosmetodon) according to Fürsich et al. (2019). A replacement name is required.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF1FFFEFDD08043FE22FCF0.taxon	description	Original source Yanishevsky (1900): 222, pl. 4 fig. 2.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF1FFFEFDD08043FE22FCF0.taxon	materials_examined	Type stratum and age Astafieva-Urbajtis Astafieva-Urbajtis & Ramovš (1985) indicated a Baskhirian (Pennsylvanian, Carboniferous) age, while Mychko et al. (2025), based on a wider assessment of the area, attributed strata around the type locality to the Visean (Mississippian) to Bashkirian (Pennsylvanian), Carboniferous. Type locality Shartymka River, ca 8 km SE of Polyakovka, Bashkortostan Republic, Russia. Type material Type material (KP 426 / 450) is stored at the A. A. Shtukenberg Geological Museum of Kazan Federal University, Kazan.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF1FFFFFDE68790FD59FC06.taxon	description	Original source Bird (1968): 138, pl. 12 figs 12 – 13, 14 a – b.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF1FFFFFDE68790FD59FC06.taxon	materials_examined	Type stratum and age “ Bed ten of Gaptank Formation ”; Upper Pennsylvanian, Carboniferous according to Wardlaw & Nestell (2019). Type locality “ [USNM] locality 700 a – same as locality 700 [2 miles S. 17 ° E. of Gaptank, 1 1 / 4 miles E. of a point on the Fort Stockton road 2 miles S. of Gaptank, about 23 1 / 2 miles NE of Marathon, Texas] but 1 / 4 mile E. in a small canyon ”, United States of America. Type material Holotype is a BV specimen (USNM PAL 155833; pl. 12 fig. 14 a – b). Paratypes are a RV (USNM PAL 155834; pl. 12 fig. 12) and a LV (USNM PAL 155852; pl. 12 fig. 13). All stored at the Smithsonian National Museum of Natural History, Paleobiology Collection, Washington, D. C.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF1FFFFFDE68790FD59FC06.taxon	discussion	Remarks Bird (1968) consistently used a feminine ending for all species of Grammatodon, but the gender of the genus is masculine. The species is named after its “ erect broad umbones ” (Bird 1968: 138), however the epithet is not formed following Latin grammar; in case of doubt a species name is to be considered a noun in apposition (ICZN 1999, Art. 31.2.2).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF0FFFFFDE282AAFDA2F998.taxon	description	Original source De Koninck (1885): 153, pl. 26 fig. 16.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF0FFFFFDE282AAFDA2F998.taxon	materials_examined	Type stratum and age “ calcaire carbonifère de Visé (étage III) ”; V 3 b and V 3 c, Visean, Mississippian, Carboniferous (Demanet 1958: 29; Godefroid et al. 2006). Type locality “ Visé ”; quarries south of Visé, on the east side of the Meuse River valley (Demanet 1958; Godefroid et al. 2006), Belgium. Type material The illustrated syntype is stored at the Royal Belgian Institute of Natural Sciences, Brussels, coll. no. RBINS a 4698 (old no. 1046).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF0FFF8FDEB8707FC5BFDF3.taxon	description	Original source De Koninck (1885): 144 [as P. dilatatus], 260 (Corrections), pl. 21 figs 13 – 15, 22 – 23 [as P. expansus].	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF0FFF8FDEB8707FC5BFDF3.taxon	materials_examined	Type stratum and age “ calcaire carbonifère des Pauquys (étage II) ”; Waulsort Formation, upper Tournaisian, Mississippian, Carboniferous. Type locality “ Pauquys ”; Hastière, Namur, Wallonia, Belgium. Type material The illustrated syntypes are stored at the Royal Belgian Institute of Natural Sciences, Brussels, coll. no. RBINS a 4660 (old no. 691; pl. 21 figs 13 – 15) and coll. no. RBINS a 4661 (old. no. 678; pl. 21 figs 22 – 23).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF0FFF8FDEB8707FC5BFDF3.taxon	discussion	Remarks De Koninck (1885) erected two species with the same name (dilatatus) and renamed one of them in the Corrections (p. 260) as P. expansus. The name dilatatus on p. 144 is therefore an incorrect original spelling and not a separately available name (ICZN 1999, Art. 32.4).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF7FFF8FDA5833EFE46FA64.taxon	description	Original source De Koninck (1842): 115, pl. 2 fig. 17 a – d [sic, actually fig. 17 a – c]; originally as “ Faba ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF7FFF8FDA5833EFE46FA64.taxon	materials_examined	Type stratum and age “ calcaire anthraxifère supérieur de Visé ” specified as “ calcaire carbonifère de Visé (étage III) ” by De Koninck (1885); V 3 b and V 3 c, Visean, Mississippian, Carboniferous (Demanet 1958: 29; Godefroid et al. 2006). Type locality “ Visé ”; quarries south of Visé, on the east side of the Meuse River valley (Demanet 1958; Godefroid et al. 2006), Belgium. Type material The material of De Koninck (1842) is stored in the collection of the Géologie de l’Université Lyon, but the specimen stored there as the illustrated syntype (UCBL-EM 35411) does not match the figures. De Koninck illustrated a BV specimen and a RV, the material stored in Lyon is a damaged LV. Additional material (RBINS a 4687, RBINS a 4688, RBINS a 4689) of De Koninck (1885) is stored at the Royal Belgian Institute of Natural Sciences, Brussels.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF7FFF8FDA5833EFE46FA64.taxon	discussion	Remarks De Koninck (1885) placed this species in Parallelodon; the species name is a noun in apposition and does not change its ending.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF7FFF9FDEE874BFD13FE59.taxon	description	Original source Miller & Gurley (1896): 10, pl. 1 figs 14 – 16.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF7FFF9FDEE874BFD13FE59.taxon	materials_examined	Type stratum and age “ Chouteau limestone ”; Kinderhookian, Mississippian, Carboniferous (see Thompson 2001). Type locality “ near Sedalia, Missouri ”, United States of America. Type material Stored at the University of Cincinnati Museum (now Cincinnati Museum Center) with six “ cotypes ” under coll. no. 3905 – 3906, coll. Miller (see Chappars 1936).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF7FFF9FDEE874BFD13FE59.taxon	discussion	Remarks As Parallelodon facetus in Moore (1928).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF6FFF9FDAD8347FC79FB7D.taxon	description	Original source De Koninck (1851): 672 [22], pl. 57 fig. 6 a – c, in the plate caption as “ Arca (Cucullaea) fallax ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF6FFF9FDAD8347FC79FB7D.taxon	materials_examined	Type stratum and age “ calcaire carbonifère inférieur de Visé ”; V 3 b and V 3 c, Visean, Mississippian, Carboniferous (Demanet 1958: 29; Godefroid et al. 2006). Type locality “ Visé ”; quarries south of Visé, on the east side of the Meuse River valley (Demanet 1958; Godefroid et al. 2006), Belgium. Type material Whereabouts unknown. Additional material (RBINS a 4696, RBINS a 4697) of De Koninck (1885) is stored at the Royal Belgian Institute of Natural Sciences, Brussels.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF6FFF9FDAD8347FC79FB7D.taxon	discussion	Remarks De Koninck (1885) placed this species in the genus Parallelodon.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF6FFFAFDD085ADFBB8FE69.taxon	description	Original source De Koninck (1844): 634 (121, pl. 2 fig. 13 as A. squamosa).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF6FFFAFDD085ADFBB8FE69.taxon	materials_examined	Type stratum and age “ calcaire de Visé ”; V 3 b and V 3 c, Visean, Mississippian, Carboniferous (Demanet 1958: 29; Godefroid et al. 2006). Type locality “ Visé ”; quarries south of Visé, on the east side of the Meuse River valley (Demanet 1958; Godefroid et al. 2006), Belgium. Type material The illustrated syntypes are stored in the collection of the Géologie de l’Université Lyon. Syntype UCBL-EM 35397 (figured) is a BV specimen; three further BV specimens are available (UCBL-EM 35398 to 35400).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF6FFFAFDD085ADFBB8FE69.taxon	discussion	Remarks Replacement name for Arca squamosa De Koninck, 1842 (p. 121, pl. 2 fig. 13) introduced by De Koninck himself in the correction part of the same book (livr. 14: 634). However, fimbriata is a junior homonym of Arca fimbriata McCoy, 1844 and thus invalid as well. McCoy’s work was published in October 1844 (Wyse Jackson & Monaghan 1994), the last parts of De Koninck’s book supposedly in December of the same year (Sherborn 1922). However, there is still uncertainty as to the exact publication dates of the individual parts of De Koninck’s monograph. McCoy even referred to De Koninck’s work in the preface, but only mentioned livr. 1 – 12, supporting the notion that livr. 14 with the replacement name appeared later. Consequently, De Koninck’s species is still without a valid name.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF5FFFAFDF380B1FA81FB13.taxon	description	Original source McCoy (1844): 71, pl. 12 fig. 8.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF5FFFAFDF380B1FA81FB13.taxon	materials_examined	Type stratum and age Lower Limestone of Limestone Group (Griffith in McCoy 1862); probably Ballyshannon Limestone Formation of the Tyrone Group, Chadian – Arundian, Visean, Mississippian, Carboniferous. Type locality “ Ballyduff, Dungarven ”, County Waterford (Griffith in McCoy 1862), Ireland. Type material The syntype (NMING: F 5139) is badly preserved. We doubt that this is the specimen illustrated by McCoy. It is stored in the Griffith coll. of the National Museum of Ireland, Dublin.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF5FFFAFDF380B1FA81FB13.taxon	discussion	Remarks Senior homonym of Arca fimbriata De Koninck, 1844. Hind (1897: 153) synonymised A. fimbriata with a question mark with M. concinna McCoy, 1844 and used the name P. concinnus for both species.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF5FFFAFDCE859EFD19F872.taxon	description	Original source Campbell & Engel (1963): 103, pl. 7 figs 18 – 24.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF5FFFAFDCE859EFD19F872.taxon	materials_examined	Type stratum and age Limestone at the top of the Tulcumba Sandstone, today Dangarfield Formation, Tournaisian, Carboniferous. Type locality North of the Wean-Manilla Road, north-east of Rangari Homestead, Rangari Area, New South Wales, Australia. Type material Holotype (F. 7603) and paratypes (F. 7604 to 7629) from the type locality, and one paratype (F. 7630) from Swain’s Gully, Merlewood (ca 20 miles south of the type locality). All stored at the University of New England Collection, Maine.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF5FFFAFDCE859EFD19F872.taxon	discussion	Remarks Yoo (1988: 238, figs 126 – 127) placed the species in the genus Parallelodon, yet without discussion; the species is not found discussed elsewhere.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF4FFFBFDE88043FE67FBBF.taxon	description	Original source De Koninck (1885): 146, pl. 24 figs 3, 24, pl. 25 fig. 23.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF4FFFBFDE88043FE67FBBF.taxon	materials_examined	Type stratum and age “ calcaire carbonifère de Visé (étage III) ”; V 3 b and V 3 c, Visean, Mississippian, Carboniferous (Demanet 1958; Godefroid et al. 2006). Type locality “ Visé ”; quarries south of Visé, on the east side of the Meuse River valley (Demanet 1958; Godefroid et al. 2006), Belgium. Type material The illustrated syntypes are stored at the Royal Belgian Institute of Natural Sciences, Brussels, coll. no. RBINS a 4666 (old no. 989; pl. 24 fig. 3), coll. no. RBINS a 4667 (old no. 993; pl. 24 fig. 24; coll. de Ryckholt) and RBINS a 4668 (old no. 988; pl. 25 fig. 23; coll. de Ryckholt).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF4FFFBFDE88043FE67FBBF.taxon	discussion	Remarks De Koninck (1885) introduced a new name for “ Arca obtusa var. ” in De Koninck (1842: pl. 2 fig. 15 a – b, not 15 c – d), non Phillips.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF4FFFBFDE78562FE25F909.taxon	description	Original source De Koninck (1885): 159, pl. 24 figs 50 – 51.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF4FFFBFDE78562FE25F909.taxon	materials_examined	Type stratum and age “ calcaire carbonifère de Visé (étage III) ”; V 3 b and V 3 c, Visean, Mississippian, Carboniferous (Demanet 1958; Godefroid et al. 2006). Type locality “ Visé ”; quarries south of Visé, on the east side of the Meuse River valley (Demanet 1958; Godefroid et al. 2006), Belgium. Type material Lectotype (RBINS a 4719; old no. 1343; coll. de Ryckholt) designated by Friedel & Amler (2024) is a BV steinkern. Paralectotype is a steinkern of a RV (RBINS a 4719; old no. 1342). The lectotype has been figured by De Koninck (1885: pl. 24 figs 50 – 51). Both stored at the Royal Belgian Institute of Natural Sciences, Brussels.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF4FFF4FDE98790FACEFDE8.taxon	description	Original source Krotov (1885): 246, pl. 3 fig. 13; originally as “ Geinitziana ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF4FFF4FDE98790FACEFDE8.taxon	materials_examined	Type stratum and age Artinskian, Cisuralian, Permian. Type locality “ Yazva River, below the village of Verkhnyaya Yazva; near the village of Antipina ”; Perm Krai, Russia. Type material Two syntype specimens, one of which was figured (263; Pjotr I. Krotov coll.), are stored at the A. A. Shtukenberg Geological Museum of Kazan Federal University, Kazan.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF4FFF4FDE98790FACEFDE8.taxon	discussion	Remarks Branson (1948) and Friedel et al. (2025) treated the taxon as a distinct species, Parallelodon geinitzianus.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFBFFF4FDDA845BFB81F8E7.taxon	description	Original source Meek & Worthen (1870): 40.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFBFFF4FDDA845BFB81F8E7.taxon	materials_examined	Type stratum and age “ Upper Coal Measures ”; today Pennsylvanian, Carboniferous. Type locality “ Springfield, Illinois ”, United States of America. Type material Not traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFBFFF4FDDA845BFB81F8E7.taxon	discussion	Remarks Type species of Carbonarca, listed in McAlester (1968) and Newell (1969).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFBFFF4FD8C8330FBE9FB54.taxon	description	Original source Waagen (1881): 255, pl. 20 fig. 3.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFBFFF4FD8C8330FBE9FB54.taxon	materials_examined	Type stratum and age “ Productus-limestone ”; middle to upper Permian (Henderson & Shen 2020). Type locality “ Morah ” and “ Khura ”; Morah between Faisalabad and Lahore and Khura near Khushab, Punjab province, Pakistan. Type material Waagen mentioned two specimens, both LV, for description. Whereabouts unknown.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFBFFF4FD8C8330FBE9FB54.taxon	discussion	Remarks Listed also by Reed (1944) and, as Parallelodon geminus, by Branson (1948).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFAFFF5FE0B8043FBD5FBBE.taxon	description	Original source Tornquist (1896): 103 [637], pl. 19 fig. 12; originally as “ Koeneni var. gibbosus ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFAFFF5FE0B8043FBD5FBBE.taxon	materials_examined	Type stratum and age “ [in der] schiefrigen Facies des Kohlenkalks ” (Tornquist 1895: 23) [shaly facies of the Carboniferous Limestone]; middle to upper Visean, Mississippian, Carboniferous (Amler 1987). Type locality “ Hohlweg unterhalb der Ferme [Bauernhof] Pütig ”; along the route from Bourbach-le-Haut to Masevaux, Département Haut-Rhin, France. Type material The whereabouts of the material studied by Tornquist (1896) are unknown. He stated the material as belonging to the “ Geologische Landesanstalt Elsass-Lothringen ”. Amler (1987) stated that the Tornquist collection in the Strasbourg Museum was destroyed in a fire (see also Hubmann 2014).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFAFFF5FE0B8043FBD5FBBE.taxon	discussion	Remarks Introduced as a new variety based on the greater width of the shell compared to the nominal form. Synonym of Parallelodon koeneni (Tornquist, 1896) according to Amler (1987).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFAFFF5FDEA8561FE22F9D3.taxon	description	Original source Yanishevsky (1900): 223, pl. 4 fig. 1 a – b.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFAFFF5FDEA8561FE22F9D3.taxon	materials_examined	Type stratum and age Astafieva-Urbajtis & Ramovš (1985) indicated a Baskhirian (Pennsylvanian, Carboniferous) age, while Mychko et al. (2025), based on a wider assessment of the area, attributed strata around the type locality to the Visean (Mississippian) to Bashkirian (Pennsylvanian), Carboniferous. Type locality Shartymka River, ca 8 km SE of Polyakovka, Bashkortostan Republic, Russia. Type material Type material (KP 426 / 449) is stored at the A. A. Shtukenberg Geological Museum of Kazan Federal University, Kazan.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFAFFF6FDFB87DEFE40FE58.taxon	description	Original source Yanishevsky (1900): 222, pl. 3 fig. 25.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFAFFF6FDFB87DEFE40FE58.taxon	materials_examined	Type stratum and age Astafieva-Urbajtis & Ramovš (1985) indicated a Baskhirian (Pennsylvanian, Carboniferous) age, while Mychko et al. (2025), based on a wider assessment of the area, attributed strata around the type locality to the Visean (Mississippian) to Bashkirian (Pennsylvanian), Carboniferous. Type locality Shartymka River, ca 8 km SE of Polyakovka, Bashkortostan Republic, Russia. Type material Type material (KP 426 / 444, 456, 464) is stored at the A. A. Shtukenberg Geological Museum of Kazan Federal University, Kazan.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF9FFF6FDE38340FBAAFB5F.taxon	description	Original source Yanishevsky (1900): 217, pl. 3 fig. 27.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF9FFF6FDE38340FBAAFB5F.taxon	materials_examined	Type stratum and age Astafieva-Urbajtis & Ramovš (1985) indicated a Baskhirian (Pennsylvanian, Carboniferous) age, while Mychko et al. (2025), based on a wider assessment of the area, attributed strata around the type locality to the Visean (Mississippian) to Bashkirian (Pennsylvanian), Carboniferous. Type locality Shartymka River, ca 8 km SE of Polyakovka, Bashkortostan Republic, Russia. Type material Type material of other parallelodontid species described by Yanishevsky (1900) is stored at the A. A. Shtukenberg Geological Museum of Kazan Federal University, Kazan; material of P. grandis seems to be missing though.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF9FFF6FDE38340FBAAFB5F.taxon	discussion	Remarks Listed also in Yanishevsky (1910); not found in the literature afterwards.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF9FFF6FE7B8442FDB6F800.taxon	description	Original source Pojeta et al. (1986): 88, pl. 35 fig. 2, pl. 38 figs 3 – 4, 6 – 7.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF9FFF6FE7B8442FDB6F800.taxon	materials_examined	Type stratum and age “ Sipai Formation (Emsian) Section 3, Beds 12, 13 ”; Lower Devonian. Type locality “ Heping Village, Yongfu County, Guangxi ”, China. Type material Holotype (GXD- 038) is a LV. Several paratypes available (GXD- 037, - 644, - 646, - 656, - 651). All stored at the Yichang Institute of Geology and Mineral Resources (today Wuhan Center of China Geological Survey), Wuhan, China.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF9FFF6FE7B8442FDB6F800.taxon	discussion	Remarks Listed also in Liao & Ruan (2003) and Chen et al. (2018); Amler & Friedel (2025) doubted affinities with parallelodontid arcoids.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF8FFF7FD8685F3FD02F8D1.taxon	description	Original source De Koninck (1851): 672 [22], pl. 57 fig. 9 a – c; in the plate caption as “ Arca (Cucullaea) Haimeana ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF8FFF7FD8685F3FD02F8D1.taxon	materials_examined	Type stratum and age “ calcaire carbonifère inférieur de Visé ”; V 3 b and V 3 c, Visean, Mississippian, Carboniferous (Demanet 1958: 29; Godefroid et al. 2006). Type locality “ Visé ”; quarries south of Visé, on the east side of the Meuse River valley (Demanet 1958; Godefroid et al. 2006), Belgium. Type material Whereabouts unknown.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF8FFF7FD8685F3FD02F8D1.taxon	discussion	Remarks Hind (1897) attributed the species to the genus Parallelodon, Paul (1941) to Grammatodon. Revised (as Parallelodon haimeanus) by Amler (1987).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF8FFF7FEA28043FEFAFDD1.taxon	description	Original source Yao et al. (1980): 8 (table).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF8FFF7FEA28043FEFAFDD1.taxon	discussion	Remarks Mentioned only in a table in Yao et al. (1980) from the Lower Changxing [Changhsing] Limestone (Lopingian; Zhang 2009) at Zhongling, Nayong, Guizhou and Zhongying, Qinglong, Guizhou (China). However, the species was not described and is therefore a nomen nudum; not found in the literature afterwards.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF8FFF7FDF583D8FE27FB2D.taxon	description	Original source Wang (1982): 459, pl. 2 figs 22 – 33.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFF8FFF7FDF583D8FE27FB2D.taxon	materials_examined	Type stratum and age Lower section of the Miaochong Formation; Pennsylvanian (Zhang 2009). Type locality Eastern slope of Daorenchong, Gushi County, Henan, China. Type material The holotype (Y 0059) and paratypes (Y 0060 to Y 0069) are stored at the Henan Geological Bureau, Zhengzhou, China.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFFFFF0FDC88043FA98FC01.taxon	description	Original source Hall & Whitfield (1869): 13.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFFFFF0FDC88043FA98FC01.taxon	materials_examined	Type stratum and age “ Hamilton group [...] soft shales of Bedford ”; Middle Devonian. Type locality “ in most of the localities from Schoharie county to the centre of the State, [...] in Onandaga county, and at Canandaigua and Seneca lakes. [...] in the town of Bedford, Cuyahoga county, Ohio ”, United States of America. Type material Hall did not designate a holotype; syntypes (AMNH-FI- 5301, AMNH-FI- 6555) are stored at the American Museum of Natural History, New York.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFFFFF0FDC88043FA98FC01.taxon	discussion	Remarks Pojeta et al. (1986: 89) placed the species in Parallelodon, Linsley (1994) in Gramatodon [sic].	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFFFFF0FD8082A8FE1CF8BC.taxon	description	Original source Dawson (1868): 302, text-fig. 102 a – c; originally as “ Hardingi ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFFFFF0FD8082A8FE1CF8BC.taxon	materials_examined	Type stratum and age “ bed (e) ”, on p. 280 further specified as “ Stewiacke limestone [...], Productus Limestone ”; part of the Windsor Group, middle to upper Visean, Mississippian, Carboniferous (Utting 1978). Type locality “ Windsor ”; Nova Scotia, Canada. Type material Dawson had two specimens. Beede (1911) selected the specimen figured on fig. 102 a of Dawson (1868) as the “ type ” (constituting a valid lectotype designation). He separated the other specimen as a new species: dawsoni. Both species are stored together at the Redpath Museum of McGill University, Montreal, Canada, under coll. no. 2820 (coll. Dawson and Hartt).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFFFFF0FD8082A8FE1CF8BC.taxon	discussion	Remarks As Parallelidon [sic] hardingi in Beede (1911: 168, textfig.) and Bell (1929: 156, pl. 26 figs 13 – 19); as Grammatodon hardingi in Paul (1941: 118); as Grammatodon (Parallelidon) [sic] hartingi [sic] in Calder (1998: 297).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFFFFF1FD9A8663FAA5FDCA.taxon	description	Original source Caster (1930): 202 [60], pl. 44 [23] fig. 7.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFFFFF1FD9A8663FAA5FDCA.taxon	materials_examined	Type stratum and age “ sandstone, below the Olean conglomerate ”; Lower Mississippian, Carboniferous (Berg et al. 1993). Type locality “ Stickley, Pa. ”; apparently misspelling of Stickney, 15 km west of Bradford, Pennsylvania, United States of America. Type material Studied material is stored at the paleontological collection of Cornell University, Ithaca, New York, under the coll. no. 5235. There seems to be only an external mould of a LV as the base of this species.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFEFFF1FDFF83D5FCF4FA01.taxon	description	Original source Bird (1968): 139, pl. 13 figs 1 – 2.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFEFFF1FDFF83D5FCF4FA01.taxon	materials_examined	Type stratum and age “ Bed ten of Gaptank Formation ”; Upper Pennsylvanian, Carboniferous according to Wardlaw & Nestell (2019). Type locality “ [USNM] locality 700 a – same as locality 700 [2 miles S. 17 ° E. of Gaptank, 1 1 / 4 miles E. of a point on the Fort Stockton road 2 miles S. of Gaptank, about 23 1 / 2 miles NE of Marathon, Texas] but 1 / 4 mile E. in a small canyon ”, United States of America. Type material Holotype is a RV (USNM PAL 155835; pl. 13 fig. 1 a – b). Paratype is a RV (USNM PAL 155836; pl. 13 fig. 2 a – b). All stored at the Smithsonian National Museum of Natural History, Paleobiology Collection, Washington, D. C.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFEFFF1FDFF83D5FCF4FA01.taxon	discussion	Remarks Bird (1968) consistently used a feminine ending for all species of Grammatodon, but the gender of the genus is masculine; the correct spelling is hexacostatus.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFEFFF2FD9B84A8FAF2FE29.taxon	description	Original source Knod (1908): 530, pl. 25 figs 8 – 9 a; originally as “ Hohmanni ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFEFFF2FD9B84A8FAF2FE29.taxon	materials_examined	Type stratum and age Devonian (no further information given). Type locality “ Yura. 80 km O. von Huanchaca ” [Yura, 80 km east of Huanchaca]; Potosí Department, Bolivia. Type material Syntypes (coll. no. 512, 513) are stored in the type cabinet of the collection of the Geologisches Institut of the University Freiburg (Knod 1908: 494).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFEFFF2FD9B84A8FAF2FE29.taxon	discussion	Remarks Knod (1908) himself doubted the systematic position. Cossmann (1909: 21) stated that “ it is probably neither a Parallelodon nor a Beushausenia ” (translated from French). The name was not found in literature after that. Placement uncertain (Amler & Friedel 2025); potentially a leptodesmatid (JCF pers. obs.).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFDFFF2FE6980F1FD27FC13.taxon	description	Original source Zhang et al. (1977): 491, pl. 192 fig. 16.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFDFFF2FE6980F1FD27FC13.taxon	materials_examined	Type stratum and age Wujiaping Formation, Wuchiapingian, Lopingian, Permian. Type locality Lichuan, Hubei province, China. Type material Holotype is a BV specimen (IV 55308) which is stored at the Hubei Institute of Geology (today Hubei Institute of Geosciences), Wuhan, China.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFDFFF2FDFC829FFDF0FA75.taxon	description	Original source Weller (1916): 249, pl. 16 fig. 24.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFDFFF2FDFC829FFDF0FA75.taxon	materials_examined	Type stratum and age “ Ste. Genevieve Limestone ”; Chesterian, Mississippian, Carboniferous. Type locality “ Fountain Creek, two miles SW of Waterloo, Monroe County, Illinois ”, United States of America. Type material Holotype (FMNH UC 14833) stored at the Field Museum of Natural History, Chicago (formerly Walker Museum, University of Chicago).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFDFFF3FDEA84A5FBE4FEC9.taxon	description	Original source Wanner (1922): 71, pl. 154 fig. 3 a – b.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFDFFF3FDEA84A5FBE4FEC9.taxon	materials_examined	Type stratum and age Probably Cisuralian, Permian (Charlton et al. 2002). Type locality “ Basleo ”; Basleo near Niki-Niki, East Nusa Tenggara, Timor Tengah Selatan, West Timor, Indonesia (Charlton et al. 2002). Type material Whereabouts unknown.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFDFFF3FDEA84A5FBE4FEC9.taxon	discussion	Remarks Wanner (1922) described this species as unequivalved. No straight hinge line is recognisable in his illustrations, accordingly the assignment to the genus Parallelodon is doubtful.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFCFFF3FE7E80D7FACFFB04.taxon	description	Original source Sandberger & Sandberger (1850 – 1856): pl. 28 fig. 11 [description on p. 274 appeared in 1856].	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFCFFF3FE7E80D7FACFFB04.taxon	materials_examined	Type stratum and age “ Stringocephalenkalk ”; upper Givetian, Middle Devonian. Type locality “ Villmar ”; Villmar near Limburg on the Lahn, Hesse, Germany. Type material Nine syntypes (MWNH-DEVO- 000232) are stored at the Museum Wiesbaden, Hessisches Landesmuseum für Kunst und Natur. One of the shells is the type material of Macrodus villmarensis Beushausen, 1895.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFCFFF3FE7E80D7FACFFB04.taxon	discussion	Remarks Sandberger & Sandberger (1856: 274) listed Arca michelini d’Archiac & Verneuil, 1842 in synonymy, but without explanation. We are not aware of any homonymy issue; therefore, their name is a junior objective synonym of A. michelini (today in Parallelodon). Sandberger & Sandberger distinguished a longer (fig. 11) and a shorter (fig. 11 a) variety; Beushausen (1895) separated the latter as a new species, Macrodus villmarensis, and treated the elongated variety as M. michelini d’Archiac & de Verneuil, 1842.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFCFFF3FE1585ABFD92F829.taxon	description	Original source Whidborne (1896): 112, pl. 12 figs 4 – 5.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFCFFF3FE1585ABFD92F829.taxon	materials_examined	Type stratum and age Pilton Shales, Pilton Formation, upper Famennian, Upper Devonian (Amler 1995). Type locality Quarry Poleshill, Bradiford near Barnstaple, Devon, United Kingdom. Type material Lectotype (LV steinkern) designated by Amler (1995: pl. 1 fig. 11), coll. no. SM. H. 324 (coll. Porter, also figured in Whidborne 1896: pl. 12 fig. 5). Paralectotype (RV steinkern), coll. no. SM. H. 325, figured by Whidborne (1896: pl. 12 fig. 4) and Amler (1995: pl. 1 fig. 10). Both stored at the Sedgwick Museum Cambridge.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFFCFFF3FE1585ABFD92F829.taxon	discussion	Remarks Re-described by Amler (1995).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE3FFECFDC28043FBB2FC24.taxon	description	Original source Korejwo & Teller (1964): 239, pl. 3 figs 8 – 10, text-fig. 5.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE3FFECFDC28043FBB2FC24.taxon	materials_examined	Type stratum and age Upper Monograptus angustidens (= Uncinatograptus uniformis angustidens) zone, originally correlated with the Ludlowian (upper Silurian), presently considered to represent the lowermost Devonian (Becker et al. 2020). Type locality Borehole at Chełm, Lublin Voivodeship, Poland. Type material Not traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE3FFECFDC28043FBB2FC24.taxon	discussion	Remarks According to Amler & Friedel (2025) not belonging to parallelodontids.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE3FFECFDDB828BFACFF92A.taxon	description	Original source De Koninck (1885): 149, pl. 26 figs 5, 10 – 12, 17 – 18.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE3FFECFDDB828BFACFF92A.taxon	materials_examined	Type stratum and age “ calcaire carbonifère des Pauquys et de Furfooz (étage II) ”; Waulsort Formation, upper Tournaisian, Carboniferous. Type locality “ Pauquys, Furfooz ”; Hastière and Dinant, Namur, Wallonia, Belgium. Type material The illustrated syntypes are stored at the Royal Belgian Institute of Natural Sciences, Brussels, coll. no. RBINS a 4682 (old no. 692; pl. 26 fig. 5; coll. Dupont), RBINS a 4683 (old no. 689; pl. 26 fig. 10; coll. Dupont), RBINS a 4684 (old no. 656; pl. 26 figs 11 – 12; coll. Dupont), RBINS a 4685 (old no. 690; pl. 26 figs 17 – 18; coll. Dupont).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE3FFECFDDB828BFACFF92A.taxon	discussion	Remarks Potentially a senior synonym of Parallelodon simplex (Tornquist, 1896) according to Amler (1987: 164).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE3FFEDFDE787F5FCBCFC93.taxon	description	Original source De Koninck (1876): 287, pl. 16 fig. 5.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE3FFEDFDE787F5FCBCFC93.taxon	materials_examined	Type stratum and age Etheridge (1878: 63, there as “ Arca ”) listed the age of this species as “ Carboniferous ”; this was repeated by Waterhouse (1958). Campbell & Bein (1971) considered the strata at the locality as probably lower Carboniferous. Type locality Burragood, on the right bank of the Paterson River, New South Wales, Australia. Type material Whereabouts unknown.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE3FFEDFDE787F5FCBCFC93.taxon	discussion	Remarks Placed by Reed (1932) and Termier et al. (1974) in Parallelodon (as “ interrupta ”, but Parallelodon is masculine). In some cases, the first description is cited as of 1898, which is the publication date of the English translation of De Koninck’s (1876) work.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE2FFEDFE15821EFD3BF9B4.taxon	description	Original source De Koninck (1885): 148, pl. 25 figs 31 – 32.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE2FFEDFE15821EFD3BF9B4.taxon	materials_examined	Type stratum and age “ calcaire carbonifère des Pauquys (étage II) ”; Waulsort Formation, upper Tournaisian, Mississippian, Carboniferous. Type locality “ Pauquys ”; Hastière, Namur, Wallonia, Belgium. Type material The illustrated syntype is stored at the Royal Belgian Institute of Natural Sciences, Brussels, coll. no. RBINS a 4679 (old no. 696; pl. 25 figs 31 – 32; coll. Dupont).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE2FFEDFE15821EFD3BF9B4.taxon	discussion	Remarks Secondary homonym of Palaearca interrupta De Koninck, 1876, which was placed in Parallelodon by Reed (1932) and Termier et al. (1974).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE2FFEEFE2F877BFCADFDB5.taxon	description	Original source Foerste (1909): 521, pl. 27 fig. 15 a – c; originally as “ hamiltoniae-irvinensis var. nov. ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE2FFEEFE2F877BFCADFDB5.taxon	materials_examined	Type stratum and age “ Bedford-Berea ”; upper Famennian, Upper Devonian (Over 2021). Type locality “ Indian Fields, Irvine, Kentucky ”, United States of America. Type material Syntype (USNM PAL 78759) stored at the Smithsonian National Museum of Natural History, Paleobiology Collection, Washington, D. C.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE2FFEEFE2F877BFCADFDB5.taxon	discussion	Remarks The variety was raised to species level and placed in Parallelodon by Hyde (1953: 300), Driscoll (1965: 99) and and Pashin & Ettensohn (1992: 28).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE1FFEEFF3784F0FDEAF861.taxon	description	Original source Astafieva-Urbajtis & Ramovš (1978): 11, pl. 1 figs 4 – 6.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE1FFEEFF3784F0FDEAF861.taxon	materials_examined	Type stratum and age “ verkhniy karbon, gzhel’skiy yarus ”; Auernig Formation, Gzhelian, Carboniferous. Type locality “ Karavanke Alps (loc. Spodnja počivala = ‘ Javornik-Fall’, Javorniški rovt) ”, Slovenia. Type material Type material is stored at the Gornjesavski muzej Jesenice, Slovenia, formerly Technical Museum of zelezarne Jesenica. Holotype has the coll. no. USMJ 61, additionally figured specimens stored under coll. no. USMJ 63 and USMJ 107.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE1FFEEFEE88365FD26FB90.taxon	description	Original source Astafieva-Urbajtis & Ramovš (1978): 10, pl. 1 fig. 2 a – b.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE1FFEEFEE88365FD26FB90.taxon	materials_examined	Type stratum and age “ verkhniy karbon, gzhel’skiy yarus ”; Auernig Formation, Gzhelian, Carboniferous. Type locality “ Karavanke Alps (loc. Spodnja počivala = ‘ Javornik-Fall’, Javorniški rovt) ”, Slovenia. Type material Type material is stored at the Gornjesavski muzej Jesenice, Slovenia, formerly Technical Museum of zelezarne Jesenica (holotype: USMJ 65).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE1FFEEFE978518FC46FA29.taxon	description	Original source Yao et al. (1980): 8 (table).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE1FFEEFE978518FC46FA29.taxon	discussion	Remarks Mentioned only in a table in Yao et al. (1980) from the Upper Changxing [Changhsing] Limestone (Lopingian; Zhang 2009) at Jiaozi Mt, Anshun, Guizhou (China). However, the species was not described and is therefore a nomen nudum; not found in the literature afterwards.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE0FFEFFE5F8043FCA6FC94.taxon	description	Original source Wei & Yang (1983): 392, pl. 156 fig. 16 a – b.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE0FFEFFE5F8043FCA6FC94.taxon	materials_examined	Type stratum and age Shiqiantan Formation, “ Middle Carboniferous ”; as Shihchientan Formation in Zhang (2009), Pennsylvanian, Carboniferous. Type locality Kelameli [also transliterated as Kelamaili], East Junggar, Xinjiang, China. Type material Yang did not designate a holotype, but the illustrated specimen (XBA- 336) is stored at Xinjiang Bureau of Geology and Mineral Resources, Urumqi, China.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE0FFEFFE07821BFC2AFBD0.taxon	description	Original source Nelzina (1960): 49.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE0FFEFFE07821BFC2AFBD0.taxon	discussion	Remarks Listed by Nelzina (1960) from the lower Permian of Samarskaya Luka at the western slope of Ural Mts, Russia. Nomen nudum, no description or indication provided.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE0FFEFFDFD85DFFD61F898.taxon	description	Original source Sayre (1930): 108, pl. 9 figs 4 – 7.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE0FFEFFDFD85DFFD61F898.taxon	materials_examined	Type stratum and age “ Drum limestone, oolitic member ”; Kansas City Formation, Missouri Group, Missourian, Pennsylvanian, Carboniferous (Moore 1949). Type locality “ Turner, Cherryvale (station 40) and Independence (stations 12, 23), Kansas; and Kansas City, Mo. ”, United States of America. Type material No types designated; whereabouts unknown.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE0FFEFFDFD85DFFD61F898.taxon	discussion	Remarks As Grammatodon kansasensis in Bird (1968).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE0FFE8FDDD8607FCDCFD55.taxon	description	Original source Chapman (1908): 39, pl. 4 fig. 58 (59?).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE0FFE8FDDD8607FCDCFD55.taxon	materials_examined	Type stratum and age “ Silurian (Melbournian) ”; Yan Yean Formation, Wenlock – Ludlow, Silurian. Type locality “ Police paddock, Kilmore, Bb. 22 ”; Kilmore, County of Dalhousie, Victoria, Australia. Type material Holotype is a steinkern (coll. no. P 7925). One additional specimen available, also steinkern (coll. no. P 7926). Stored at the collections of the Museums Victoria, Melbourne.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE0FFE8FDDD8607FCDCFD55.taxon	discussion	Remarks Mentioned in the type catalogue of Gill & Davies (1968). Systematic classification questionable, may rather be a taxodont protobranch (Amler & Friedel 2025).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE7FFE8FE2F8244FC2AF9B4.taxon	description	Original source Murchison et al. (1845): 313, pl. 19 fig. 11; originally as “ Kingiana ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE7FFE8FE2F8244FC2AF9B4.taxon	materials_examined	Type stratum and age “ Calcaires d’Iltchegulova. […] Ces calcaires sont subordonnés à la grande masse des grès et des conglomérats du système permien, et en forment ordinairement la base ”; Ilchegulova, basal limestone, Kungurian, Permian (Friedel et al. 2025). Type locality “ Calcaires d’Iltchegulova, dans la vallée de la Dioma, gouvernement d’Orenbourg ”; Dyoma [Dema] river valley, Il’chegulovo [Il’chigulovo], Bashkortostan Republic, Russia. Type material De Verneuil probably erected the species on a single LV, whereabouts unknown.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE7FFE8FE2F8244FC2AF9B4.taxon	discussion	Remarks Placed in the genus Macrodon by several authors (Chernyshev 1885; Amalitsky 1886; Netschajew 1894) and later in Parallelodon by Likharev (1925; as “ P. kingi ”), Maslennikov (1935; as “ P. kingi ”) and Friedel et al. (2025). See Friedel et al. (2025) for further info.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE7FFE9FE09877BFD0CFE59.taxon	description	Original source Aleksandri-Sadova (1959): p. 172, unnumbered pl. figs 1 – 19.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE7FFE9FE09877BFD0CFE59.taxon	materials_examined	Type stratum and age “ Karagandinsnaya svita ” [Karaganda Formation]; upper Visean to Serpukhovian (Sadykov & Korobkin 2019), Carboniferous. Type locality “ r. Kipchak ” [Kipchak River]; Karaganda Basin, near Saran, Kazakhstan. Type material Studied material stored at the Academician F. N. Chernyshev Central Geological Research Museum (TsNIGR museum), St Petersburg under collection no. 4 to 19 / 10967 (Romanovskaya et al. 1979: 124).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE7FFE9FE09877BFD0CFE59.taxon	discussion	Remarks Species not found in any subsequent work.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE6FFE9FDF18340FBEEFB5E.taxon	description	Original source Spriestersbach (1919): 461, pl. 33 fig. 1; originally as “ Kochi ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE6FFE9FDF18340FBEEFB5E.taxon	materials_examined	Type stratum and age “ aus den Oberen Honselner Schichten ”; Upper Honsel Formation, lower Givetian, Middle Devonian (German Stratigraphic Commission 2016; Löw et al. 2022). Type locality “ links an der Strasse dicht unter Neuloh, Blatt Herscheid [...]; Gardeweg, Blatt Wipperfürth ”; the former locality Neuloh does not exist anymore, it is located along today’s A 45 highway near Lüdenscheid-Piepersloh; the locality Gardeweg is north of Wipperfürth, North Rhine-Westphalia, Germany. Type material Syntypes are a LV (whereabouts unknown) and a figured RV (MB. M. 411, coll. Spriestersbach) which is stored at the Museum für Naturkunde, Berlin.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE6FFE9FDF18340FBEEFB5E.taxon	discussion	Remarks Not a Parallelodon, probably a taxodont protobranch (Amler & Friedel 2025).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE6FFE9FD838442FCAAF85C.taxon	description	Original source Tornquist (1896): 102 [636], pl. 19 fig. 5; originally as “ Koeneni ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE6FFE9FD838442FCAAF85C.taxon	materials_examined	Type stratum and age “ [in der] schiefrigen Facies des Kohlenkalks ” (Tornquist 1895: 23) [shaly facies of the Carboniferous Limestone]; middle to upper Visean, Mississippian, Carboniferous (Amler 1987). Type locality “ Hohlweg unterhalb der Ferme [Bauernhof] Pütig ”; along the route from Bourbach-le-Haut to Masevaux, Département Haut-Rhin, France. Type material The whereabouts of the material studied by Tornquist (1896) are unknown. He stated the material as belonging to the “ Geologische Landesanstalt Elsass-Lothringen ”. Amler (1987) stated that the Tornquist collection in the Strasbourg Museum was destroyed in a fire (see also Hubmann 2014).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE6FFE9FD838442FCAAF85C.taxon	discussion	Remarks Revised as Parallelodon koeneni by Amler (1987).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE5FFEAFE1C8043FD4AFBBF.taxon	description	Original source De Koninck (1898): 225 (footnote).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE5FFEAFE1C8043FD4AFBBF.taxon	materials_examined	Type stratum and age “ Gympie Beds ”; as “? Malchi Fm. ” (Mississippian, Carboniferous) in Rozefelds et al. (1990). Type locality Rockhampton District, Queensland, Australia. Type material The specimens illustrated by Etheridge (1892) and referred to in De Koninck (1898) are stored at the Queensland Museum under coll. no. F 1211 and F 1212 (De Vis collection; Rozefelds et al. 1990: 696).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE5FFEAFE1C8043FD4AFBBF.taxon	discussion	Remarks In the English translation of De Koninck’s (1876) work on Australian Palaeozoic fossils, the translator W. S. Dun remarked in a footnote for Palaearca costellata McCoy, 1944 that the species identified by Etheridge (1892) as Parallelodon costellata might be an undescribed species: “ Mr. Etheridge suggests the possibility of the Queensland form being a new species – Parallelodon Konincki, Eth. fil. ” The species was not found in the literature after that.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE5FFEAFDCF8562FC00F8FA.taxon	description	Original source Yanishevsky (1900): 219, pl. 3 figs 28 – 29; originally as “ Koninckianus ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE5FFEAFDCF8562FC00F8FA.taxon	materials_examined	Type stratum and age Astafieva-Urbajtis & Ramovš (1985) indicated a Baskhirian (Pennsylvanian, Carboniferous) age, while Mychko et al. (2025), based on a wider assessment of the area, attributed strata around the type locality to the Visean (Mississippian) to Bashkirian (Pennsylvanian), Carboniferous. Type locality Shartymka River, ca 8 km SE of Polyakovka, Bashkortostan Republic, Russia. Type material Type material (KP 426 / 442) is stored at the A. A. Shtukenberg Geological Museum of Kazan Federal University, Kazan.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE5FFEAFDCF8562FC00F8FA.taxon	discussion	Remarks Yanishevsky compared his species with Parallelodon bistriata (Portlock, 1843) (originally in Pullastra), P. elegantulus (De Koninck, 1844) and P. undatus De Koninck, 1885. The former two species are now placed in Cypricardinia, the last one with question mark in Parallelodon (Amler 1987). Listed also in Yanishevsky (1910, 1915); not found in the literature afterwards.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE4FFEBFDFC8561FA91F963.taxon	description	Original source De Koninck (1842): 119, pl. 2 fig. 14 a – c; originally as “ Lacordairiana ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE4FFEBFDFC8561FA91F963.taxon	materials_examined	Type stratum and age “ calcaire anthraxifère supérieur de Visé et à Tournay dans l’argile ”; V 3 b and V 3 c, Visean, and Tn 3 a und Tn 3 b, Tournaisian, Mississippian, Carboniferous (Demanet 1958: 29; Godefroid et al. 2006). Type locality “ Visé ” and “ Tournay ”; Visé, quarries south of Visé, on the east side of the Meuse River valley (Demanet 1958; Godefroid et al. 2006) and Tournai, Hainaut Province, Belgium. Type material Syntype (UCBL-EM 35401) is stored in the collection of the Géologie de l’Université Lyon, but does not match the figure. It is a RV, but De Koninck illustrated a BV specimen.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE4FFEBFDFC8561FA91F963.taxon	discussion	Remarks De Koninck (1885: 157) himself placed this species in Parallelodon (as P. lacordaireanus [sic]).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE4FFEBFDD58043FEE0FBBE.taxon	description	Original source Stuckenberg (1898): 209 [Russian], 338 [German], pl. 2 fig. 5 a – b.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE4FFEBFDD58043FEE0FBBE.taxon	materials_examined	Type stratum and age Branson (1948) indicated a Kungurian (Cisuralian, Permian) age for the type locality. Type locality “ Na pravom’ beregu r. Sylvy, na vershine izluchiny, obrashchennoy k’ severu, v’ 1 verste nizhe derevni Chastykh’, izvestnyak’ (C 2) vystupayet’ v’ vide kamnya Glazyrya, vozvyshayushchagosya do 100 metrov’ nad’ vodoyu ” [On the right bank of the Sylva River, at the top of the bend facing north, in a 1 - km section below the village of Chastykh [Chastye?], a limestone (C 2) formation emerges in the form of the Glazyr hill rising up to 100 meters above the water]; Perm Krai, Russia. Type material Not traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE4FFEBFDD58043FEE0FBBE.taxon	discussion	Remarks Girty (1909 a: 407) considered this species (as M. kungurensis) to be related with his Parallelodon multistriatus.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE4FFE4FDD5864EFD4AFD27.taxon	description	Original source De Koninck (1885): 151, pl. 26 figs 7 – 8.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE4FFE4FDD5864EFD4AFD27.taxon	materials_examined	Type stratum and age “ calcaire carbonifère de Visé (étage III) ”; V 3 b and V 3 c, Visean, Mississippian, Carboniferous (Demanet 1958: 29; Godefroid et al. 2006). Type locality “ Visé ”; quarries south of Visé, on the east side of the Meuse River valley (Demanet 1958; Godefroid et al. 2006), Belgium. Type material The illustrated syntype is stored at the Royal Belgian Institute of Natural Sciences, Brussels, coll. no. RBINS a 4693 (old no. 1039; coll. de Ryckholt).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEBFFE4FDD7838AFED9FB5F.taxon	description	Original source De Koninck (1885): 162, pl. 25 fig. 22, pl. 26 fig. 1.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEBFFE4FDD7838AFED9FB5F.taxon	materials_examined	Type stratum and age “ calcaire des Pauquys (étage II) ”; Waulsort Formation, upper Tournaisian, Carboniferous. Type locality “ Pauquys ”; Hastière, Namur, Wallonia, Belgium. Type material The illustrated syntypes are stored at the Royal Belgian Institute of Natural Sciences, Brussels, coll. no. RBINS a 4730 (old no. 730; pl. 25 fig. 22; coll. Dupont) and RBINS a 4731 (old no. 746; pl. 26 fig. 1; coll. Dupont).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEBFFE4FE238442FC37F8F0.taxon	description	Original source Feng et al. (1992): 515, pl. 7 figs 16 – 19.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEBFFE4FE238442FC37F8F0.taxon	materials_examined	Type stratum and age Lopingian, Permian. Type locality Laochang, Lancang, Yunnan, China. Type material Feng et al. (1992) missed to indicate a holotype. The following specimens have been illustrated: 90 L 17 (LV, fig. 16 a – b), 89 L 30 (steinkern of RV, fig. 17), 90 L 18 (external mould of RV, fig. 18), 90 L 19 (steinkern of LV, fig. 19). All specimens are kept in the Department of Geological History (today Department of Geobiology), of the School of Earth Sciences, Wuhan, China.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEAFFE5FDD48043FBA7FD40.taxon	description	Original source Gemmellaro (1896): 25, pl. 23 figs 1 – 3.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEAFFE5FDD48043FBA7FD40.taxon	materials_examined	Type stratum and age “ Calcare grossolano con Fusulina ”; Wordian to upper Permian (Sanfilippo et al. 2017). Type locality “ Pietra di Salomone ”; 3 km S of Palazzo Adriano, Palermo, Italy. Type material Gemmellaro did not designate types. His description based on three BV specimens (MGUP- 001.263). All syntypes are stored at the Museo Geologico Università Palermo, Italy.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEAFFE5FDF08269FDFAFA74.taxon	description	Original source De Koninck (1885): 146, pl. 24 figs 4 – 5.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEAFFE5FDF08269FDFAFA74.taxon	materials_examined	Type stratum and age “ calcaire carbonifère de Visé (étage III) ”; V 3 b and V 3 c, Visean, Mississippian, Carboniferous (Demanet 1958: 29; Godefroid et al. 2006). Type locality “ Visé ”; quarries south of Visé, on the east side of the Meuse River valley (Demanet 1958; Godefroid et al. 2006), Belgium. Type material The illustrated syntype is stored at the Royal Belgian Institute of Natural Sciences, Brussels, coll. no. RBINS a 4665 (old no. 1093; coll. de Ryckholt).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEAFFE5FDF08269FDFAFA74.taxon	discussion	Remarks Discussed by Amler (1987: 171).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEAFFE5FE4584A5FB8DF85F.taxon	description	Original source Zhang et al. (1977): 491, pl. 192 fig. 17.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEAFFE5FE4584A5FB8DF85F.taxon	materials_examined	Type stratum and age Longtan Formation, Wuchiapingian, Lopingian, Permian. Type locality Lianyuan County, Loudi, Hunan Province, China. Type material Holotype is a steinkern and external mould of a BV specimen (IV 55309) and it is stored at the Hubei Institute of Geology (today Hubei Institute of Geosciences), Wuhan, China.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE9FFE6FDFF8506FB5FF963.taxon	description	Original source Howse (1848): 246.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE9FFE6FDFF8506FB5FF963.taxon	materials_examined	Type stratum and age “ Magnesian-limestone ”; Ford or Raisby Formation, Zechstein, Changhsingian, Lopingian, Permian. Type locality “ Tunstall, Humbleton ”; County Tyne and Wear (formerly Durham), United Kingdom. Type material The whereabouts of the original material are unknown, probably kept in the collections of the Great North Museum: Hancock in Newcastle upon Tyne, UK (Friedel et al. 2025).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE9FFE6FDFF8506FB5FF963.taxon	discussion	Remarks Later, Howse (1857) himself listed the species as synonymous to “ Macrodon striata ” [= P. striatus (von Schlotheim, 1820)], which was followed by Friedel et al. (2025); see there for further info.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE9FFE6FDD78043FC5DFB9B.taxon	description	Original source Maslennikov (1935): 85 [Russian], 113 [English], pl. 3 fig. 6 a – e.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE9FFE6FDD78043FC5DFB9B.taxon	materials_examined	Type stratum and age “ Upper Permian ” (no further data given, might also be middle Permian following the revisions of Russian stratigraphy). Type locality “ s r. Vel’ - mezhdu ust’yami Shenoshi i Yelyugi i s r. Led’ - iz obnazheniya izvestnyakov u dd. Kokovinskoy i Paskinskoy ” [from the Vel River - between the mouths of the Shenon and Elug rivers and from the Led River - from the limestone outcrop near the villages of Kokovinskaya and Paskinskaya]; Arkhangelsk Oblast, Russia. Type material Maslennikov stated that he had about 30 specimens. Syntypes (coll. no. 5833) are stored at the Academician F. N. Chernyshev Central Geological Research Museum (TsNIGR museum), St Petersburg, Russia (Lutaenko 2013).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE9FFE6FDD78043FC5DFB9B.taxon	discussion	Remarks Illustrated also in Muromtseva & Guskov (1984: 37, pl. 36 figs 8 – 9).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE9FFE7FDCC864EFA8BFD8C.taxon	description	Original source Guo (1985): 122, pl. 11 fig. 8.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE9FFE7FDCC864EFA8BFD8C.taxon	materials_examined	Type stratum and age Lopingian, Permian. Type locality Longjiu, Jiuzhai, Funing County, Yunnan, China. Type material Illustrated specimen (IVy 0132) is stored at the Geological Museum of China, Beijing.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE9FFE7FDCC864EFA8BFD8C.taxon	discussion	Remarks Considered a synonym of Parallelodon qinghaiensis Liu in Gu et al., 1976 by Yang et al. (2016).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE8FFE7FDEE8313FB5AFB21.taxon	description	Original source Maslennikov (1935): 86 [Russian], 114 [English], pl. 3 figs 7 – 8.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE8FFE7FDEE8313FB5AFB21.taxon	materials_examined	Type stratum and age “ Upper Permian ” (no further data given, might also be middle Permian following the revision of Russian stratigraphy). Type locality “ s r. Led’ vyshe d. Kokovinskoy ” [on the Led River, upstream of Kokovinskaya village]; Arkhangelsk Oblast, Russia. Type material Syntypes are part of Vaga collection (coll. no. 5833). Stored at the Academician F. N. Chernyshev Central Geological Research Museum (TsNIGR museum), St Petersburg, Russia (Lutaenko 2013).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE8FFE7FDD08588FB60F827.taxon	description	Original source Williams (1931): 139, pl. 1 figs 5 – 6.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE8FFE7FDD08588FB60F827.taxon	materials_examined	Type stratum and age Louisiana Limestone, Kinderhookian; Tournaisian, Mississippian, Carboniferous. Type locality “ locality 615, along the Mississippi River, at Louisiana, Missouri ”; the locality is further specified on p. 133 as “ NE. 1 / 4 sec. 18, T 54 N., R. 1 W. - North of Louisiana Milling Co., Louisiana, Missouri ”, United States of America. Type material Holotype, a LV (3656), and paratype, a RV (3657), are stored at the University of Missouri mentioned by Williams (1943).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFE8FFE7FDD08588FB60F827.taxon	discussion	Remarks Williams (1943) noted that the species might be a member of Cypricardinia, but the similarity to P. sulcatus (Weller, 1906) “ outweighed other considerations and was the deciding factor. ”	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEFFFE0FE988043FC2CFC94.taxon	description	Original source Astafieva-Urbajtis & Ramovš (1985): 12, pl. 1 figs 3 – 4.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEFFFE0FE988043FC2CFC94.taxon	materials_examined	Type stratum and age “ verkhniy karbon, gzhel’skiy yarus ”; Auernig Formation, Gzhelian, Carboniferous. Type locality “ Yugoslaviya, gory Karavanke [...] Planina pod Golico 2 ”, Karavanke Mts, Slovenia. Type material Type material is stored at the Gornjesavski muzej Jesenice, Slovenia, formerly Technical Museum of zelezarne Jesenica. Holotype with coll. no. USMJ 851, additionally figured specimen (“ topotype ”) with coll. no. USMJ 852; further material mentioned by the author.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEFFFE0FDE6821BFD0CF9B9.taxon	description	Original source Lobanova (1961): p. 56, pl. 1 figs 4 – 6.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEFFFE0FDE6821BFD0CF9B9.taxon	materials_examined	Type stratum and age “ iz verkhnepermskikh otlozheniya ” [from upper Permian deposits]; no further details provided, may refer to middle or upper Permian. Type locality “ Zapadnogo Primor’ya, rayon pos. Grodekovo, mezhdurech’ye Takheyazha i Tochilki ” [Western Primorye, Grodekovo settlement area, interfluve of the Takheyazh and Tochilka rivers], Russia. Type material Figured specimen (holotype) is stored at the Academician F. N. Chernyshev Central Geological Research Museum (TsNIGR museum), St Petersburg, under coll. no. 3 / 9365 (see also Kadlets et al. 1996: 197).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEFFFE0FDE6821BFD0CF9B9.taxon	discussion	Remarks Species not found in any subsequent work.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEFFFE1FE108760FD74FE58.taxon	description	Original source Dahmer (1915): 213, pl. 8 figs 14 – 16.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEFFFE1FE108760FD74FE58.taxon	materials_examined	Type stratum and age “ obere Koblenzer Schichten ”; Emsian, Lower Devonian (Amler & Friedel 2025). Type locality “ Hauberg bei Mandeln bei Dillenburg ” [Hau-Berg, Mandeln near Dillenburg]; Hesse, Germany. Type material Type material is stored at the Senckenberg Research Institute and Natural History Museum, Frankfurt am Main, under coll. no. SMF 60554, SMF 67524 to SMF 67526 (coll. Dahmer).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEFFFE1FE108760FD74FE58.taxon	discussion	Remarks Recently studied by Amler & Friedel (2025).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEEFFE1FD8A8442FCF4F8CA.taxon	description	Original source de Stefani (1917): 27, pl. 1 figs 12, 15 – 16, 18 – 19, 21.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEEFFE1FD8A8442FCF4F8CA.taxon	materials_examined	Type stratum and age Rio Marina Formation, upper Carboniferous to lower Permian (De Stefani 1914; Bortolotti et al. 2001). Type locality “ Cala Baccetti ”; a small bay south of Cavo, Elba Island, Italy. Type material Studied material (IGF 126 E, IGF 127 E, IGF 149 E) is stored in the De Stefani collection at the Museo di Storia Naturale di Firenze, Italy.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEEFFE1FD8A8442FCF4F8CA.taxon	discussion	Remarks Not found in the literature after the original description.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEEFFE1FDDA8340FEC7FB5F.taxon	description	Original source Winchell (1862): 415.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEEFFE1FDDA8340FEC7FB5F.taxon	materials_examined	Type stratum and age Marshall sandstone, Tournaisian – Visean, Mississippian, Carboniferous (McGlannan et al. 2022). Type locality “ Marshall ”; Calhoun County, Michigan, United States of America. Type material Winchell did not indicate a type or number of specimens. Driscoll (1965) reported a “ holotype ”, a RV (UMMP 26877) and a “ paratype ”, a poorly preserved specimen from the type locality (UMMP 44272). However, Driscoll’s designations as holotype / paratype are invalid; both are syntypes. Syntypes are stored at the University of Michigan, Museum of Paleontology, Ann Arbor.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEEFFE1FDDA8340FEC7FB5F.taxon	discussion	Remarks Driscoll (1965) placed the species in Parallelodon (Cosmetodon) and illustrated the so-called “ holotype ” (pl. 16 figs 1 – 3).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEDFFE2FD9982C2FB8FFA57.taxon	description	Original source Clarke (1907): 234, unnumbered text-fig.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEDFFE2FD9982C2FB8FFA57.taxon	materials_examined	Type stratum and age “ Lower Devonic ”; Dalhousie Group, Lower Devonian. Type locality “ Dalhousie, N. B. ”; New Brunswick, Canada. Type material Whereabouts unknown.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEDFFE2FD9982C2FB8FFA57.taxon	discussion	Remarks Also described in Clarke (1909); mentioned by Reed (1927). Due to the lack of hinge characters, Amler & Friedel (2025) questioned a classification in the Parallelodontidae.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEDFFE2FDE28043FE5AFCDE.taxon	description	Original source Kanev (2006): 119, fig. 18, ∂.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEDFFE2FDE28043FE5AFCDE.taxon	materials_examined	Type stratum and age “ verkhnyaya perm’, biarmiyskiy otdel, kazanskiy yarus, verkhnekazanskiy (krasnovidovskiy) pod ” yarus ” [upper Permian, Biarmian division, Kazanian stage, upper Kazanian (Krasnovidovian) substage]. Type locality “ p-ov Kanin, poberezh’ye Choshskoy guby mezhdu mysom Nadteysalya i mysom Yarnisalya ” [Kanin Peninsula, coast of the Cheshskaya Bay between Cape Nedteysalya and Cape Yarnisalya]; Nenets Autonomous Okrug, Russia. Type material Holotype (13 / 367) is a RV stored at the Geological Museum of the Institute of Geology Komi SC UB RAS, Syktyvkar, Russia.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEDFFE3FDD7875AFAB0FDCF.taxon	description	Original source De Koninck (1851): 670, pl. 57 fig. 8 a – c; originally as “ M’Coyana ” in the text and as “ Arca (Cucullaea) M’Coyana ” in the plate caption.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEDFFE3FDD7875AFAB0FDCF.taxon	materials_examined	Type stratum and age “ calcaire carbonifère inférieur de Visé ”; V 3 b and V 3 c, Visean, Mississippian, Carboniferous (Demanet 1958: 29; Godefroid et al. 2006). Type locality “ Visé ”; quarries south of Visé, on the east side of the Meuse River valley (Demanet 1958; Godefroid et al. 2006), Belgium. Type material Probably stored in the collection of the Géologie de l’Université Lyon, but not traced. Additional material of De Koninck stored at the Royal Belgian Institute of Natural Sciences, Brussels.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFEDFFE3FDD7875AFAB0FDCF.taxon	discussion	Remarks Cucullaea tenuistria McCoy, 1844 was renamed Arca M’Coyana by De Koninck (1851: 670), only for the risk of confusion with the Cretaceous species Arca tenuistriata Münster in Goldfuss, 1837 (p. 142, erroneously listed as Arca tenuistria Münster in the index: 305). Since no homonymy exists, the name is a junior objective synonym of Parallelodon tenuistria. Apparently, De Koninck (1885: 162) realised that as well, ignored his earlier renaming, and used Parallelodon tenuistria as the valid name.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFECFFE3FDCC8401FDC5F805.taxon	description	Original source d’Archiac & de Verneuil (1842): 373, pl. 36 fig. 6; originally as “ Michelini ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFECFFE3FDCC8401FDC5F805.taxon	materials_examined	Type stratum and age Age not stated; Middle or Upper Devonian. Type locality “ Paffrath ”; near Cologne, North Rhine-Westphalia, Germany. Type material Not traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFECFFE3FDCC8401FDC5F805.taxon	discussion	Remarks Amler & Friedel (2025) placed this species in Parallelodon; see also discussion of Arca inermis G. Sandberger & F. Sandberger, 1854.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFECFFE3FDC783D3FB5DFA9F.taxon	description	Original source De Koninck (1885): 158, pl. 24 figs 7 – 13, pl. 25 figs 41 – 42, pl. 26 figs 6, 15.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFECFFE3FDC783D3FB5DFA9F.taxon	materials_examined	Type stratum and age “ calschiste des environs de Tournai (étage I) ”; Tn 3 a and Tn 3 b, lower Ivorian, Tournaisian, Carboniferous (Demanet 1958; Sartenaer & Plodowski 1996; Poty et al. 2002; Godefroid et al. 2006). Type locality “ Tournai ”; Hainaut Province, Belgium. Type material The illustrated syntypes are stored at the Royal Belgian Institute of Natural Sciences, Brussels, coll. no. RBINS a 4710 (old no. 215; pl. 24 figs 7 – 8), RBINS a 4711 (old no. 150; pl. 24 fig. 10; coll. de Ryckholt), RBINS a 4712 (old no. 137; pl. 24 figs 9, 11 – 12), RBINS a 4713 (old no. 136; pl. 24 fig. 13; coll. de Ryckholt), RBINS a 4714 (old no. 146; pl. 25 figs 41 – 42; coll. de Ryckholt), RBINS a 4715 (old no. 146; pl. 26 fig. 6; coll. de Ryckholt) and RBINS a 4716 (old no. 185; pl. 26 fig. 15, coll. Lettou).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF93FF9CFDCE8043FC04FCEF.taxon	description	Original source Meek & Worthen (1866 b): 261.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF93FF9CFDCE8043FC04FCEF.taxon	materials_examined	Type stratum and age “ Chester division of the Subcarboniferous series ”; Chesterian, Mississippian, Carboniferous. Type locality “ St. Genevieve County, Missouri [...]; Randolph County, Illinois ”, United States of America. Type material Not traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF93FF9CFDCE8043FC04FCEF.taxon	discussion	Remarks As Parallelodon micronema in a species list in Mansfield (1927).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF93FF9CFDF18232FDD8F9B7.taxon	description	Original source Worthen (1884): 17.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF93FF9CFDF18232FDD8F9B7.taxon	materials_examined	Type stratum and age “ Oolitic beds of the St. Louis limestone ”; St Louis Limestone, Böue River Group, Visean, Mississippian, Carboniferous. Type locality “ Monroe county, Ill. ” [Monroe County, Illinois], United States of America. Type material Syntype (no. 2524) stored at the Illinois State Museum.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF93FF9CFDF18232FDD8F9B7.taxon	discussion	Remarks Recombined as Parallelodon minima [sic; should be P. minimus] by Weller (1916: 248), Hernon (1935: 690) and Hoare (1993: 378).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF93FF9DFE26877AFBAFFE59.taxon	description	Original source De Koninck (1885): 151, pl. 24 figs 28 – 30.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF93FF9DFE26877AFBAFFE59.taxon	materials_examined	Type stratum and age “ calcaire carbonifère de Visé (étage III) ”; V 3 b and V 3 c, Visean, Mississippian, Carboniferous (Demanet 1958: 29; Godefroid et al. 2006). Type locality “ Visé ”; quarries south of Visé, on the east side of the Meuse River valley (Demanet 1958; Godefroid et al. 2006), Belgium. Type material The illustrated syntype is stored at the Royal Belgian Institute of Natural Sciences, Brussels, coll. no. RBINS a 4692 (old no. 1194; coll. de Ryckholt).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF93FF9DFE26877AFBAFFE59.taxon	discussion	Remarks A secondary junior homonym of Parallelodon minimus (Worthen, 1884).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF92FF9DFDFF8297FD23F99C.taxon	description	Original source De Koninck (1885): 151, pl. 25 fig. 10.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF92FF9DFDFF8297FD23F99C.taxon	materials_examined	Type stratum and age “ calcaire carbonifère de Visé (étage III) ”; V 3 b and V 3 c, Visean, Mississippian, Carboniferous (Demanet 1958: 29; Godefroid et al. 2006). Type locality “ Visé ”; quarries south of Visé, on the east side of the Meuse River valley (Demanet 1958; Godefroid et al. 2006), Belgium. Type material The illustrated syntype is stored at the Royal Belgian Institute of Natural Sciences, Brussels, coll. no. RBINS a 4691 (old no. 1061; coll. Nyst).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF92FF9DFE998340FE3EFC0B.taxon	description	Original source Yao et al. (1980): 8 (table).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF92FF9DFE998340FE3EFC0B.taxon	discussion	Remarks Mentioned only in a table in Yao et al. (1980) from the Lower Changxing [Changhsing] Limestone at Jiaozi Mt, Anshun, Guizhou, as well as the upper Longtan Formation (both upper Permian) at Puga, Zhijin, Guizhou (China). However, the species was not described and is therefore a nomen nudum; not found in the literature afterwards. If available, the name would be a primary junior homonym of Parallelodon minimus De Koninck, 1885 and a secondary junior homonym of Parallelodon minimus (Worthen, 1884).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF92FF9EFDA18703FC49FE59.taxon	description	Original source Winchell (1863): 15.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF92FF9EFDA18703FC49FE59.taxon	materials_examined	Type stratum and age “ Yellow Sandstone beneath Burlington Limestone ”; Osagean, Tournaisian-Visean, Mississippian, Carboniferous (Thompson 2001). Type locality “ Burlington, Iowa ”, United States of America. Type material Not traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF92FF9EFDA18703FC49FE59.taxon	discussion	Remarks Classified in Macrodon by Weller (1900: 90, pl. 3 fig. 16; as “ modesta ”), in Parallelodon by Moore (1928: 28), and in Grammatodon by Paul (1941: 121; as “ modestus ”).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF91FF9EFDEB8340FC30FB21.taxon	description	Original source De Koninck (1885): 148, pl. 26 fig. 9.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF91FF9EFDEB8340FC30FB21.taxon	materials_examined	Type stratum and age “ calcaire des Pauquys (étage II) ”; Waulsort Formation, upper Tournaisian, Carboniferous. Type locality “ Pauquys ”; Hastière, Namur, Wallonia, Belgium. Type material The illustrated syntype is stored at the Royal Belgian Institute of Natural Sciences, Brussels, coll. no. RBINS a 4681 (old no. 688; coll. Dupont).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF91FF9EFDEB8340FC30FB21.taxon	discussion	Remarks Potential secondary homonym of Arca modesta Winchell, 1863, which was placed in Parallelodon by Moore (1928: 28) and in Grammatodon by Paul (1941: 121).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF91FF9EFDE08588FE86F8BA.taxon	description	Original source Hyde (1953): 302, pl. 41 figs 1 – 2.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF91FF9EFDE08588FE86F8BA.taxon	materials_examined	Type stratum and age “ Byer member, Logan formation ”; earliest Osagean (upper Tournaisian), Mississippian, Carboniferous (Matchen & Kammer 2006). Type locality “ Sciotoville ”, Ohio, United States of America. Type material Figured specimens (“ cotypes ”) and additional material are part of the Hyde collection (no. 752) and of the Ohio State University collection (no. 19670). All specimens are stored at Ohio State University, Columbus.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF91FF9FFD868665FBEFFD5A.taxon	description	Original source Barrois (1882): 338, pl. 17 fig. 2 a – b.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF91FF9FFD868665FBEFFD5A.taxon	materials_examined	Type stratum and age “ Assise de Sama ”; probably Westphalian (Bashkirian to Moscovian, Pennsylvanian), Carboniferous (after Malvesy et al. 2000). Type locality Mosquitera (Asturias), Spain. Type material Syntypes are a LV and a RV (MGL 4982 (1 – 2 )), stored at Musée d’Histoire naturelle de Lille (Malvesy et al. 2000).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF91FF9FFD868665FBEFFD5A.taxon	discussion	Remarks As Parallelodon monreali in the collection catalogue of Malvesy et al. (2000).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF90FF9FFDE28245FE22FA7F.taxon	description	Original source Ragozin (1931): 6, pl. 1 fig. 1, pl. 3 figs 1 – 4, 12, pl. 4 figs 1 b, 2.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF90FF9FFDE28245FE22FA7F.taxon	materials_examined	Type stratum and age Lower Balakhonka [Balakhonskaya] Formation, Upper Pennsylvanian, Carboniferous (Amler & Silantiev 2022). Type locality “ Pravyy bereg reki Mrassu, v dvukh kilometrakh vyshe ulusa Kameshok ” [right bank of the river Mrassu, two kilometres above the Kameshok locality]; Kuznetsk Basin, West Siberia, Russia. Type material Not traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF90FF9FFDE28245FE22FA7F.taxon	discussion	Remarks Betekhtina (1966) classified the species in the freshwater genus Kinerkaella (Myalinida: Prokopievskiidae).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF90FF98FDCC84A2FE6CFEC9.taxon	description	Original source Gemmellaro (1892): 7.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF90FF98FDCC84A2FE6CFEC9.taxon	materials_examined	Type stratum and age “ Calcare grossolano con Fusulina ”; Wordian to upper Permian (Sanfilippo et al. 2017). Type locality “ Pietra di Salomone ”; 3 km S of Palazzo Adriano, Palermo, Italy. Type material Type material of other parallelodontid species described by Gemmellaro (1892) is stored at the Museo Geologico Università Palermo, Italy; material of M. multilamellatus seems to be missing though.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF90FF98FDCC84A2FE6CFEC9.taxon	discussion	Remarks Only briefly described in Gemmellaro (1892: 7); extended description and illustration in Gemmellaro (1896: 25, pl. 21 fig. 4).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF97FF98FE1980D0FB43FBF2.taxon	description	Original source De Koninck (1885): 144, pl. 21 figs 16 – 18.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF97FF98FE1980D0FB43FBF2.taxon	materials_examined	Type stratum and age “ calcaire carbonifère de Visé (étage III) ”; V 3 b and V 3 c, Visean, Mississippian, Carboniferous (Demanet 1958: 29; Godefroid et al. 2006). Type locality “ Visé ”; quarries south of Visé, on the east side of the Meuse River valley (Demanet 1958; Godefroid et al. 2006), Belgium. Type material The illustrated syntype is stored at the Royal Belgian Institute of Natural Sciences, Brussels, coll. no. RBINS a 4662 (old no. 1171; coll. de Ryckholt).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF97FF98FE1980D0FB43FBF2.taxon	discussion	Remarks Junior synonym of Parallelodon haimeanus (De Koninck, 1851) according to Amler (1987).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF97FF98FDF0853DFC05F8CC.taxon	description	Original source Girty (1909 b): 39, pl. 3 figs 4, 4 a, 5.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF97FF98FDF0853DFC05F8CC.taxon	materials_examined	Type stratum and age “ Caney shale ”; Kinderhookian? to Chesterian?, Middle Mississippian, Carboniferous (boundaries not clear). Type locality “ Atoka quadrangle (station 2089), Tishomingo quadrangle (station 2085) ”; the localities are further detailed in the appendix as: “ Atoka quadrangle, NE. 1 / 4 SE. 1 / 4 sec. 35, T. 2 S., R. 8 E. Caney shale (near top of chert) ” and “ Tishomingo quadrangle, ravine a short distance (one-eighth mile) west of Viola ”; Oklahoma, United States of America. Type material Syntypes (USNM PAL 120754, 120742) are stored at the Smithsonian National Museum of Natural History, Paleobiology Collection, Washington, D. C.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF97FF98FDF0853DFC05F8CC.taxon	discussion	Remarks Mentioned by Aleksandri-Sadova (1965) and Hoare et al. (1989).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF96FF99FDFE8043FD02FC40.taxon	description	Original source Girty (1909 a): 423, pl. 31 figs 13 – 14 a.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF96FF99FDFE8043FD02FC40.taxon	materials_examined	Type stratum and age “ Middle of Capitan formation [...]; Delaware Mountain formation ”; Guadalupian, Permian. Type locality Capitan Peak (station 2926?); [...] Guadalupe Point (station 2931), Guadalupe Mts, Texas. [...] Comanche Canyon, Glass Mts, Texas (station 3763). The stations are further specified on p. 511 – 512 as: “ 2926. Guadalupe Mountains, Texas. Just below knob on crest of spur running northward from El Capitan. Part of material from horizon above or below. About 1,000 feet below summit of El Capitan and the top of the Capitan limestone. ”; “ 2931. Guadalupe Mountains, Texas. West side of road at entrance to Guadalupe Canyon. Lower half of the Delaware Mountain sandstone; opposite to station 2903 and at about the same horizon, possibly above. ”; “ 3763. Big Bend, Texas. Comanche Canyon, Glass Mountains, 17 miles northeast of Marathon, Tex. ”, United States of America. Type material Syntypes (USNM PAL 118224) are stored at the Smithsonian National Museum of Natural History, Paleobiology Collection, Washington, D. C.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF96FF99FDD08568FD5BF9DA.taxon	description	Original source De Koninck (1885): 160, pl. 24 fig. 38.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF96FF99FDD08568FD5BF9DA.taxon	materials_examined	Type stratum and age “ calcaire carbonifère de Visé (étage III) ”; V 3 b and V 3 c, Visean, Mississippian, Carboniferous (Demanet 1958: 29; Godefroid et al. 2006). Type locality “ Visé ”; quarries south of Visé, on the east side of the Meuse River valley (Demanet 1958; Godefroid et al. 2006), Belgium. Type material The illustrated syntype is stored at the Royal Belgian Institute of Natural Sciences, Brussels, coll. no. RBINS a 4721 (old no. 966; coll. de Ryckholt).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF96FF9AFDF487C5FB3DFDBA.taxon	description	Original source Yakovlev (1903): 11 [Russian], 35 [German], pl. 2 fig. 18.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF96FF9AFDF487C5FB3DFDBA.taxon	materials_examined	Type stratum and age “ Dolomitsuite, salzführende Ablagerungen der Mulde von Bachmut ”; lower Permian, potentially Artinskian, following Koken (1901: 309). Type locality “ Pokrowskoje, Donez-Bassin, Mulde von Bachmut ”; Pokrovs’ke, Bakhmut, Donetsk Oblast, Ukraine. Type material Yakovlev (1903) indicated in the plate caption the figured syntype to be stored at the “ Geologicheskiy komitet / Geologische Comité ” (today Academician F. N. Chernyshev Central Geological Research Museum (TsNIGR museum), St Petersburg, Russia), but specimens not yet traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF95FF9AFDFC85EBFD00F88C.taxon	description	Original source Herrick (1888 b): 36, pl. 4 fig. 19.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF95FF9AFDFC85EBFD00F88C.taxon	materials_examined	Type stratum and age “ Keokuk and Burlington Groups. Upper Waverly. (Upper Logan) ”; all units are Osagean in age (Tournaisian – Visean), Mississippian, Carboniferous (Thompson 2001; Matchen & Kammer 2006). Type locality “ Near Newark, O. [Ohio], about 60 or 70 feet above congl. II in our division III ”, United States of America. Type material Not traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF95FF9AFDFC85EBFD00F88C.taxon	discussion	Remarks Classified as Parallelodon by Girty (1911).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF95FF9AFD9B8365FAD2FBC4.taxon	description	Original source Hall (1885): 493, pl. 96 fig. 6.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF95FF9AFD9B8365FAD2FBC4.taxon	materials_examined	Type stratum and age “ Upper part of the Chemung group ”; Brallier Formation, Upper Devonian (Berg et al. 1993). Type locality “ Warren, Pa. ” [Warren, Pennsylvania], United States of America. Type material Not traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF95FF9AFD9B8365FAD2FBC4.taxon	discussion	Remarks Amler & Friedel (2025) doubt affinities to parallelodontids as there are no hinge characters preserved.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF95FF9BFDFE861CFE2AFCB6.taxon	description	Original source Stuckenberg (1905): 84 [Russian], 136 [German], pl. 10 fig. 24 a – b.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF95FF9BFDFE861CFE2AFCB6.taxon	materials_examined	Type stratum and age “ Bellerophon-Horizonte ” (Krasnoufimian beds of the Ural after Waterhouse 1987: 214; the Krasnoufimian was considered synonymous with the Artinskian substage Saranin by Waterhouse 1997), Cisularian, Permian. Type locality “ Samarskaya Luka, Tsarev Kurgan [...], selo Kostychi [...], Kapitanskiy ovrag’ “; Samara Oblast, Russia. Type material Not traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF95FF9BFDFE861CFE2AFCB6.taxon	discussion	Remarks Misspelt as M. noinskyi by Maslennikov (1935: 87). Waterhouse (1987) briefly referred to the species (as Parallelodon).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF94FF9BFDE9827AFBBFFAEF.taxon	description	Original source De Koninck (1885): 145, pl. 21 figs 19 – 21.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF94FF9BFDE9827AFBBFFAEF.taxon	materials_examined	Type stratum and age “ carbonifère des Pauquys et d’Anseremme (étage II) ”; Waulsort Formation, upper Tournaisian, Carboniferous. Type locality “ Pauquys, Anseremme ”; Hastière and Dinant, Namur, Wallonia, Belgium. Type material The illustrated syntype is stored at the Royal Belgian Institute of Natural Sciences, Brussels, coll. no. RBINS a 4663 (old no. 638). Additional syntypes are stored in Brussels.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF94FF94FD928431FCF2FDB5.taxon	description	Original source De Koninck (1842): 114, pl. 2 fig. 16 a – d.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF94FF94FD928431FCF2FDB5.taxon	materials_examined	Type stratum and age “ calcaire de Visé ” (De Koninck 1842); specified as “ calcaire carbonifère de Visé (étage III) ” by De Koninck (1885); V 3 b and V 3 c, Visean, Mississippian, Carboniferous (Demanet 1958: 29; Godefroid et al. 2006). Type locality “ Visé ”; quarries south of Visé, on the east side of the Meuse River valley (Demanet 1958; Godefroid et al. 2006), Belgium. Type material Syntypes are stored at the collections of the Géologie de l’Université Lyon. A BV specimen (UBCL-EM 35409) is figured on pl. 2 fig. 16 a – b. Syntype UBCL-EM 35410, also a BV specimen, is not figured. The whereabouts of the specimen figured on pl. 2 fig. 16 c – d is unknown.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF94FF94FD928431FCF2FDB5.taxon	discussion	Remarks De Koninck (1885) placed this species in Parallelodon.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9BFF94FDC88365FD52FAF1.taxon	description	Original source Lesley (1889): 448, fig. 15.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9BFF94FDC88365FD52FAF1.taxon	materials_examined	Type stratum and age “ Chemung Group ”, Brallier Formation, Upper Devonian (Berg et al. 1993). Type locality “ Hill north of Warren, Warren county, Pennsylvania ”, United States of America. Type material Lesley (1889: 839) mentioned that P. obsoleta based on Randall’s specimen no. 9622 (wrongly labelled as Yoldia). It is stored in the collection of the Geological Survey of Pennsylvania.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9BFF94FDC88365FD52FAF1.taxon	discussion	Remarks The species was first introduced in Lesley’s (1889) dictionary of the fossils from Pennsylvania. Lesley referred to descriptions by G. B. Simpson in the Transactions of the American Philosophical Society, which were presented at a society’s meeting in 1888 but not published before 1890. However, Lesley (1889: viii) stated that the description and illustration were prepared by Simpson, making him the author of the species. Chadwick (1935: 330) classified the species in the genus Prorhynchus. Amler & Friedel (2025) suggested an affiliation to Parallelodon.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9BFF95FDC58438FB64FD9D.taxon	description	Original source Hayasaka (1925): 18, pl. 8 figs 15 – 16.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9BFF95FDC58438FB64FD9D.taxon	materials_examined	Type stratum and age “ Kuro zone ” (i. e., Yabeina globosa zone) of the Akasaka Limestone, Kazanian (Hayami & Kase 1977; Prinoth & Posenato 2023), Guadalupian, Permian. Type locality “ Kinshô-zan, Akasaka-Machi, prov. Mino ”; Kinshozan, Akasaka-cho, Fuwa-gun, Gifu Prefecture, Honshu, Japan. Type material Hayasaka mentioned two specimens, a LV “ almost completely freed from the matrix ”, on which he based most of the description, and another LV embedded in sediment. He did not indicate a holotype. Hanzawa et al. (1961: 269) listed a specimen stored at Institute of Geology and Paleontology (today Department of Earth Science), Tohoku University, Japan (IGPS no. 22392) incorrectly as the “ holotype ”. Hayami & Kase (1977) noted this mistake but stated that “ their treatment is here regarded as constituting lectotype designation. ” However, according to Art. 74.5 a subsequent use of the term “ holotype ” does not constitute a valid lectotype designation. To serve nomenclatural stability, we formally designate here the same specimen (IGPS no. 22392) as the lectotype.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9BFF95FDC58438FB64FD9D.taxon	discussion	Remarks Placed in Grammatodon (Cosmetodon) by Yancey (1985) and Prinoth & Posenato (2023).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9AFF95FD908469FDA4F868.taxon	description	Original source Phillips (1836): 210, pl. 5 fig. 19.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9AFF95FD908469FDA4F868.taxon	materials_examined	Type stratum and age Top of Lower Scar Limestones; probably Great Scar Limestone, Visean, Mississippian, Carboniferous (Phillips 1836: 241; Amler 1987: 160). Type locality “ Bolland ”; south of Ogden Reservoir, west of Queensbury, Bradford, West Yorkshire, United Kingdom. Type material The whereabouts of the material are unknown (Hind 1897: 168).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9AFF95FD908469FDA4F868.taxon	discussion	Remarks Placed in Parallelodon by De Koninck (1885). Note that De Koninck used a broad species concept, resulting in morphologically very different specimens being identified as Parallelodon obtusus (Hind 1897: 168; Amler 1987: 160).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9AFF95FD9E830CFEF3FB46.taxon	description	Original source Meek (1871): 71.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9AFF95FD9E830CFEF3FB46.taxon	materials_examined	Type stratum and age “ Lower coal measures ”; Pennine Lower Coal Measures Formation, Moskovian, Pennsylvanian, Carboniferous. Type locality “ Mongongalia County, W. Va. ” [Mongongalia County, West Virginia], United States of America. Type material Syntypes (coll. no. USNM PAL 7588) are stored at the Smithsonian National Museum of Natural History, Paleobiology Collection, Washington, D. C. (see also Schuchert 1905).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9AFF95FD9E830CFEF3FB46.taxon	discussion	Remarks Placed in Parallelodon by several authors (e. g., Girty 1909 a; Morningstar 1922; Hoare 1961; Hoare et al. 1979).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF99FF96FE23828BFB89F92A.taxon	description	Original source Murchison et al. (1845): 314, pl. 20 fig. 3; originally as “ Oreliana ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF99FF96FE23828BFB89F92A.taxon	materials_examined	Type stratum and age “ dans les calcaires jaunes dévoniens ”; in the yellow Devonian limestones; presumably upper Famennian, uppermost Devonian (according to Lebedev et al. 2018). Type locality “ de Novazilskaya, à trois verstes au sud d’Orel ” [from Novazilskaya, three versts [~ 3 km] south of Oryol]; locality not found, today probably within the city limits of Oryol (Oryol oblast), Russia. Type material Not traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF99FF96FE23828BFB89F92A.taxon	discussion	Remarks Listed (as Arca) also by Venyukov (1886: 161, pl. 8 figs 6 – 7), Nalivkin (1947: 136, pl. 34 fig. 1; there authorship attributed to Venyukov 1886) and Lebedev et al. (2018: 63). Based on the morphology Amler & Friedel (2025) suggested a probable affiliation with Parallelodon.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF99FF96FD878043FB0BFC24.taxon	description	Original source Grabau (1931): 321, pl. 32 fig. 14 a – b.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF99FF96FD878043FB0BFC24.taxon	materials_examined	Type stratum and age “ In the Martinia bed (1194) of the Jisu Honguer limestone ”; Zhesi Formation, Wordian – Capitanian, middle Permian (Ren et al. 2020). Type locality “ Jisu Honguer ”, Mongolia. Type material Grabau mentioned the holotype as the only available specimen, it is a RV (no. 483, Cat. G. S. C. 1505), stored in the Museum of the Geological Survey of China (today Geological Museum of China), Beijing.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF99FF96FD878043FB0BFC24.taxon	discussion	Remarks Placed in Parallelodon by Gu et al. (1976); also listed as such by Gao & Jiang (1998).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF99FF97FDC087F5FACFFD96.taxon	description	Original source De Koninck (1885): 161, pl. 24 figs 1 – 2, pl. 25 figs 3, 30.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF99FF97FDC087F5FACFFD96.taxon	materials_examined	Type stratum and age “ calcaire carbonifère de Visé (étage III) ”; V 3 b and V 3 c, Visean, Mississippian, Carboniferous (Demanet 1958: 29; Godefroid et al. 2006). Type locality “ Visé ”; quarries south of Visé, on the east side of the Meuse River valley (Demanet 1958; Godefroid et al. 2006), Belgium. Type material The illustrated syntypes are stored at the Royal Belgian Institute of Natural Sciences, Brussels, coll. no. RBINS a 4724 (old no. 1033; pl. 24 figs 1 – 2; coll. de Ryckholt) and RBINS a 4725 (old no. 970; pl. 25 fig. 3; coll. De Koninck). Specimen RBINS a 4726 (old no. 956; pl. 25 fig. 30) does not match the figure.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF98FF97FDEE8442FC83F827.taxon	description	Original source Hall & Whitfield (1869): 15.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF98FF97FDEE8442FC83F827.taxon	materials_examined	Type stratum and age “ Yellow sandstone ”; Waverly Group according to Driscoll (1965), but uncertain from which horizon / formation. The Waverly Group comprises Upper Devonian to Lower Mississippian formations (Clayton et al. 1998). Type locality “ Granville, Licking county, Ohio ”, United States of America. Type material A syntype (AMNH-FI- 6556) is stored at the American Museum of Natural History, New York.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF98FF97FDEE8442FC83F827.taxon	discussion	Remarks As Parallelodon (Cosmetodon) in Driscoll (1965: 98).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF98FF97FE30831AFBF3FB5F.taxon	description	Original source De Koninck (1885): 152, pl. 26 figs 2 – 3.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF98FF97FE30831AFBF3FB5F.taxon	materials_examined	Type stratum and age “ calschiste de Tournai (étage I) ”; Tn 3 a and Tn 3 b, lower Ivorian, Tournaisian, Carboniferous (Demanet 1958; Sartenaer & Plodowski 1996; Poty et al. 2002; Godefroid et al. 2006). Type locality “ Tournai ”; Hainaut Province, Belgium. Type material The illustrated syntype is stored at the Royal Belgian Institute of Natural Sciences, Brussels (RBINS a 4694; old no. 254; coll. de Ryckholt).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF98FF97FE30831AFBF3FB5F.taxon	discussion	Remarks Junior secondary homonym of Parallelodon ovatus (Hall & Whitfield, 1869).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9FFF90FEF1828BFC2CFA5C.taxon	description	Original source Astafieva-Urbajtis & Ramovš (1985): 13, pl. 1 figs 6 a – b, 9.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9FFF90FEF1828BFC2CFA5C.taxon	materials_examined	Type stratum and age “ verkhniy karbon, gzhel’skiy yarus ”; Auernig Formation, Gzhelian, Carboniferous. Type locality “ Yugoslaviya, gory Karavanke [...] Križovec 1 (Črni vrh) ”, Karavanke Mts, Slovenia. Type material Type material is stored at the Gornjesavski muzej Jesenice, Slovenia, formerly Technical Museum of zelezarne Jesenica. Holotype with coll. no. USMJ 882, additionally figured specimen (“ topotype ”) with coll. no. USMJ 879; further material mentioned by the author.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9FFF90FDE68043FC69FC24.taxon	description	Original source Caster (1930): 203 [61], pl. 44 [23] fig. 5.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9FFF90FDE68043FC69FC24.taxon	materials_examined	Type stratum and age “ sandstone, below the Olean conglomerate ”; Lower Mississippian, Carboniferous (Berg et al. 1993). Type locality “ hill south of Smethport, Pa. ” (in McKean County, Pennsylvania) is mentioned in the text, but plate caption gives “ Glade, Pa. ” (probably Warren County), United States of America. Type material Studied material (coll. no. 5234) is stored in the paleontological collection of Cornell University, Ithaca, New York. There seems to be only a steinkern of a RV as the base of this species.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9FFF90FDE68043FC69FC24.taxon	discussion	Remarks Listed as Prorhynchus peneplanum [sic] by Chadwick (1935: 333).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9FFF91FDE48743FCDAFDBA.taxon	description	Original source Prantl & Růžička (1955 a): 304 [Czech], 310 [Russian], 314 [English], pl. 1 figs 1 – 3; genus originally as Šufia.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9FFF91FDE48743FCDAFDBA.taxon	materials_examined	Type stratum and age “ Choteč Limestones - gγ 2, Middle Devonian ”. Type locality “ Holyně, west of Prague, Bohemia ”, Czech Republic. Type material The holotype, the only specimen, is damaged and incomplete. No information of storage provided.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9FFF91FDE48743FCDAFDBA.taxon	discussion	Remarks Prantl & Růžička (1955 a) provided a detailed description and already discussed similarities with Parallelodon. Newell (1969: 256) tentatively synonymised Sufia with Parallelodon. Amler & Friedel (2025) discussed cyrtodontid or parallelodontid affinities.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9EFF91FE3C8365FEE7FACD.taxon	description	Original source Lesley (1889): 448, fig. 14.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9EFF91FE3C8365FEE7FACD.taxon	materials_examined	Type stratum and age “ Chemung Group ”, Brallier Formation, Upper Devonian (Berg et al. 1993). Type locality “ Hill north of Warren, Warren county, Pennsylvania ”, United States of America. Type material Lesley (1889: 332) mentioned L. parallelum as specimen no. 9610 of Randall’s collection (erroneously labelled as Cypricardia). It is stored in the collection of the Geological Survey of Pennsylvania.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9EFF91FE3C8365FEE7FACD.taxon	discussion	Remarks The species was first introduced in Lesley’s (1889) dictionary of the fossils from Pennsylvania. Lesley referred to descriptions by G. B. Simpson in the Transactions of the American Philosophical Society, which were presented at a society’s meeting in 1888 but not published before 1890. However, Lesley (1889: viii) stated that the description and illustration were prepared by Simpson, making him the author of the species. Chadwick (1935: 330) classified the species in the genus Prorhynchus, McAlester (1962) only stated that this species is not a Leptodesma. Amler & Friedel (2025) suggested an affiliation to Parallelodon.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9EFF92FDF284DDFCB1FDDB.taxon	description	Original source Amler (1987): 152, pl. 5 figs 7 – 8, text-figs 25 – 26.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9EFF92FDF284DDFCB1FDDB.taxon	materials_examined	Type stratum and age “ Kalkschiefer-Brekzie von Königsberg, cd III α 3 - 4 / cd III βstr? = V 3 b γ / V 3 c inf.? (Warnantium) ”; Warnantian substage, upper Visean, Mississippian, Carboniferous (Poty & Hance 2006). Type locality “ Aufschluss am Stollen-Eingang ‘ Schieferkaut’, östliche Seite des oberen Strupbach-Tales, 555 m östlich von Schloss Königsberg; Bl. 5317 Rodheim-Bieber; R 6 7800, H 12280 oder kleiner Steinbruch am Waldweg zwischen Königsberg und den ‘ Lindenhöfen’ oberhalb der Fischteiche, 220 m nordwestlich von Schloss Königsberg; BI. 5317 Rodheim-Bieber; R 67050, H 12430. – Parkinson gibt nicht an, von welchem der beiden ihm bekannten Fundorte, die etwa 700 m voneinander entfernt liegen, die Bivalvenreste stammen. ” [Outcrop at the entrance to the ‘ Schieferkaut’ mining tunnel, eastern side of the upper Strupbach valley, 555 m east of Königsberg Castle; map sheet 5317 Rodheim-Bieber; R 6 7800, H 12280 or small quarry on the forest path between Königsberg and the ‘ Lindenhöfe’ above the fish ponds, 220 m northwest of Königsberg Castle; map sheet 5317 Rodheim-Bieber; R 67050, H 12430. – Parkinson did not specify from which of the two sites known to him, which are about 700 m apart, the bivalve remains originate.]; Biebertal-Königsberg NW of Giessen, Hesse, Germany. Type material Holotype (steinkern of a LV, SMF. Mbg. 3651) and several paratypes (three steinkerns of two LV and one RV, SMF. Mbg. 3233, SMF. Mbg. 4005, SMF. Mbg. 4006), all stored at the Senckenberg Research Institute and Natural History Museum, Frankfurt am Main.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9DFF92FDD383C6FD64FAA3.taxon	description	Original source White & Whitfield (1862): 299.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9DFF92FDD383C6FD64FAA3.taxon	materials_examined	Type stratum and age “ Chemung Group ”; Upper Devonian. Type locality “ Burlington, Iowa ”, United States of America. Type material Syntypes (AMNH-FI- 35930, AMNH-FI- 35929) are stored at the American Museum of Natural History, New York.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9DFF92FDD383C6FD64FAA3.taxon	discussion	Remarks As Parallelodon parvus in species lists in Moore (1928). The Triassic Makrodon [sic] parvum [sic] Hofmann, 1873 is a junior primary homonym.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9DFF92FDEB840EFD15F811.taxon	description	Original source Friedel & Amler (2024): 516, fig. 4 a – d.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9DFF92FDEB840EFD15F811.taxon	materials_examined	Type stratum and age “ Strunium, Etroeungt Formation, uppermost Famennian (equivalent to Wocklum Stage), Devonian ”. Type locality “ River valley Angerbach, Ratingen near Düsseldorf, North Rhine-Westphalia ”, Germany. Type material Holotype (SMF. Mbg. 3029) is a BV steinkern, which is also figured by Drevermann (1902: pl. 14 fig. 9) as Macrodus semicostatus McCoy. Paratypes are a steinkern of a LV (SMF. Mbg. 3028), also figured by Drevermann (1902: pl. 14 fig. 8) and a steinkern of a RV (BGR-B X 13470). Stored at the Senckenberg Research Institute and Natural History Museum, Frankfurt am Main, and Bundesanstalt für Geowissenschaften und Rohstoffe, Berlin.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9CFF93FDEF82DCFB09F995.taxon	description	Original source d’Orbigny (1850): 165.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9CFF93FDEF82DCFB09F995.taxon	materials_examined	Type stratum and age “ Zechsteindolomit von Könitz ”; Zechstein Group, Zechstein 1 (reef facies) Series, Werra Formation, Wuchiapingian, Lopingian, Permian (Geinitz 1848; Friedel et al. 2025). Type locality “ Könitz bei Saalfeld in Thüringen ” [Könitz near Saalfeld, Thuringia] (Geinitz 1848), Germany. Type material Whereabouts unknown.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9CFF93FDEF82DCFB09F995.taxon	discussion	Remarks D’Orbigny erected A. permiana for a specimen with smooth shell that had been determined as A. kingiana by Geinitz (1848: 9, pl. 4 fig. 8); junior synonym of P. zerrenneri (Friedel et al. 2025).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9CFF93FDE68043FCDBFCD2.taxon	description	Original source Mather (1915): 214, pl. 15 fig. 6.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9CFF93FDE68043FCDBFCD2.taxon	materials_examined	Type stratum and age “ Brentwood limestone ”; Brentwood Limestone Member, Bloyd Formation, Bashkirian (Morrowan), Pennsylvanian, Carboniferous (Xie et al. 2018). Type locality “ near Fayetteville, Arkansas (Station 135) ”; the station is further specified on p. 247 as “ Fayetteville quadrangle: Brentwood limestone lentil. Three and a half miles northeast of Fayetteville, Ark. Abandoned quarry. S. 1 / 2, sec. 2, T. 16 N., R. 30 W. ”, United States of America. Type material Holotype (FMNH UC 16061) stored at the Field Museum of Natural History, Chicago (formerly Walker Museum, University of Chicago, as indicated by Mather).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9CFF8CFDD58705FEF2FE25.taxon	description	Original source De Koninck (1885): 155, pl. 25 figs 33 – 35.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF9CFF8CFDD58705FEF2FE25.taxon	materials_examined	Type stratum and age “ calcaire carbonifère des Pauquys (étage II) ”; Waulsort Formation, upper Tournaisian, Mississippian, Carboniferous. Type locality “ Pauquys ”; Hastière, Namur, Wallonia, Belgium. Type material The illustrated syntypes are stored at the Royal Belgian Institute of Natural Sciences, Brussels, coll. no. RBINS a 4701 (old no. 761; pl. 25 fig. 33; coll. Dupont) and RBINS a 4702 (old no. 764; pl. 25 figs 34 – 35).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF83FF8CFD978518FCF2F896.taxon	description	Original source De Koninck (1842): 116, pl. 2 fig. 11 a – b.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF83FF8CFD978518FCF2F896.taxon	materials_examined	Type stratum and age “ calcaire de montagne de Visé ”; V 3 b and V 3 c, Visean, Mississippian, Carboniferous (Demanet 1958: 29; Godefroid et al. 2006). Type locality “ Visé ”; quarries south of Visé, on the east side of the Meuse River valley (Demanet 1958; Godefroid et al. 2006), Belgium. Type material The syntypes are stored in the collection of the Géologie de l’Université Lyon. None of the specimens match the figure. UCBL-EM 35387 and UCBL-EM 35388 are both BV and eligible. Additional, not figured syntypes are UCBL-EM 35389 and UCBL-EM 35390.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF83FF8CFD978518FCF2F896.taxon	discussion	Remarks De Koninck (1885) placed this species in Parallelodon.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF83FF8CFDD980F5FCF4FB91.taxon	description	Original source Miller & Gurley (1896): 10, pl. 2 figs 17 – 18.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF83FF8CFDD980F5FCF4FB91.taxon	materials_examined	Type stratum and age “ Chouteau limestone ”; Kinderhookian, Mississippian, Carboniferous (Thompson 2001). Type locality “ near Sedalia, Missouri ”, United States of America. Type material Stored at the Cincinnati Museum Center, Ohio (formerly University of Cincinnati Museum), with 2 “ cotypes ” (3907 – 3908, coll. Miller; see Chappars 1936).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF83FF8CFDD980F5FCF4FB91.taxon	discussion	Remarks Not found in the literature after the original description.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF83FF8DFE25861AFAD8FD5C.taxon	description	Original source Lutkevich & Lobanova (1960): 29, pl. 2 fig. 4.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF83FF8DFE25861AFAD8FD5C.taxon	materials_examined	Type stratum and age “ Upper Permian ” (middle or upper Permian in the Russian Permian time scale; in the discussion Lutkevich & Lobanova 1960 stated that the deposits come from strata up to the Tatarian, corresponding to the latest middle to upper Permian). Type locality “ Vostochnaya chast’ Zapadnogo Verkhoyan’ya, r. Uyana, v logu naprotiv rch. Bittuchan ” [eastern part of Western Verkhoyansk, Uyana river, in the ravine opposite Bittuchan river]; Sakha Republic, Russia. Type material Holotype stated to be stored at the Academician F. N. Chernyshev Central Geological Research Museum (TsNIGR museum), St Petersburg, Russia (coll. no. 25 / 7443, pl. 2 fig. 4); however, it is not mentioned in the type catalogue of Romanovskaya et al. (1979), who listed other species described in that work.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF82FF8DFDE18243FCADFA62.taxon	description	Original source De Koninck (1873): 84, pl. 3 fig. 16 a – b.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF82FF8DFDE18243FCADFA62.taxon	materials_examined	Type stratum and age Bleiberger Karbon, Nötscher Schichten (Heritsch 1918); Erlachgraben, Badstub and Nötsch Formation, Visean (Mississippian) to Bashkirian (Pennsylvanian), Carboniferous (Schönlaub 1985; Schraut 1996, 1999). Type locality “ Bleiberg ”; Carinthia, Austria. Type material Studied specimen is stored at the Geosphere Austria, Vienna (formerly Geologische Bundesanstalt) under coll. no. 517 (Sieber 1979: A 216).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF82FF8DFDE18243FCADFA62.taxon	discussion	Remarks Junior primary homonym of the extant species Arca plicata Dillwyn, 1817. Placed in Macrodon? by Frech (1892) and in Grammatodon by Paul (1941).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF82FF8EFD92874DFA8AFDFE.taxon	description	Original source Girty (1909 a): 424, pl. 9 fig. 25.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF82FF8EFD92874DFA8AFDFE.taxon	materials_examined	Type stratum and age “ Middle of Capitan formation [...]; Delaware Mountain formation ”; Guadalupian, Permian. Type locality Capitan Peak (station 2926); [...] Guadalupe Point (station 2931), Guadalupe Mts, Texas. [...] southern Delaware Mts, Texas (station 2969?). The stations are further specified on p. 511 – 512 as “ 2926. Guadalupe Mountains, Texas. Just below knob on crest of spur running northward from El Capitan. Part of material from horizon above or below. About 1,000 feet below summit of El Capitan and the top of the Capitan limestone. ”; “ 2931. Guadalupe Mountains, Texas. West side of road at entrance to Guadalupe Canyon. Lower half of the Delaware Mountain sandstone; opposite to station 2903 and at about the same horizon, possibly above. ”; “ 2969. Van Horn quadrangle, about 30 miles northeast of Van Horn, in the Delaware Mountains. Same as station 3500 [About 15 miles north of Jones’s ranch, Delaware Mountains, 4800 - foot hill]. ”, United States of America. Type material Holotype (USNM PAL 118225) is stored at the Smithsonian National Museum of Natural History, Paleobiology Collection, Washington, D. C. Additional material was mentioned by Girty (1909 a).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF81FF8EFDD28321FC1DFAA3.taxon	description	Original source Spriestersbach (1942): 175, pl. 3 fig. 15.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF81FF8EFDD28321FC1DFAA3.taxon	materials_examined	Type stratum and age “ Ohler Schiefer, Unteres Mitteldevon ”; Brandenberg-Schichten, Eifelian, Middle Devonian (May 1993). Type locality “ Alte Halde bei Koppelweide im Alpetal; Blatt Wiehl ” [old dump near Koppelweide, northern of Alpe, map sheet Wiehl]; North Rhine-Westphalia, Germany. Type material Holotype (BGR-B-ORIG- 000183071) is the figured LV; additionally, Spriestersbach mentioned three internal moulds; holotype is stored at the Bundesanstalt für Geowissenschaften und Rohstoffe, Berlin.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF81FF8EFDD28321FC1DFAA3.taxon	discussion	Remarks Based on the general shell morphology, Amler & Friedel (2025) discussed its potential affiliation to Parallelodon, but the diagnostic hinge characters are unknown.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF81FF8EFDE6840EFC15F868.taxon	description	Original source Prantl & Růžička (1955 b): 5 [Russian], 13 [English], pl. 1 figs 1 – 3; originally as “ přibyli ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF81FF8EFDE6840EFC15F868.taxon	materials_examined	Type stratum and age “ Choteč Limestones - gγ 2 (Middle Devonian) ”. Type locality “ Holyně near Prague ”, Czech Republic. Type material The holotype, the only specimen, is damaged and incomplete. No information of storage provided.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF81FF8EFDE6840EFC15F868.taxon	discussion	Remarks Prantl & Růžička (1955 b) provided a detailed description and assumed an affiliation to the family Pseudocyrtodontidae; Newell (1969: 256) tentatively synonymised Mnataia with Parallelodon. Amler & Friedel (2025) assumed cyrtodontid or parallelodontid affinities.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF80FF8FFDBC8043FD16FBBF.taxon	description	Original source Goldfuss (1833 – 1841): 283, pl. 160 fig. 10.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF80FF8FFDBC8043FD16FBBF.taxon	materials_examined	Type stratum and age “ Uebergangskalk ”; Visean, lower Carboniferous (Paul 1941: 124). Type locality “ Grafschaft Glatz ” [Powiat Kłodzki]; Lower Silesian Voivodeship, Poland. Type material Shell and steinkern of a LV (BIOB-PAL-GF 1026). Stored at the Goldfuss-Museum of the University Bonn.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF80FF8FFDBC8043FD16FBBF.taxon	discussion	Remarks Whidborne (1897: 113, pl. 12 fig. 6) attributed A. prisca to the genus Parallelodon. However, the specimens which Whidborne based this decision on were considered misidentified by Friedel & Amler (2024), who introduced a new species, Parallelodon pauli. Paul (1941) placed the species in Grammatodon, and Kakhadze (1942: 232 – 233) stated the species “ undoubtedly belongs to the genus Parallelodon ” (translated from Georgian).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF80FF8FFDFE8562FA87F906.taxon	description	Original source Whiteaves (1892): 299, pl. 39 figs 2 – 3.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF80FF8FFDFE8562FA87F906.taxon	materials_examined	Type stratum and age “ Upper Devonian […]; Stringocephalus zone ”; Givetian, Middle Devonian (Schumacher 1971). Type locality “ Lake Winnipegosis, on the north-western shore, at Devils Point, [..] at Dawson Bay, on the south-east side, on a small island to the south-west of Whiteaves Point, and on the south-west side, at the mouth of Steep Rock River ”, southern Manitoba, Canada. Type material Whereabouts of types unknown (compare Bailey 1986: 322).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF80FF8FFDFE8562FA87F906.taxon	discussion	Remarks Listed as Parallelodon in Whidborne (1896 – 1897); mentioned but not discussed by Amler (1995).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF80FF88FE3287AAFB4BFD03.taxon	description	Original source Gu et al. (1976): 123, pl. 11 figs 5 – 7.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF80FF88FE3287AAFB4BFD03.taxon	materials_examined	Type stratum and age Nuoyinhe Group, upper Permian (Zhang 2009). Type locality Delingha, Qaidam Basin, Qinghai; near Yikebiquesi, upper Bayin River, China. Type material See Parallelodon reticulatus Shih in Fan et al. (1962).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF80FF88FE3287AAFB4BFD03.taxon	discussion	Remarks Replacement name for the secondary homonym Parallelodon reticulatus Shih in Fan et al., 1962, non McCoy, 1844. Gu et al. (1976) wrote (translated from Chinese): “ The original name of this species was Parallelodon reticulatus (Fan Jiasong et al., 1962). Because the species name is repeated with P. reticulatus (McCoy, 1844 in Hind 1896 – 1900), a new name was established. ” The species was considered a senior synonym of Parallelodon longjiuensis Guo, 1985 by Yang et al. (2016).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF87FF88FD9A83AEFB6EFAF1.taxon	description	Original source Chao (1927): 10, pl. 1 figs 11 – 13.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF87FF88FD9A83AEFB6EFAF1.taxon	materials_examined	Type stratum and age “ Spirifer taiyuanensis zone, Houkou limestone, Lincheng coal field ”; Houkou limestone, Taiyuan Formation, upper Carboniferous to lower Permian (Fang et al. 2009). Type locality “ Lincheng coal field, S. Chihli (Loc. 158) ”; Lincheng County, Xingtai, Hebei, China. Type material Number of type specimens not indicated, but three syntypes (“ cotypes ”) are illustrated on pl. 1 figs 11 – 13 (inv. no. 1220 – 1222). The syntype with inv. no. 1220 (pl. 1 fig. 11) is also figured by Newell (1969: fig. c 6.2). Fang et al. (2009) referred to this specimen incorrectly as the “ holotype ”. All stored at the Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF87FF88FD868438FAAFF85C.taxon	description	Original source Hall (1883): pl. 79 figs 40 – 49; description on p. 492 appeared in 1885 [there as Prorhynchus quadratum].	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF87FF88FD868438FAAFF85C.taxon	materials_examined	Type stratum and age Upper part of Chemung Group (Hall 1885), Upper Devonian. Type locality Smethport, Pennsylvania, United States of America. Type material Not traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF87FF88FD868438FAAFF85C.taxon	discussion	Remarks Hall (1885) introduced for this species the genus Prorhynchus. Linsley (1994) attributed it to the genus Parallelodon (see also Damborenea 1987). First listed as nomen nudum by Miller (1877: 199).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF86FF89FDEB8238FDCDF946.taxon	description	Original source Paeckelmann (1913): 249, pl. 4 fig. 9.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF86FF89FDEB8238FDCDF946.taxon	materials_examined	Type stratum and age “ Étroeungt ”; Velberter Schichten (Fa 2 d – Tn 1 a), upper Famennian (Strunian), Upper Devonian (Amler 1995). Type locality “ Bahneinschnitt und Wegprofil 200 m sw’ des Blauen Sees, Ratingen-Cromford ” [Railway cutting and section along path 200 m southwest of the Blauer See, Ratingen-Cromford]; near Düsseldorf, North Rhine-Westphalia, Germany. Type material Lectotype (RV, steinkern) designated by Amler (1995) and stored at the Senckenberg Research Institute and Natural History Museum, Frankfurt am Main (coll. no. SMF. Mbg. 3361 = SMF. Mbg. 3029; coll. Drevermann, figured by Paeckelmann 1913: pl. 4 fig. 9 and Amler 1995: pl. 1 fig. 12). Paeckelmann mentioned further material (= paralectotypes); one specimen previously stored at IGP of University of Marburg was transferred to Senckenberg Research Institute and Natural History Museum as well; the whereabouts of the remaining specimens are unknown (Amler 1995).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF86FF89FDEB8238FDCDF946.taxon	discussion	Remarks Declared as a nomen dubium by Amler (1995); later placed as a valid species in Guerichia Rzehak, 1910 (Posidoniidae) by Amler (2004: 165).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF86FF89FDC08043FDA8FCF1.taxon	description	Original source Gonzalez (2006): 136, fig. 5 c – e.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF86FF89FDC08043FDA8FCF1.taxon	materials_examined	Type stratum and age “ Middle member of the Mojón de Hierro Formation, Costatumulus amosi Zone, Asselian to Early Tastubian? ”; Cisuralian, Permian. Type locality “ 4000 m E of puesto Tres Lagunas, Tepuel Hills, Chubut ”, Argentina. Type material The holotype is an external mould of a RV (IPI 2613). Several paratypes are available (IPI 2609, IPI 2612 A, IPI 2612 B, IPI 2613, IPI 2614, IPI 2616, IPI 2617, IPI 2618). All stored at the Fundación Miguel Lillo at Tucumán, Argentina.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF86FF8AFDF2866AFBCCFD27.taxon	description	Original source Mansuy (1914): 36, pl. 4 fig. 4 a – b, pl. 7 fig. 3 a – d.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF86FF8AFDF2866AFBCCFD27.taxon	materials_examined	Type stratum and age Productus limestones, Permian (unspecified horizon). Type locality “ Phnom Ta Kreem ”; west of Battambang, Cambodia. Type material Not traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF86FF8AFDF2866AFBCCFD27.taxon	discussion	Remarks As Parallelodon in Termier & Termier (1959: 277) and Termier et al. (1977: 80).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF85FF8AFD8983F4FE5FFA3D.taxon	description	Original source Hind (1914): 26, pl. 4 figs 12 – 14 a.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF85FF8AFD8983F4FE5FFA3D.taxon	materials_examined	Type stratum and age “ The marine bed of Millstone Grit, Hazel Hill and Clint Quarries. The marine band associated with Glyphioceras spirale at Congleton Edge ”; Namurian (Serpukhovian, Mississippian to Bashkirian, Pennsylvanian), Carboniferous (Waters et al. 2014). Type locality “ Hazel Hill and Clint Quarries. [...] Congleton Edge ” (Hind 1914); additionally, he included in the synonymy list a specimen from Sawley, near Ripon previously misidentified in Hind (1897); Yorkshire and Cheshire, United Kingdom. Type material The illustrated syntypes are stored at the Natural History Museum, London, coll. Hind. Syntypes are a steinkern of a BV specimen from Sawley (NHMUK PI L 47271; pl. 4 fig. 14), an external mould of a RV from Hazel Hill (NHMUK PI L 47770; pl. 4 fig. 13) and a steinkern of a LV from Hazel Hill (NHMUK PI L 47767; pl. 4 fig. 12).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF85FF8AFD8284EDFD0FF863.taxon	description	Original source Reed (1944): 287, pl. 53 fig. 1 – 1 b.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF85FF8AFD8284EDFD0FF863.taxon	materials_examined	Type stratum and age “ Upper Productus Limestone ”; Chhidru Formation (Sameeni 2009), Lopingian, Permian (Henderson & Shen 2020: 889). Type locality “ S. cliffs of Lunwala Wahan, 1 / 2 mile S. S. W. Kumra Devi ”; Lunwala Wahan near Nali, Khushab, Punjab, Pakistan. Type material The holotype, based on a complete and well-preserved shell (GSI type no. 17173 / K 33.318), is stored at the Geological Survey of India, Kolkata.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF84FF8BFD808042FACFFBBE.taxon	description	Original source McCoy (1844): 73, pl. 12 fig. 9.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF84FF8BFD808042FACFFBBE.taxon	materials_examined	Type stratum and age Chadian, lower Visean, Mississippian, Carboniferous (according to the collection label of National Museum of Ireland, Dublin). Type locality “ Millicent, Clane ”, County Kildare (Griffith in McCoy 1862), Ireland. Type material Type series stored at the National Museum of Ireland, Dublin. Lectotype (designated by Hind 1897) is a steinkern with shell preservation (NMING: F 7355) figured by McCoy (1844) and Hind (1897: pl. 12 fig. 1). Additional paralectotypes are NMING: F 7356, NMING: F 5136 and NMING: F 5137; all Griffith collection.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF84FF8BFD808042FACFFBBE.taxon	discussion	Remarks Hind (1897) placed the species in the genus Parallelodon (see also Amler 1987). Note that Shih (in Fan et al. 1962) introduced Parallelodon reticulatus as a secondary synonym of P. reticulatus (McCoy, 1844).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF84FF8BFE0F8561FB04F906.taxon	description	Original source Fan et al. (1962): 146, pl. 1 fig. 2 a – c, text-figs 3 – 4.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF84FF8BFE0F8561FB04F906.taxon	materials_examined	Type stratum and age Nuoyinhe Group, upper Permian (Zhang 2009). Type locality Near Yikebiquesi, upper Bayin [Bayinhe] River, Delingha, Qinghai, China. Type material Holotype is a LV, no. 00406; storage uncertain, probably at the Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF84FF8BFE0F8561FB04F906.taxon	discussion	Remarks Secondary homonym of Byssoarca reticulata McCoy, 1844, which was classified in Parallelodon by Hind (1897). Liu in Gu et al. (1976) introduced P. qinghaiensis as a replacement name.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF84FF84FDEB87AAFCEBFDE9.taxon	description	Original source Worthen (1890): 123, pl. 21 fig. 3, 3 a.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF84FF84FDEB87AAFCEBFDE9.taxon	materials_examined	Type stratum and age “ Coal Measures ”; Sparland Formation, McLeansboro Group, Upper Pennsylvanian, Carboniferous. Type locality “ Rolls Ford, Sangamon county, Illinois ”, United States of America. Type material Syntype (s) is stored at the Illinois State Museum under the coll. no. ISM 2585 (Leary 1971).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF84FF84FDEB87AAFCEBFDE9.taxon	discussion	Remarks Recombined as Parallelodon sangamonensis by Morningstar (1922: 210, pl. 11 figs 3 – 4); also discussed and illustrated in Hoare et al. (1979: 31, pl. 3 figs 9 – 10).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8BFF84FDF48337FCDEFA5D.taxon	description	Original source McCoy (1844): 73, pl. 11 fig. 35.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8BFF84FDF48337FCDEFA5D.taxon	materials_examined	Type stratum and age Middle Limestone or Calp Series (Griffith in McCoy 1862); probably Benbulben Shale Formation of the Tyrone Group (Arundian – Asbian, Visean, Mississippian) (Friedel & Amler 2024), Carboniferous. Type locality “ Manorhamilton, Manorhamilton ”, County Leitrim (Griffith in McCoy 1862), Ireland. Type material Unfortunately, there is no information available on the number of syntypes studied by McCoy. Specimen NMING: F 7357 / A, coll. Griffith, figured by McCoy (1844: pl. 11 fig. 35), Hind (1897: pl. 11 fig. 5), Wilson (1967: pl. 3 fig. 9) and Friedel & Amler (2024: fig. 7 a), was termed as “ the type ” in Hind (1897: 158) and is either holotype by monotypy or lectotype by subsequent designation of Hind (1897). The documents of the National Museum of Ireland, Dublin custodians state: “ The counterparts of this pair of valves were recently noticed on the reverse of the matrix of the lectotype of Serpulites carbonarius (M’Coy), now numbered F 7357 / B. These were not seen by Hind or Wilson as the specimen was glued to a tablet with the annelid uppermost ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8BFF84FDF48337FCDEFA5D.taxon	discussion	Remarks Hind (1897) placed the species in the genus Parallelodon.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8BFF85FDCF874DFE22FEC8.taxon	description	Original source Yanishevsky (1900): 224, pl. 3 fig. 24.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8BFF85FDCF874DFE22FEC8.taxon	materials_examined	Type stratum and age Astafieva-Urbajtis & Ramovš (1985) indicated a Baskhirian (Pennsylvanian, Carboniferous) age, while Mychko et al. (2025), based on a wider assessment of the area, attributed strata around the type locality to the Visean (Mississippian) to Bashkirian (Pennsylvanian), Carboniferous. Type locality Shartymka River, ca 8 km SE of Polyakovka, Bashkortostan Republic, Russia. Type material Type material (KP 426 / 448) is stored at the A. A. Shtukenberg Geological Museum of Kazan Federal University, Kazan.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8AFF85FDD580D7FC32FD44.taxon	discussion	Remarks The name appears first (without authorship) in the Atlas for the paleontological course of Meller & Laguzen (1882, Paleozoologiya, part 2, pl. 2 fig. 15; as Arca (Macrodon) semilarvis), who illustrated a specimen from the Pennsylvanian of the western slope of the Ural Mts. It was also mentioned by Chernyshev (1902), who attributed the species to Keyserling (“ Keys. ”) and referred to it as a replacement name for Macrodon lacordairianum Verneuil, non De Koninck. The original source could not be found; it is unclear, if the species was indeed described earlier by Keyserling. If no older source can be detected, the name would be available from Meller & Laguzen (1882).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8AFF85FD8785BAFABEF8E2.taxon	description	Original source Rakusz (1932): 93, pl. 4 figs 15 – 16.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8AFF85FD8785BAFABEF8E2.taxon	materials_examined	Type stratum and age “ Horizont ζ ”; Upper Carboniferous, probably Moscovian (according to Hyžný et al. 2013). Type locality Dobšiná, “ Michaeli-Grube ”, Slovakia. Type material Not traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8AFF85FD8785BAFABEF8E2.taxon	discussion	Remarks Rakusz attributed the authorship to K. Papp (1919: 121) (as “ Papp, em. aut. ”), who had only listed the name as nomen nudum in a footnote. Not found in the literature after the original description.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8AFF85FE05826BFB1AFB77.taxon	description	Original source Noinsky (1913): 122, 133, 691, 696, 704.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8AFF85FE05826BFB1AFB77.taxon	discussion	Remarks Noinsky (1913) listed the species from the upper Permian (“ Pb 2 ”) below the “ outpost ” at the mouth of the rather large “ Biruchya ” ravine (“ Nizhe ‘ forposta’ u ust’ya dovol’no bol’shogo’ ‘ Biryuch’ya’ ovraga ”) in Samara Oblast (Russia) as new, but he did not describe it. On p. 691 he stated that “ it is very close to the common M. striatum Schloth., and represents, perhaps, only a variation of it ” (translated from Russian). However, this does not constitute a description, hence the name is a nomen nudum Maslennikov (1935) listed the species as Parallelodon but again without description.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF89FF86FE348043FC57FC24.taxon	description	Original source Dawson (1868): 302, text-fig. 103.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF89FF86FE348043FC57FC24.taxon	materials_examined	Type stratum and age None given, but probably from the Windsor Group (middle to upper Visean, Mississippian, Carboniferous according to Utting 1978). Type locality “ at Shubenacadie and Windsor, also in Cape Breton ”; Nova Scotia, Canada. Type material Studied material is stored at the Redpath Museum, McGill University, Montreal, under coll. no. 2818 in the coll. Dawson.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF89FF86FE348043FC57FC24.taxon	discussion	Remarks Bell (1929) placed the species in the genus Leptodesma (Pterineidae).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF89FF86FDD7828BFA97F906.taxon	description	Original source Nelzina (1961): p. 159, fig. 1 a – b.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF89FF86FDD7828BFA97F906.taxon	materials_examined	Type stratum and age “ Sakmarskiy yarus, tastubskiy gorizont ”; lower Sakmarian, Cisuralian, Permian (see Biakov 2012) Type locality “ Bashkiriya, gora Shak-Tau ” [Bashkortostan Republic, Shakhtau hill]; near Sterlitamak, Russia. Type material Figured specimen (holotype) is stored at the Academician F. N. Chernyshev Central Geological Research Museum (TsNIGR museum), St Petersburg, under coll. no. 1 / 9315 (Kadlets et al. 1996: 201).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF89FF86FDD7828BFA97F906.taxon	discussion	Remarks Nelzina (1961) used three different original spellings, “ shachtauensis ” in the heading of the description, “ schacktauensis ” in the discussion of the species and “ shacktauensis ” in the introduction and figure caption. Considering the locality name (“ Shak-Tau ” as used by Nelzina and “ Shakhtau ” as the current name), all three variants are acceptable spellings. Since the species was not found in any subsequent work, we hereby fix shachtauensis as the correct original spelling according to ICZN Art. 32.2.1.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF89FF87FDE887AAFEF8FE59.taxon	description	Original source Yanishevsky (1915): 53 [Russian], 93 [French], pl. 5 figs 6, 13, 16 – 17.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF89FF87FDE887AAFEF8FE59.taxon	materials_examined	Type stratum and age Visean, Mississippian, Carboniferous. Type locality “ la rive droite de la Tom [...] près de la ville de Tomsk ” [on the right bank of the Tom [...] near the city of Tomsk]; Tomsk Oblast, Russia. Type material Not traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF88FF87FE1F8340FE11FA94.taxon	description	Original source Chernyshev (1902): 346 [Russian], 667 [German].	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF88FF87FE1F8340FE11FA94.taxon	materials_examined	Type stratum and age Upper Carboniferous. Type locality Russia (locality unknown). Type material Not traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF88FF87FE1F8340FE11FA94.taxon	discussion	Remarks Chernyshev introduced the species as a new name for “ M. [acrodon] Lacordairianum auct. u. a. ” (non De Koninck), but it is entirely unclear to which authors he referred to. Forms previously misidentified as “ M. lacordairianum ” by Verneuil are referred to as “ M. semilarvis Keys. ” Since the respective part of the discussion deals with Upper Carboniferous faunas from the central Ural Mts, it is likely that Chernyshev referred to previously misidentified records from these deposits. Given the uncertainty of the species’ identity, material availability and the lack of further discussion in the literature, we consider this species as a nomen dubium.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF88FF80FD81841BFBFBFE25.taxon	description	Original source Tornquist (1896): 98 [632], pl. 19 fig. 8.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF88FF80FD81841BFBFBFE25.taxon	materials_examined	Type stratum and age “ [in der] schiefrigen Facies des Kohlenkalks ” (Tornquist 1895: 23) [shaly facies of the Carboniferous Limestone]; middle to upper Visean, Mississippian, Carboniferous (Amler 1987). Type locality “ Hohlweg unterhalb der Ferme [Bauernhof] Pütig ”; along the route from Bourbach-le-Haut to Masevaux, Département Haut-Rhin, France. Type material The whereabouts of the material studied by Tornquist (1896) are unknown. He stated the material as belonging to the “ Geologische Landesanstalt Elsass-Lothringen ”. Amler (1987) stated that the Tornquist collection in the Strasbourg Museum was destroyed in a fire (see also Hubmann 2014).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF88FF80FD81841BFBFBFE25.taxon	discussion	Remarks Tornquist (1896) considered specimens identified as Parallelodon obtusus (Phillips, 1836) by De Koninck (1885) as a different species and introduced Macrodon simplex. Potentially a junior synonym of Parallelodon intermedius (De Koninck, 1885) according to Amler (1987).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8FFF80FD818518FC49F963.taxon	description	Original source Phillips (1836): 209, pl. 5 fig. 22.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8FFF80FD818518FC49F963.taxon	materials_examined	Type stratum and age Top of Lower Scar Limestones; probably Great Scar Limestone, Visean, Mississippian, Carboniferous (Phillips 1836: 241; compare Amler 1987: 160). Type locality “ Bolland ”; south of Ogden Reservoir, west of Queensbury, Bradford, West Yorkshire, United Kingdom. Type material Figured specimen is a LV in matrix, stored at the Natural History Museum, London (NHMUK PI OR 97152, coll. Gilbertson).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8FFF80FD818518FC49F963.taxon	discussion	Remarks Valid as P. squamifer (Hind 1897); also listed in Hudson et al. (1966).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8FFF80FD8180F5FCDCFB90.taxon	description	Original source Chapman (1908): 38, pl. 1 fig. 3.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8FFF80FD8180F5FCDCFB90.taxon	materials_examined	Type stratum and age “ Silurian (Yeringian) [...]; in yellow sandstone ” Yan Yean Formation?, Wenlock – Ludlow, Silurian. Type locality “ Wandong, Victoria ” Wandong, County of Dalhousie, Victoria, Australia. Type material Holotype is a LV covered with sediment (coll. no. P 7950). Stored at the Museums Victoria, Melbourne.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8FFF80FD8180F5FCDCFB90.taxon	discussion	Remarks Mentioned in the type catalogue of Gill & Davies (1968). Systematic classification questionable, may rather be a taxodont protobranch (Amler & Friedel 2025).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8FFF81FDDC864EFCEDFCF1.taxon	description	Original source De Koninck (1842): 121, pl. 2 fig. 13.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8FFF81FDDC864EFCEDFCF1.taxon	materials_examined	Type stratum and age “ calcaire de Visé ”; V 3 b and V 3 c, Visean, Mississippian, Carboniferous (Demanet 1958: 29; Godefroid et al. 2006). Type locality “ Visé ”; quarries south of Visé, on the east side of the Meuse River valley (Demanet 1958; Godefroid et al. 2006), Belgium. Type material The illustrated syntypes are stored in the collection of the Géologie de l’Université Lyon. Syntype UCBL-EM 35397 (figured) is a BV specimen; three further BV specimens are available (UCBL-EM 35398 - 35400).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8FFF81FDDC864EFCEDFCF1.taxon	discussion	Remarks Junior homonym of Arca squamosa Lamarck, 1819, renamed as Arca fimbriata by De Koninck (1844: 634); see entry for that species for further details.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8EFF81FE178239FE88FAA4.taxon	description	Original source Paul (1954): 44 [6].	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8EFF81FE178239FE88FAA4.taxon	discussion	Remarks The species name only occurs (as “ G. steinhagei Paul mscr. ”) in a species list in Paul (1954), which was published after his death. Since he did not provide a description, the name is a nomen nudum. The material determined by Paul is located at the Bundesanstalt für Geowissenschaften und Rohstoffe (BGR) Berlin Spandau and derives from lower Visean (Mississippian, Carboniferous) limestones at “ Wasserfall bei Velbert (westlicher Steinbruch) ” (Velbert, Am Wasserfall, western quarry) in North Rhine-Westphalia, Germany.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8EFF81FDE0840BFCF4F810.taxon	description	Original source Herrick (1888 b): 37, pl. 6 fig. 7, pl. 11 fig. 37 [sic, actually fig. 27]; originally as “ striato-costatus ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8EFF81FDE0840BFCF4F810.taxon	materials_examined	Type stratum and age Waverly Group, Division I, upper part of Berea shale (see tabulated list compiled by Cooper appended to Herrick’s article) [Upper Devonian according to Kammer & Roeser 2012]. Type locality “ in shales seventy feet below conglomerate I, in Ashland Co. ”, Ohio, United States of America. Type material Not traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8EFF81FDE0840BFCF4F810.taxon	discussion	Remarks Not found in the literature after the original description.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8DFF82FDE78043FC79FC5D.taxon	description	Original source von Schlotheim (1820): 31, pl. 6 fig. 3 a – c.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8DFF82FDE78043FC79FC5D.taxon	materials_examined	Type stratum and age “ Höhlenkalkstein ”; Zechstein Group, Zechstein 1 (reef facies) Series, Werra Formation, Wuchiapingian, Lopingian, Permian. Type locality “ Glücksbrunn, Thuringia ”; Altenburg cave, Glücksbrunn near Bad Liebenstein-Schweina, Thuringia, Germany. Type material Lectotype is a BV specimen (MB. M. 5848.1; old no. Qu. A. 161.2) designated by Logan (1967: 41). Further specimens are stored under the coll. no. MB. M. 4858. All are stored at the Museum für Naturkunde, Berlin (coll. Schlotheim).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8DFF82FDE78043FC79FC5D.taxon	discussion	Remarks Recently revised as Parallelodon striatus by Friedel et al. (2025).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8DFF82FDE7854DFCBCF960.taxon	description	Original source De Koninck (1876): 287, pl. 16 fig. 8.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8DFF82FDE7854DFCBCF960.taxon	materials_examined	Type stratum and age Etheridge (1878, there as “ Arca ”) listed the age of this species as “ Carboniferous ”; this was repeated by Waterhouse (1958). Campbell & Bein (1971) considered the strata at the locality as probably lower Carboniferous. Type locality Burragood, on the right bank of the Paterson River, New South Wales, Australia. Type material Whereabouts unknown.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8DFF82FDE7854DFCBCF960.taxon	discussion	Remarks Etheridge (1889: 205) attributed the species to Parallelodon (as subarguta, but Parallelodon is masculine). In some cases, the first description is cited as of 1898, which is the publication date of the English translation of De Koninck’s (1876) work.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8DFF83FE6D864FFAD3FD55.taxon	description	Original source Murchison et al. (1845): 305, pl. 20 fig. 4.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8DFF83FE6D864FFAD3FD55.taxon	materials_examined	Type stratum and age “ des calcaires dévoniens ”; Devonian limestones; probably lower Famennian (cf. Lebedev et al. 2020), Devonian. Type locality “ des environs de Zadonsk, sur les bords du Don ” [from the vicinity of Zadonsk, on the banks of the Don River]; Lipetsk Oblast, Russia. Type material Not traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8DFF83FE6D864FFAD3FD55.taxon	discussion	Remarks Based on the morphology, Amler & Friedel (2025) suggested a probable affiliation with Parallelodon.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8CFF83FDD38245FD06FA22.taxon	description	Original source Gan & Yin (1978): 310, pl. 109 figs 23, 27.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8CFF83FDD38245FD06FA22.taxon	materials_examined	Type stratum and age Wujiaping Formation, Lopingian, Permian (Wang et al. 2024). Type locality Leping, Pingba, Guizhou Province, South China (Yang et al. 2015), China. Type material Holotype is a LV, no. GI- 112 (pl. 109 fig. 23); storage unknown. Fang et al. (2009) listed the storage institution for bivalve material with a similar inventory number as “ Regional Geological Survey Team of Guizhou Province ”, yet without providing details.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8CFF83FDD38245FD06FA22.taxon	discussion	Remarks Used as valid species by Yang et al. (2016).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8CFFBCFDA7848DFC79FDB5.taxon	description	Original source Krotov (1885): 245, pl. 3 fig. 12.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8CFFBCFDA7848DFC79FDB5.taxon	materials_examined	Type stratum and age “ Artinskian strata ”, Cisuralian, Permian. Type locality “ Naydena nizhe s. V. - Yaz’vy, na r. Yaz’ve ” [found below Verkhnyaya Yazva, at the Yazva River]; near the village of Antipina, Perm Krai, Russia. Type material Type material of another parallelodontid taxon described by Krotov (1885) is stored at the A. A. Shtukenberg Geological Museum of Kazan Federal University, Kazan; material of A. substriata seems to be missing though.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFF8CFFBCFDA7848DFC79FDB5.taxon	discussion	Remarks Friedel et al. (2025) placed the species in the genus Parallelodon.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB3FFBCFDD58588FACFF8C5.taxon	description	Original source d’Orbigny (1850): 165.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB3FFBCFDD58588FACFF8C5.taxon	materials_examined	Type stratum and age “ untere Zechsteine ”; Zechstein Group, Zechstein 1 (reef facies) Series, Werra Formation, Wuchiapingian, Permian (Geinitz 1848). Type locality “ Corbusen bei Ronneburg, Pössneck, Glücksbrunn, Wartburg bei Seebach in Thüringen ” [Korbussen near Ronneburg, Pössneck, Glücksbrunn, Wartburg hill near Seebach, Thuringia] (Geinitz 1848), Germany. Type material Whereabouts unknown.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB3FFBCFDD58588FACFF8C5.taxon	discussion	Remarks D’Orbigny introduced A. subtumida for a specimen that Geinitz had determined as A. tumida (1848: 9, pl. 4 fig. 7). Considered a junior synonym of P. striatus (von Schlotheim, 1820) by Friedel et al. (2025).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB3FFBCFDD28365FB68FB21.taxon	description	Original source Wanner (1922): 72, pl. 154 fig. 4 a – b.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB3FFBCFDD28365FB68FB21.taxon	materials_examined	Type stratum and age Permian beds at Soefa, Timor (Waterhouse 1987: 214). Type locality “ Soefa bei Baung, Amarassi ”; East Nusa Tenggara, Kupang, West Timor, Indonesia. Type material The figured specimen (BIOB-PAL-Wanner- 42) and additional material (BIOB-PAL-Wanner- 65) are stored at the Bonner Institute of Organismic Biology, University of Bonn.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB3FFBCFDD28365FB68FB21.taxon	discussion	Remarks Misspelt as P. subliratus by Reed (1944: 289). Mentioned by Charlton et al. (2002: 760).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB2FFBDFDDE8043FACCFC27.taxon	description	Original source Sedgwick (1829): 119.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB2FFBDFDDE8043FACCFC27.taxon	materials_examined	Type stratum and age “ Magnesian Limestone ”; Ford or Raisby Formation, Zechstein, Changhsingian, Lopingian, Permian. Type locality “ Humbleton ”; County Tyne and Wear (formerly Durham), United Kingdom. Type material Lectotype designated by Friedel et al. (2025) is a steinkern of a LV and RV (NHMUK PI PL 98, coll. Sowerby), stored at the Natural History Museum, London. Lectotype is figured by King (1850: pl. 15 fig. 8) and Friedel et al. (2025: fig. 3 a).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB2FFBDFDDE8043FACCFC27.taxon	discussion	Remarks Considered a junior synonym of Parallelodon striatus (von Schlotheim, 1820) by Friedel et al. (2025).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB2FFBDFD9C828BFACFF9C9.taxon	description	Original source Weller (1906): 450, pl. 2 figs 6 – 9.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB2FFBDFD9C828BFACFF9C9.taxon	materials_examined	Type stratum and age “ Glen Park Limestone ”; Glen Park Formation, Kinderhookian, Mississippian, Carboniferous. Type locality “ Goetz’s lime quarry, just below Glen Park station on the St. Louis, Iron Mountain and Southern Railroad, about twenty-five miles south of St. Louis, in Jefferson County, Missouri ”, United States of America. Type material Williams (1931) indicated the syntypes (“ cotypes ”) to be stored at the Field Museum of Natural History, Chicago (FMNH UC 11335).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB2FFBDFD9C828BFACFF9C9.taxon	discussion	Remarks First listed as Parallelodon by Moore (1928); further described and discussed by Williams (1931, 1943).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB2FFBEFDFA87D0FC95FDE9.taxon	description	Original source Hamlet (1928): 82, pl. 12 fig. 18; originally as sundaïcum.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB2FFBEFDFA87D0FC95FDE9.taxon	materials_examined	Type stratum and age “ Perm ” (lower Permian Soefa beds according to Waterhouse 1980). Type locality “ Töo ”; East Nusa Tenggara, West Timor, Indonesia. Type material Whereabouts unknown.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB2FFBEFDFA87D0FC95FDE9.taxon	discussion	Remarks Since Parallelodon is masculine, the species epithet should read sundaicus. Also listed by Waterhouse (1980) and mentioned by Charlton et al. (2002: 760).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB1FFBEFE018330FCD5FA8D.taxon	description	Original source Nakazawa (1999): 4, fig. 4 - 1 a – b.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB1FFBEFE018330FCD5FA8D.taxon	materials_examined	Type stratum and age “ Black shale of the uppermost fossil horizon, in the Hovtinden Member (F 11) ”; Hovtinden Mb., Kapp Starostin Formation, Lopingian, Permian (Bond et al. 2018). Type locality “ Festningen, Spitsbergen ”, Norway. Type material Holotype is an external mould of a BV specimen (HP 100050). Should have been stored at the Department of Geology and Mineralogy, Faculty of Science, Kyoto University; probably stored at the Kyoto University Museum now, but missing (Friedel et al. 2025).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB1FFBEFE018330FCD5FA8D.taxon	discussion	Remarks Described as Parallelodon suzukii by Friedel et al. (2025).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB1FFBEFE43841DFDDAF8CA.taxon	description	Original source Wei & Yang (1983): 391, pl. 149 fig. 34.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB1FFBEFE43841DFDDAF8CA.taxon	materials_examined	Type stratum and age Shiqiantan Formation, “ Middle Carboniferous ” (in Zhang 2009 as “ Shihchientan Formation ”, Pennsylvanian, Carboniferous). Type locality Kelameli [also transliterated as Kelamaili], East Junggar, Xinjiang, China. Type material Illustrated specimen: XBA- 154 (no holotype indicated); stored at Xinjiang Bureau of Geology and Mineral Resources, Urumqi, China.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB0FFBFFDCD8043FBDDFCF0.taxon	description	Original source Yanishevsky (1900): 218, pl. 3 fig. 19.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB0FFBFFDCD8043FBDDFCF0.taxon	materials_examined	Type stratum and age Astafieva-Urbajtis & Ramovš (1985) indicated a Baskhirian (Pennsylvanian, Carboniferous) age, while Mychko et al. (2025), based on a wider assessment of the area, attributed strata around the type locality to the Visean (Mississippian) to Bashkirian (Pennsylvanian), Carboniferous. Type locality Shartymka River, ca 8 km SE of Polyakovka, Bashkortostan Republic, Russia. Type material Yanishevsky did not designate a holotype. The type material (KP 426 / 443), a LV and a RV, is stored at the A. A. Shtukenberg Geological Museum of Kazan Federal University, Kazan.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB0FFBFFDFF8238FD5BFA0A.taxon	description	Original source De Koninck (1885): 148, pl. 24 fig. 23.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB0FFBFFDFF8238FD5BFA0A.taxon	materials_examined	Type stratum and age “ calcaire carbonifère de Visé (étage III) ”; V 3 b and V 3 c, Visean, Mississippian, Carboniferous (Demanet 1958: 29; Godefroid et al. 2006). Type locality “ Visé ”; quarries south of Visé, on the east side of the Meuse River valley (Demanet 1958; Godefroid et al. 2006), Belgium. Type material The illustrated syntype is stored at the Royal Belgian Institute of Natural Sciences, Brussels, coll. no. RBINS a 4680 (old no. 967; coll. de Ryckholt).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB0FFB8FD808495FE0CFD43.taxon	description	Original source McCoy (1844): 72, pl. 12 fig. 10.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB0FFB8FD808495FE0CFD43.taxon	materials_examined	Type stratum and age Dinantian (Tournaisian – Visean), Mississippian, Carboniferous; probably Mullaghfin Formation (Asbian, Visean) (pers. com. I. Somerville 2024). Type locality “ Cregg, Nobber ”, County Meath (Griffith in McCoy 1862), Ireland. Type material The total number of syntypes is not recorded, three specimens are kept in the Griffith coll. at the National Museum of Ireland, Dublin. The only specimen (NMING: F 7297) figured by McCoy (1844: pl. 12 fig. 10) and Friedel & Amler (2024: fig. 6 g) was called “ the type specimen ” by Hind (1897: pl. 11 fig. 4, 4 a), which acts as designation of a lectotype. The two other specimens are paralectotypes NMING: F 5133 and NMING: F 7298.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB0FFB8FD808495FE0CFD43.taxon	discussion	Remarks Cucullaea tenuistria was renamed Arca M’Coyana by De Koninck (1851: 670), only for the risk of confusion with the Cretaceous species Arca tenuistriata Münster in Goldfuss, 1837 (p. 142, erroneously listed as Arca tenuistria Münster in the index: 305). Since no homonymy exists, the name is a junior objective synonym of C. tenuistria. Apparently, De Koninck (1885: 162) realised that as well, ignored his earlier renaming, and used Parallelodon tenuistria as the valid name. Note that the species name is a noun in apposition.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB7FFB8FE36826EFC26FA64.taxon	description	Original source Meek & Worthen (1866 a): 17.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB7FFB8FE36826EFC26FA64.taxon	materials_examined	Type stratum and age “ Coal Measures ”; Pennsylvanian, Carboniferous. Type locality Springfield, Illinois, United States of America. Type material Not traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB7FFB8FE36826EFC26FA64.taxon	discussion	Remarks As Macrodon in the heading of the description, but in the text the authors introduced the genus Parallelodon as a replacement name for Macrodon Buckman, 1845, non Schinz, 1822, and used the combination Parallelodon tenuistriatus. The species was discussed and illustrated by Hoare et al. (1979: 31, pl. 3 figs 11 – 13) and Amler (1987: 168, pl. 5 fig. 5).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB7FFB9FD99874BFB01FE7C.taxon	description	Original source De Koninck (1842): 118, pl. 3 fig. 2 a – b.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB7FFB9FD99874BFB01FE7C.taxon	materials_examined	Type stratum and age “ calcaire anthraxifére supérieur de Visé ”; V 3 b and V 3 c, Visean, Mississippian, Carboniferous (Demanet 1958: 29; Godefroid et al. 2006). Type locality “ Visé ”; quarries south of Visé, on the east side of the Meuse River valley (Demanet 1958; Godefroid et al. 2006), Belgium. Type material The illustrated LV (UCBL-EM 35419) is stored in the collection of the Géologie de l’Université Lyon.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB7FFB9FD99874BFB01FE7C.taxon	discussion	Remarks Paul (1941) placed the species in Grammatodon; not found in the literature afterwards.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB6FFB9FDDF80A3FE39FB5E.taxon	description	Original source De Koninck (1885): 158, pl. 24 figs 26 – 27.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB6FFB9FDDF80A3FE39FB5E.taxon	materials_examined	Type stratum and age “ calcaire carbonifère de Visé (étage III) ”; V 3 b and V 3 c, Visean, Mississippian, Carboniferous (Demanet 1958: 29; Godefroid et al. 2006). Type locality “ Visé ”; quarries south of Visé, on the east side of the Meuse River valley (Demanet 1958; Godefroid et al. 2006), Belgium. Type material The illustrated syntype is stored at the Royal Belgian Institute of Natural Sciences, Brussels, coll. no. RBINS a 4717 (old no. 971, coll. De Koninck).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB6FFB9FDDF80A3FE39FB5E.taxon	discussion	Remarks De Koninck (1885) used the spelling thecidiformis in the plate caption, but the species has been consistently referred to as P. theciformis (e. g., Hind 1897: 171; Amler 1987: 162; Friedel & Amler 2024: 522, 528).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB6FFB9FDC58442FD47F897.taxon	description	Original source Waterhouse (1987): 136, pl. 1 figs 12 – 17, 19.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB6FFB9FDC58442FD47F897.taxon	materials_examined	Type stratum and age “ Top Flat Formation ”, Lopingian, Permian. Type locality “ L 4580 ”; quarry along highway north of Theodore, Bowen Basin, Banana Shire, Queensland, Australia. Type material Holotype is a RV (UQF 74304; pl. 1 fig. 17). Additional material is illustrated (UQF 74302, UQF 74303, UQF 74305, UQF 74306, UQF 74307, UQF 74308). Stored at the Department of Geology and Mineralogy, University of Queensland, Brisbane.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB6FFBAFDAD861AFD88FD27.taxon	description	Original source Chao (1927): 9, pl. 1 figs 7 – 9.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB6FFBAFDAD861AFD88FD27.taxon	materials_examined	Type stratum and age “ Spirifer taiyuanensis zone, Houkou limestone, Lincheng coal field ”; Houkou limestone, Taiyuan Formation, upper Carboniferous to lower Permian (Fang et al. 2009). Type locality “ Lincheng coal field, S. Chihli ([...] Loc. 158) ”; Lincheng County, Xingtai, Hebei, China. Type material Synypes are four specimens (given by the author as “ cotypes ”), with three of them illustrated on pl. 1 figs 7 – 9 (inv. no. 1217 – 1219); all stored at the Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB5FFBAFDE7838AFBBEFAB1.taxon	description	Original source Herrick (1888 a): 74, pl. 8 fig. 8.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB5FFBAFDE7838AFBBEFAB1.taxon	materials_examined	Type stratum and age middle Waverly Group, Kinderhookian, Tournaisian, Mississippian, Carboniferous. Type locality Licking County, Ohio (no exact locality indicated in the text), United States of America. Type material Not traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB5FFBAFDE7838AFBBEFAB1.taxon	discussion	Remarks Placed in Schizodus (Trigoniida: Schizodidae) by Herrick (1888 b: 116).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB5FFBAFD898478FE50F8CA.taxon	description	Original source Reed (1944): 288, pl. 56 fig. 13.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB5FFBAFD898478FE50F8CA.taxon	materials_examined	Type stratum and age “ Lower Productus Limestone ”; corresponds to Amb Formation (Douglass 1970), Roadian – Wordian, Guadalupian, Permian (Henderson & Shen 2020). Type locality “ Northern end of hill 1 / 2 mile S. S. W. of pt. 1185, S. of Trimu Wahan (Sheet 38 P / 14 S) ”; near Musa Khel, Punjab, Pakistan. Type material Holotype, based on only one specimen (GSI Type No. 17174 / K 30.876), is stored at the Geological Survey of India, Kolkata.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB4FFBBFDC182AFFEEDF925.taxon	description	Original source Sowerby (1824): 116, pl. 474 fig. 3.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB4FFBBFDC182AFFEEDF925.taxon	materials_examined	Type stratum and age “ Magnesian Limestone ”; Ford or Raisby Formation, Zechstein, Changhsingian, Lopingian, Permian. Type locality “ Tunstall Hill, near Sunderland ”, Durham, United Kingdom. Type material Sowerby referred to “ plentiful ” material. The only available syntype (now lectotype by subsequent designation by Friedel et al. 2025) (NHMUK PI PL 805) is a BV steinkern. Stored in the Sowerby collections of the Natural History Museum, London.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB4FFBBFDC182AFFEEDF925.taxon	discussion	Remarks Recently considered as a junior synonym of Parallelodon striatus (von Schlotheim, 1820) by Friedel et al. (2025).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB4FFBBFD838043FCF4FC01.taxon	description	Original source Walcott (1884): 243, pl. 8 fig. 2.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB4FFBBFD838043FCF4FC01.taxon	materials_examined	Type stratum and age “ Lower portion of Lower Carboniferous limestone ”; Mississippian, Carboniferous (Bailey 2021). Type locality “ East slope of a small conical hill, on the east side of Secret-cañon-roas Cañon, Eureka, District, Nevada ”, United States of America. Type material Walcott mentioned only a single specimen. The syntype (probably holotype by monotypy, coll. no. USNM PAL 14382) is stored at the Smithsonian National Museum of Natural History, Paleobiology Collection, Washington, D. C. (see also Schuchert 1905).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB4FFBBFD838043FCF4FC01.taxon	discussion	Remarks Not found in the literature after the original description.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB4FFB4FDEC87F5FE30FDCA.taxon	description	Original source De Koninck (1885): 156, pl. 25 fig. 15.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB4FFB4FDEC87F5FE30FDCA.taxon	materials_examined	Type stratum and age “ calcaire carbonifère des Pauquys (étage II) ”; Waulsort Formation, upper Tournaisian, Mississippian, Carboniferous. Type locality “ Pauquys ”; Hastière, Namur, Wallonia, Belgium. Type material The illustrated syntype is stored at the Royal Belgian Institute of Natural Sciences, Brussels, coll. no. RBINS a 4704 (old no. 653; coll. Dupont).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB4FFB4FDEC87F5FE30FDCA.taxon	discussion	Remarks Considered a Cypricardinia (Cardiniidae) by Paul (1941); placed with question mark in Parallelodon by Amler (1987).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFBBFFB4FE4C83D5FC37FB21.taxon	description	Original source Muromtseva & Guskov (1984): 37, pl. 36 fig. 7.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFBBFFB4FE4C83D5FC37FB21.taxon	materials_examined	Type stratum and age Kungurian, lower Permian. Type locality “ Zapadnyy Ural, reki Sylva i Kishert’ ” [western Urals, Sylva and Kishert rivers]; Perm Krai, Russia. Type material The holotype (coll. no. 64 / 11570) is a LV stored at the Academician F. N. Chernyshev Central Geological Research Museum (TsNIGR museum), St Petersburg, Russia.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFBBFFB4FD838588FCF4F8B0.taxon	description	Original source Rakusz (1932): 174, text-fig. 25, pl. 9 fig. 12; originally as “ vadászi ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFBBFFB4FD838588FCF4F8B0.taxon	materials_examined	Type stratum and age “ Oberkarbon ”; Pennsylvanian, Carboniferous (probably Moscovian; see Gulyás-Kis 2004). Type locality “ Eisenbahneinschnitt von Nagyvisnyó ” [Railway cut at Nagyvisnyó]; Heves County, Hungary. Type material Not traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFBBFFB4FD838588FCF4F8B0.taxon	discussion	Remarks Not found in the literature after the original description.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFBBFFB5FDF3867FFD86FD55.taxon	description	Original source Steininger (1853): 49, pl. 2 fig. 7 a – b.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFBBFFB5FDF3867FFD86FD55.taxon	materials_examined	Type stratum and age Givetian, Middle Devonian (Amler & Friedel 2025). Type locality Büdesheim (Eifel), Rhineland-Palatinate, Germany. Type material Not traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFBBFFB5FDF3867FFD86FD55.taxon	discussion	Remarks Beushausen (1895: 39, pl. 4 figs 3 – 4) synonymised Pterinea brilonensis Kayser, 1872 with Pholadomya venusta Steininger, 1853 and placed the species in Macrodus. Holzapfel (1895: 221) and Amler & Friedel (2025) placed it in Parallelodon.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFBAFFB5FDF38244FE58F9F2.taxon	description	Original source De Koninck (1842): 120, pl. 2 fig. 12 a – d; originally as “ Verneuilliana ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFBAFFB5FDF38244FE58F9F2.taxon	materials_examined	Type stratum and age “ calcaire de Visé ”; V 3 b and V 3 c, Visean, Mississippian, Carboniferous (Demanet 1958: 29; Godefroid et al. 2006). Type locality “ Visé ”; quarries south of Visé, on the east side of the Meuse River valley (Demanet 1958; Godefroid et al. 2006), Belgium. Type material The syntypes are stored in the collection of the Géologie de l’Université Lyon. None of the specimens match the figure perfectly, only the BV syntype UCBL-EM 35391 seems to be the illustrated one (fig. 12 c). Additional, but not figured, material (UCBL-EM 35392 to 35396) is available. We also found a specimen labelled as syntype (A 83703) in the Muséum national d’Histoire naturelle, Paris (JCF pers. obs.), but its status as such is unclear.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFBAFFB5FDF38244FE58F9F2.taxon	discussion	Remarks Placed in Parallelodon by De Koninck (1885) and Hind (1897). Misspelt as “ verneuilianus ” in all subsequent publications.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFBAFFB6FDEA873DFDD8FDCF.taxon	description	Original source Beushausen (1895): 38, pl. 4 fig. 2.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFBAFFB6FDEA873DFDD8FDCF.taxon	materials_examined	Type stratum and age “ Stringocephalenkalk ”; upper Givetian, Middle Devonian. Type locality “ Villmar ”; Villmar near Limburg on the Lahn, Hesse, Germany. Type material The type material, consisting of only one BV specimen (coll. no. MWNH-DEVO- 000232) is stored at the Museum Wiesbaden, Hessisches Landesmuseum für Kunst und Natur. Beushausen selected the type material for M. villmarensis from the syntypes of Arca inermis G. Sandberger & F. Sandberger, 1854. The type material of both species is stored under the same number.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFBAFFB6FDEA873DFDD8FDCF.taxon	discussion	Remarks Beushausen (1895) separated the short variety of Arca inermis G. Sandberger & F. Sandberger, 1854 [= Parallelodon michelini (d’Archiac & de Verneuil, 1842)] as a new species, Macrodus villmarensis; see also discussion of Arca inermis.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB9FFB6FDF985ABFCF4F8CD.taxon	description	Original source Stuckenberg (1905): 82 [Russian], 135 [German], pl. 10 fig. 19.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB9FFB6FDF985ABFCF4F8CD.taxon	materials_examined	Type stratum and age “ korallovyy gorizont’ ” [coral horizon]; age not specified in Stuckenberg (1905), but crinoid material from the same deposits was considered Gzhelian (uppermost Carboniferous) in age by Mirantsev & Rozhnov (2011). Type locality “ Samarskaya Luka, Tsarev Kurgan’ ”; Samara Oblast, Russia. Type material Not traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB9FFB6FDF985ABFCF4F8CD.taxon	discussion	Remarks Not found in the literature after the original description.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB9FFB6FD9683D3FEF8FB04.taxon	description	Original source Elias (1957 b): 753, pl. 91 figs 5 – 12.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB9FFB6FD9683D3FEF8FB04.taxon	materials_examined	Type stratum and age Redoak Hollow Formation, Upper Mississippian, Carboniferous. Type locality Locality not stated in the original publication. Tomlinson in Elias (1957 a) listed in the foreword four localities in the vicinity of the village of Milo (Carter County, Oklahoma), but it is unclear from which of those the material is derived. Type material Not traced.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB8FFB7FD8A821BFD62F9B9.taxon	description	Original source Gemmellaro (1892): 7.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB8FFB7FD8A821BFD62F9B9.taxon	materials_examined	Type stratum and age “ Calcare grossolano con Fusulina ”; Wordian to upper Permian (Sanfilippo et al. 2017). Type locality “ Pietra di Salomone ”; 3 km S of Palazzo Adriano, Palermo, Italy. Type material Gemmellaro did not designate types. His description is based on two syntypes, but only the steinkern of a RV illustrated in Gemmellaro (1896) is stored at the Museo Geologico Università Palermo, Italy (MGUP- 001.265).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB8FFB7FD8A821BFD62F9B9.taxon	discussion	Remarks Only briefly described in Gemmellaro (1892: 7); extended description and illustration in Gemmellaro (1896: 23 [misprinted as “ 197 ”], pl. 21 fig. 7).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB8FFB7FE348043FB9EFC94.taxon	description	Original source De Koninck (1885): 161, pl. 25 figs 13, 27 – 28, 43; originally as “ Walciodorensis ”.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB8FFB7FE348043FB9EFC94.taxon	materials_examined	Type stratum and age “ calcaire de Waulsort et des Pauquys (étage II) ”; Waulsort Formation, upper Tournaisian, Carboniferous. Type locality “ Pauquys ”; Hastière, Namur, Wallonia, Belgium. Type material The illustrated syntypes are stored at the Royal Belgian Institute of Natural Sciences, Brussels, coll. no. RBINS a 4727 (old no. 778; pl. 25 fig. 13; coll. Dupont), RBINS a 4728 (old no. 707; pl. 25 figs 27 – 28; coll. Dupont) and RBINS a 4729 (old no. 708; pl. 25 fig. 43; coll. Dupont).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB8FFB0FE468760FCC2FEC9.taxon	description	Original source Wei & Yang (1983): 391, pl. 149 fig. 13 a – b.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFB8FFB0FE468760FCC2FEC9.taxon	materials_examined	Type stratum and age Yamansu Formation, Mississippian, Carboniferous (see also Zhao et al. 2019). Type locality Hami Mt Pass, Xinjiang, China. Type material Yang did not designate a holotype. The illustrated specimen (XBA- 132) is s a BV and stored at Xinjiang Bureau of Geology and Mineral Resources, Urumqi, China.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFBFFFB0FDF7857BFC5AF97C.taxon	description	Original source von Schauroth (1853): 192 [48], fig. 17 a – b.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFBFFFB0FDF7857BFC5AF97C.taxon	materials_examined	Type stratum and age “ Dolomite von Pösneck ”; Zechstein Group, Zechstein 1 (reef facies) Series, Werra Formation, Wuchiapingian, Lopingian, Permian. Type locality “ Pösneck ” [Pössneck]; Thuringia, Germany. Type material Species based on only one BV specimen (NMC-F- 1185), which is stored at the Naturkundemuseum Coburg.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFBFFFB0FDF7857BFC5AF97C.taxon	discussion	Remarks Recently revised as Parallelodon zerrenneri by Friedel et al. (2025).	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFBFFFB0FDEE80D0FCF4FBB4.taxon	description	Original source Wang (1982): 460, pl. 2 figs 15 – 21.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFBFFFB0FDEE80D0FCF4FBB4.taxon	materials_examined	Type stratum and age Lower section of the Miaochong Formation; Upper Carboniferous (Zhang 2009). Type locality West side of Yangshan Coal Mine, Gushi County, Henan, China. Type material The holotype (Y 0075) and paratypes (Y 0076 to Y 0082) are stored at the Henan Geological Bureau, Zhengzhou, China.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
B77687CEFFBFFFB0FDEE80D0FCF4FBB4.taxon	discussion	Remarks Not found in the literature after the original description.	en	Friedel, Julia C., Neubauer, Thomas A., Amler, Michael R. W. (2026): A nomenclator of the Palaeozoic taxa of the family Parallelodontidae (Bivalvia, Arcida). European Journal of Taxonomy 1065: 1-136, DOI: 10.5852/ejt.2026.1065.3289, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3289/14501
