taxonID	type	description	language	source
F41887F51C1DE87EFDEFF8D5FDFED165.taxon	description	Fig. 1; Table 1	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C1DE87EFDEFF8D5FDFED165.taxon	discussion	Remarks This species is characterized by a granulated dorsal integument, antennae with tubercles bearing scale-setae, and pereopod 7 without sexual dimorphism (Table 1). The male pleopod I endopod lacks a distal lobe, and the exopod is triangular with a rounded external edge and without any notch at the base of the two equal ciliated rami. The male pleopod II endopod has a distal segment 2.2 × the length of the basal segment, which is very thick with a tapered tip. This is a troglobiotic species (Table 1).	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C1DE87EFDEFF8D5FDFED165.taxon	distribution	Distribution This species is only known from a single cave in Portugal, Algar do Javali (Lisbon, Montejunto Massif) (Reboleira et al. 2015; Fig. 1).	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C1DE87DFDA2F97CFDACD16C.taxon	type_taxon	Type species Trichoniscoides sarsi Patience, 1908.	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C1EE87FFDDBF8D8FEC3D5F6.taxon	description	Figs 2 A, 3 A, 4; Table 1	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C1EE87FFDDBF8D8FEC3D5F6.taxon	materials_examined	Material examined PORTUGAL – Aveiro • 1 ♂; Gruta Maior da Fujaca, Pampilhosa do Botão; 26 Feb. 1987; Antoni Serra leg.; Antonio Cruz coll.; CRBA- 86807.	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C1EE87FFDDBF8D8FEC3D5F6.taxon	discussion	Remarks This species is characterized by a granulated dorsal integument (Fig. 2 A), antennae with tubercles bearing scale-setae, male pereopod 7 sexually dimorphic, merus with a short hook-like process that has a terminal spine in the middle of the sternal edge (Fig. 3 A; Table 1). The male pleopod I endopod has a very long distal lobe, triangular with a rounded tip, and the exopod is sub-quadrangular with a rounded external edge and with a prominent notch at the base of the two nearly equal ciliated rami, with the internal ramus slightly thinner than the external one (Table 1). The male pleopod II endopod has a distal segment 3.6 × the length of the basal segment, with the distal segment being thin and ending in a curved point with a rounded tip, surrounded by a hyaline membrane; exopod II is trapezoidal (Table 1). This is a troglobiotic species (Table 1).	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C1EE87FFDDBF8D8FEC3D5F6.taxon	distribution	Distribution This species was recorded from Gruta dos Alqueves (Coimbra) in Portugal by Vandel (1946, 1952). The present work extends the known distribution of Trichoniscoides broteroi to approximately 15 km north (Fig. 4).	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C18E879FE3AFEB6FC65D509.taxon	description	Figs 2 B – E, 3 B – F, 5; Table 1	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C18E879FE3AFEB6FC65D509.taxon	materials_examined	Type material examined Paratypes PORTUGAL – Braga • 1 ♂, Fradelos; 41.3545 ° N, 8.6063 ° W; 27 May 2022; L. P. Da Silva leg.; paratype, cited by Cifuentes & Da Silva (2023 a); JC 667 (ex. LPS 332) • 1 ♀; same data as for preceding; paratype, cited by Cifuentes & Da Silva (2023 a); JC 668 (ex. LPS 333 c). Other material examined PORTUGAL – Viana do Castelo • 2 ♂♂; Bárrio; 41.8400 ° N, 8.5845 ° W; 12 Nov. 2023; L. P. Da Silva leg.; LPS 785 a • 2 ♀♀; same data as for preceding; LPS 785 b • 1 ♀; Bárrio; 41.8401 ° N, 8.5843 ° W; 12 Nov. 2023; L. P. Da Silva leg.; LPS 784 • 4 ♂♂; same data as for preceding; LPS 787 • 1 ♂, Castanheira, 41.9025 ° N, 8.5482 ° W; 12 Nov. 2023; L. P. Da Silva leg.; LPS 789 a • 3 ♀♀, same data as for preceding; LPS 789 b.	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C18E879FE3AFEB6FC65D509.taxon	discussion	Remarks This species is characterized by a granulated dorsal integument (Fig. 2 B), antennae with tubercles bearing scale-setae, male pereopod 7 sexually dimorphic, merus with a hook-like process that has a terminal spine in the middle of the sternal edge (Figs 2 C, 3 B, Table 1). The male pleopod I endopod has a large triangular distal lobe (Fig. 3 C), and the exopod is triangular (Figs 2 D, 3 D) and without any notch at the base of the two very unequal ciliated rami, with the internal ramus nearly vestigial and the external one very long. The male pleopod II endopod (Figs 2 E, 3 E) has a distal segment 3 × the length of the basal segment, the distal segment broad for the first two-thirds and narrows abruptly to a pointed tip, and the exopod II is trapezoidal (Fig. 3 F). This is an epigean species (Table 1).	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C18E879FE3AFEB6FC65D509.taxon	distribution	Distribution This Iberian Peninsula endemic species is known from Portugal at Fradelos in Braga (Cifuentes & Da Silva 2023 a), and as ‘ Trichoniscoides species A’ from Castanheira and Vascões in Viana do Castelo (Fig. 5), and from Avión (Orense) in Spain (Gregory et al. 2012).	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C1AE874FDC3FA7CFCA9D3A3.taxon	description	Figs 6 – 8; Table 1	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C1AE874FDC3FA7CFCA9D3A3.taxon	materials_examined	Material examined PORTUGAL – Leiria • 1 ♀; A-da-Gorda; 39.3482 ° N, 9.1587 ° W; 13 Apr. 2022; L. P. Da Silva leg.; LPS 262 • 1 ♀; Alvaiázere; 39.8264 ° N, 8.4135 ° W; 15 Mar. 2022; L. P. Da Silva leg.; LPS 172. – Porto • 4 ♀♀; Macieira da Maia; 41.3416 ° N, 8.6872 ° W; 3 Jul. 2022; L. P. Da Silva leg.; LPS 430 • 1 ♀; Macieira da Maia; 41.3408 ° N, 8.6926 ° W; 3 Jul. 2022; L. P. Da Silva leg., LPS 432 b • 1 ♀; Macieira da Maia; 41.3404 ° N, 8.6924 ° W; 3 Jul. 2022; L. P. Da Silva leg.; LPS 433 • 3 ♀♀; Sabariz; 41.3492 ° N, 8.6780 ° W; 28 Jun. 2022; L. P. Da Silva leg.; LPS 410 b • 1 ♂; Sabariz; 41.3493 ° N, 8.6780 ° W; 28 Jun. 2022; L. P. Da Silva leg.; LPS 413 b • 3 ♀♀; same data as for preceding; LPS 413 c • 3 ♀♀; Sabariz; 41.3511 ° N, 8.6821 ° W; 28 Jun. 2022; L. P. Da Silva leg.; LPS 415 • 1 ♀; Sabariz; 41.3510 ° N, 8.6818 ° W; 28 Jun. 2022; L. P. Da Silva leg.; LPS 416 • 3 ♀♀; same data as for preceding; LPS 417 • 2 immatures; same data as for preceding; LPS 419 • 1 ♂; Santo Estêvão de Barrosas; 41.3427 ° N, 8.2889 ° W; 1 Oct. 2022; L. P. Da Silva leg.; JC 686 (ex. LPS 464 a) • 4 ♀♀; same data as for preceding; LPS 464 b. – Viana do Castelo • 1 ♀; Bárrio; 41.8401 ° N, 8.5846 ° W; 12 Nov. 2023; L. P. Da Silva leg.; LPS 788 • 1 ♂; Castanheira; 41.9025 ° N, 8.5483 ° W; 12 Nov. 2023; L. P. Da Silva leg.; LPS 791 • 1 ♂; same data as for preceding; LPS 793 a • 1 ♂; same data as for preceding; JC 1054 (ex. LPS 793 c) • 2 ♀♀; same data as for preceding; LPS 793 b • 1 ♀; Gondarém; 41.9214 ° N, 8.7606 ° W; 11 Jun. 2022; L. P. Da Silva leg.; LPS 364 • 3 ♀♀; same data as for preceding; LPS 366 • 1 ♀; Gondarém; 41.9213 ° N, 8.7606 ° W; 11 Jun. 2022; L. P. Da Silva leg.; JC 1052 (ex. LPS 365 a) • 3 ♀♀; same data as for preceding; LPS 365 b • 1 ♀; Trás-Âncora; 41.7962 ° N, 8.7382 ° W; 10 Jun. 2022; L. P. Da Silva leg.; LPS 345 • 6 ♀♀; Trás-Âncora; 41.7960 ° N, 8.7383 ° W; 10 Jun. 2022; L. P. Da Silva leg.; LPS 346 • 2 ♀♀; Trás-Âncora; 41.7961 ° N, 8.7384 ° W; 10 Jun. 2022; L. P. Da Silva leg.; LPS 347.	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C1AE874FDC3FA7CFCA9D3A3.taxon	discussion	Remarks This species is characterized by a smooth integument (Fig. 6 A), antennae without tubercles bearing scale-setae, and pereopod 7 without sexual dimorphism (Table 1). The male pleopod I endopod has a long and triangular lobe (Figs 6 B, 7 A), and the exopod is triangular (Figs 6 C, 7 B), with almost no notch and two nearly equal ciliated rami, with the external ramus slightly thinner and longer than the internal. The male pleopod II endopod (Figs 6 D, 7 C) has a distal segment 3.5 × the length of the basal segment, ending in a thin tip covered by a hyaline membrane, and the exopod II is trapezoidal (Figs 6 D, 7 D). This is an epigean species (Table 1).	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C1AE874FDC3FA7CFCA9D3A3.taxon	distribution	Distribution In Portugal, the species is recorded from the districts of Braga (Albergaria, Serra do Gerez), Porto (Fragas do Diabo) and Viana do Castelo (Carvoeiro, Castanheira, central Lindoso, Mantelàes, Vascões) (Vandel 1946; Gregory et al. 2012). In Spain, it is known from the provinces of A Coruña (Santiago), Cantabria (Ruente, Saja), León (Río Duerna, Posada), Orense (Avión, Beade, Beiro, Lobios) and Pontevedra (Amorín, As Eiras, Cangas, Gondomar, Marín, Oia, Puerto de Moncelos) (Schmölzer 1955, 1971; Gregory et al. 2012; Cifuentes 2019 b). It is recorded for the first time in the district of Leiria, which is the southernmost record of this species in Portugal (Fig. 8).	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C14E870FDC7F9A1FC28D704.taxon	description	Figs 9 – 11; Table 1	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C14E870FDC7F9A1FC28D704.taxon	materials_examined	Material examined PORTUGAL – Aveiro • 1 ♀; Grada; 40.2995 ° N, 8.4644 ° W; 5 Mar. 2022; L. P. Da Silva leg.; LPS 121 • 1 ♂; Mealhada; 40.3805 ° N, 8.4573 ° W; 20 Feb. 2022; L. P. Da Silva leg.; LPS 102. – Coimbra • 1 ♂; Algar da Dona Justa; 40.0361 ° N, 8.5077 ° W; 29 Dec. 2023; L. P. Da Silva leg.; LPS 871 a • 4 ♀♀; same data as for preceding; LPS 871 b • 1 ♂; same data as for preceding; LPS 871 c • 1 ♀; Gruta d’el Rey, Portunhos; 40.2943 ° N, 8.5470 ° W; 21 Jul. 2024; L. P. Da Silva leg.; LPS 932 • 1 ♂; same data as for preceding; LPS 933 • 1 ♂; same data as for preceding; LPS 934 • 2 ♀♀; Porto de Carros; 40.3321 ° N, 8.5116 ° W; 21 May 2022; L. P. Da Silva leg.; LPS 315 • 1 ♂; Porto de Carros; 40.3320 ° N, 8.5116 ° W; 21 May 2022; L. P. Da Silva leg.; JC 654 (ex. LPS 317) • 2 ♂♂, Serra da Boa Viagem; 40.1960 ° N, 8.9043; 26 Dec. 2022; L. P. Da Silva leg.; JC 1055 (ex. LPS 633 a) • 1 ♀; same data as for preceding; LPS 633 b • 5 ♂♂, same data as for preceding; LPS 633 c • 1 ♂; Vale Soeiro; 40.3130 ° N, 8.4023 ° W; 23 Dec. 2022; L. P. Da Silva leg.; LPS 621. – Leiria • 1 ♀; A-da-Gorda; 39.3483 ° N, 9.1587 ° W; 31 Dec. 2022; L. P. Da Silva leg.; LPS 728 • 1 ♂; A-da-Gorda, 39.3482 ° N, 9.1586 ° W; 31 Dec. 2022; L. P. Da Silva leg.; LPS 729 a • 1 ♀; same data as for preceding; LPS 729 b • 1 ♂; A-da-Gorda; 39.3482 ° N, 9.1588 ° W; 31 Dec. 2022; L. P. Da Silva leg.; LPS 730 a • 1 ♀; same data as for preceding; LPS 730 b • 1 ♀; A-da-Gorda; 39.3483 ° N, 9.1588 ° W; 31 Dec. 2022; L. P. Da Silva leg.; LPS 731 • 1 ♂; A-da-Gorda; 39.3483 ° N, 9.1587 ° W; 31 Dec. 2022; L. P. Da Silva leg.; LPS 732 • 1 ♀; A-da-Gorda; 39.3485 ° N, 9.1587 ° W; 31 Dec. 2022; L. P. Da Silva leg.; LPS 733 • 1 ♂; Alvaiázere; 39.8263 ° N, 8.4133 ° W; 9 Nov. 2023; L. P. Da Silva leg.; LPS 781 a • 1 ♀; same data as for preceding; JC 1057 (ex. LPS 781 b) • 2 ♀♀; same data as for preceding; LPS 781 c.	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C14E870FDC7F9A1FC28D704.taxon	discussion	Remarks This species is characterized by a smooth integument (Fig. 9 A), antennae with tubercles bearing scale-setae, and pereopod 7 without sexual dimorphism (Table 1). The male pleopod I endopod (Figs 9 B, 10 A) lacks a distal lobe, with the posterior edge truncated or gently curved, and the exopod I is triangular (Figs 9 B, 10 B), with a rounded external edge and a pronounced notch at the base of the two subequal ciliated rami, with the internal ramus slightly shorter and equally or slightly thinner. The male pleopod II endopod (Figs 9 C, 10 C) has a distal segment that is 4 × the length of the basal segment and narrows to a very thin tip covered by a hyaline membrane, and the exopod II is trapezoidal, with a pronounced posterior internal tip (Figs 9 D, 10 D). Epigean species, but facultative in some caves (troglophilic). Vandel (1946) noted that individuals preserved in alcohol were completely white and lacked an ocular apparatus. However, the specimens we collected are orange to reddish, except for some found inside caves, which are predominantly white, with a reddish ocellus. They lose their pigmentation when preserved in alcohol.	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C14E870FDC7F9A1FC28D704.taxon	distribution	Distribution The species is only known in Portugal and has been recorded from the districts of Algarve (Algarve Massif, Gruta da Senhora; Lagos, Gruta do Algar), Aveiro (Pampilhosa do Botão), Braga (Terras de Bouro), Coimbra (Cantanhede, Portuhos, Gruta d’el Rey), Leiria (Alvaiázere, Algar de Serra; Pôrto de Mós; Sicó Massif, Gruta Abrigo Tomar I; Soutocico, Algar de Rocha) and Lisboa (Cadaval, Algarve da Terra da Bôlha, Algarve nº 1 da Senhora das Neves, Senhora das Neves, Montejunto; Buracos Mineiros; Cruz Quebrada) by Vandel (1946) and Reboleira et al. (2015; Fig. 11).	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C10E871FDF7FE3AFAA9D7F9.taxon	description	Fig. 12; Table 1	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C10E871FDF7FE3AFAA9D7F9.taxon	discussion	Remarks This species is characterized by an integument with very weak granulations, antennae with tubercles bearing scale-setae, and pereopod 7 without sexual dimorphism (Table 1). The male pleopod I endopod lacks a distal lobe, and the exopod is rectangular, without a notch at the base of the two unequal ciliated rami (internal one thicker). The male pleopod II endopod has a distal segment 3.6 × the length of the basal segment, and it ends in a long, slender tip. This is a troglobiotic species (Table 1).	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C10E871FDF7FE3AFAA9D7F9.taxon	distribution	Distribution This Portugese endemic species has been recorded from the districts of Leiria (Pôrto de Mós, Algar do Burro, Algar do Ladoeiro, Algar do Vale da Pena, Algar do Zé de Braga, Gruta do Almonda, Gruta do Papagaio, Gruta dos Moinhos Velhos, Lapa dos Ladoeiros, Lapa de Chá de Cima) and Santarém (Minde, Lapa da Ovelha and Gruta das Alcobertas) by Vandel (1946, 1952) and Reboleira et al. (2015; Fig. 12).	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C11E872FDCDFE46FDF1D7BF.taxon	description	Fig. 13; Table 1	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C11E872FDCDFE46FDF1D7BF.taxon	discussion	Remarks This species is characterized by an integument with weak granulations, antennae with tubercles bearing scale-setae, and pereopod 7 without sexual dimorphism (Table 1). The male pleopod I endopod lacks a distal lobe, and the exopod is triangular with a notch at the base of the two equal ciliated rami. The male pleopod II endopod has a distal segment 3 × the length of the basal segment, ending in a long, slender and slightly curved tip, the exopod II is trapezoidal. This is a troglobiotic species (Table 1).	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C11E872FDCDFE46FDF1D7BF.taxon	distribution	Distribution This Portugal endemic species is only known from its type locality, Lapa Salgada in Fátima, Santarém district (Vandel, 1946; Fig. 13).	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C12E873FDA2FD84FCD3D34B.taxon	description	Figs 14 – 16; Table 1	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C12E873FDA2FD84FCD3D34B.taxon	materials_examined	Type material examined Holotype PORTUGAL – Bragança • ♂; Miranda do Douro, Grutas de Santo Adrião; 24 Feb. 1987; Antoni Serra leg.; Antonio Cruz col.; CRBA- 86825. Allotype PORTUGAL – Bragança • ♀; same data as for holotype; Antonio Cruz col.; CRBA- 86824. Paratypes PORTUGAL – Bragança • 6 ♀♀, same data as for holotype; Antonio Cruz col.; CRBA- 86826 • 2 ♂♂; same data as for holotype; Antonio Cruz col.; CRBA- 86827. Other material examined PORTUGAL – Bragança • 1 ♀; Miranda do Douro, Grutas de Santo Adrião; 41.5298 ° N, 6.4734 ° W; 29 Feb. 2024; L. P. Da Silva leg.; LPS 879.	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C12E873FDA2FD84FCD3D34B.taxon	discussion	Remarks This species is characterized by a granulated dorsal integument (Fig. 14 A), antennae with tubercles bearing scale-setae, and pereopod 7 without sexual dimorphism (Table 1). The male pleopod I endopod (Figs 14 B – C, 15 A) has a short, wide and rounded distal lobe with a sinuous edge, and the exopod is triangular (Figs 14 C, 15 B), with a notch at the base of the two unequal ciliated rami, with the internal ramus thinner than the external. The male pleopod II endopod (Figs 14 D, 15 C) has a distal segment 1.8 × the length of the basal segment, ending in a long, slender tip with a chitinous shaft accompanied by a hyaline membrane, and the exopod II is trapezoidal (Figs 14 D, 15 D). This is a troglobiotic species (Table 1).	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C12E873FDA2FD84FCD3D34B.taxon	distribution	Distribution This Iberian Peninsula endemic species is known from two caves: Gruta de Santo Adrião in Miranda do Douro (Bragança, Portugal) (Cruz 1993; Fig. 16) and Cueva de Valporquero in Vegacervera (León, Spain; Cifuentes, 2019 a), which are 166 km apart.	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C0CE86DFE1FFA6BFC8CD424.taxon	description	Figs 17 – 19; Table 1	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C0CE86DFE1FFA6BFC8CD424.taxon	materials_examined	Material examined PORTUGAL – Leiria • 1 ♂; Algar da Lagoa; 39.9279 ° N, 8.5247 ° W; 29 Dec. 2023; L. P. Da Silva leg.; LPS 868 • 1 ♂; same data as for preceding; LPS 869 a • 1 ♂; same data as for preceding; JC 1124 (ex. LPS 870 a).	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C0CE86DFE1FFA6BFC8CD424.taxon	discussion	Remarks This species is characterized by a smooth integument (Fig. 17 A), antennae with tubercles bearing scale-setae, and male pereopod 7 with sexual dimorphism (Table 1), merus bears a short process with a terminal spine in the middle of the sternal edge (Figs 17 B, 18 A). The male pleopod I endopod (Figs 17 C, 18 B) has a short triangular distal lobe, and the exopod (Figs 17 D, 18 C) is quadrangular with a rounded outer edge and lacks a notch at the base of the two unequal ciliated rami, with the internal ramus shorter and thinner than the external. The male pleopod II endopod (Figs 17 E – F, 18 D) has a distal segment 1.5 × the length of the basal segment, terminating in a bifurcated and complex tip with two terminal spines, and the exopod (Fig. 18 E) is trapezoidal, with a broadly rounded posterior internal tip. This is a troglobiotic species (Table 1).	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C0CE86DFE1FFA6BFC8CD424.taxon	distribution	Distribution This Portugal endemic is known from the caves Gruta da Arrifana, Gruta da Senhora da Estrela, Gruta de São Simão, Gruta do Algarinho, Gruta do Soprador do Carvalho and Gruta da Cerâmica in Sicó Massif, and the district of Leiria (Reboleira et al. 2015; Fig. 19).	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C0FE868FDFAFEB6FCD5D733.taxon	description	Fig. 20; Table 1	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C0FE868FDFAFEB6FCD5D733.taxon	discussion	Remarks This species is characterized by a smooth integument, antennae with tubercles bearing scale-setae, and the male pereopod 7 sexually dimorphic, with a short and thick merus, carpus and propodus (Table 1). The male pleopod I endopod has a very long and triangular distal lobe with a rounded tip, and the exopod is triangular with rounded sides and a strong notch at the base of the two unequal rami stalks, with the internal one much smaller than the external. The male pleopod II endopod has a distal segment 3.6 × the length of the basal segment, with a very thin, long and sharp tip. This is a troglobiotic species (Table 1).	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C0FE868FDFAFEB6FCD5D733.taxon	distribution	Distribution This Portugese endemic is only known from its type locality, Gruta Alta do Cabeco dos Mosqueiros, in Aljubarrota, Leiria district (Vandel 1946; Fig. 20).	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C08E86BFDC5FE12FD31D502.taxon	description	urn: lsid: zoobank. org: act: E 34 DAC 4 B- 4165 - 445 B-B 5 E 8 - F 494935 FB 8 A 0 Figs 21 – 24; Table 1	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C08E86BFDC5FE12FD31D502.taxon	diagnosis	Diagnosis Coloration orange. Ocular apparatus with large black ocellus. Granular integument. Antenna with tubercles bearing scale-setae and three-segmented flagellum. In males, pereopods 1 and 2 with hyaline scales on merus and carpus, pereopod 3 with scales only on merus, pereopod 7 with hook-like process on merus. Male pleopod I endopod with triangular distal lobe; exopod trapezoidal with two unequal ciliated rami (internal smaller). Male pleopod II endopod broad, with hyaline membrane, ending in short, wide, triangular tip; exopod rectangular.	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C08E86BFDC5FE12FD31D502.taxon	etymology	Etymology The specific name refers to Castanheira, the locality where the specimens that prompted the description of the new species were found.	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C08E86BFDC5FE12FD31D502.taxon	materials_examined	Type material Holotype PORTUGAL – Viana do Castelo • ♂; Castanheira; 41.9136 ° N, 8.5620 ° W; 12 Nov. 2023; L. P. Da Silva leg.; MNCN 20.04 / 21006 (ex. LPS 792 a). Paratypes PORTUGAL – Viana do Castelo • 1 ♀; same data as for holotype; MNCN 20.04 / 21007 (ex. LPS 792 b) • 1 ♀; same data as for holotype; LPS 792 c • 1 ♂, same data as for holotype; JC 1048 (ex. LPS 794).	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C08E86BFDC5FE12FD31D502.taxon	description	Description MEASUREMENTS. Maximum observed length: female 3 mm, male 2 mm. COLORATION. Orange, with marked muscle insertions and one large black ocellus (Fig. 21 A). INTEGUMENTARY CHARACTERS. Integument with granulation (Fig. 21 A), five rows on cephalon, four on pereonite I, three on pereonite II, two on pereonite III to VII. Additional row along posterior margin of each pereonite. In pleon, one row along posterior margin of first three pleonites. APPENDAGES. Antennules with three segments, second slightly shorter, third rectangular, very narrow, with three long terminal aesthetascs and lateral spine (Fig. 22 A). Antennae very short (Fig. 21 A), barely extending beyond posterior margin of pereonite I, with tubercles bearing scale-setae on fourth and fifth segments. Flagellum with three subequal segments, second with group of long aesthetascs. Buccal parts (Fig. 22 B – F) as in congeners: left mandible with three free penicils (Fig. 22 B), right mandible with two free penicils (Fig. 22 C; rotated to show lacinia mobilis in its position); inner endite of maxillula with three free penicils (Fig. 22 D). MALE SEXUAL CHARACTERS. Pereopod 1 (Fig. 23 B) and 2 with triangular hyaline scales on merus and carpus; carpus I tip with group of fan-shaped setae. Pereopod 3 merus has two groups of setae. Pereopod 7 merus with strong, curved hook-like process (Figs 21 B, 23 B), inserted at sternal edge and ending in small seta. Pleopod I endopod triangular (Figs 21 C, 23 C) with thick ciliated ramus inserted laterally, forming triangular distal lobe with rounded tip; ramus same length article it is inserted into, ending in lanceolate tip. Exopod I trapezoidal (Figs 21 D, 23 D) with rounded outer margin and two unequal long ciliated rami, outer thicker than inner one, no notch at base of ciliated rami. Pleopod II endopod straight (Figs 21 E, 23 E), very broad, surrounded by large hyaline membrane, with distal segment as long as basal one, ending in short, wide, claw-like apically rounded tip. Exopod II rectangular (Fig. 23 F), much wider than long, lacking internal tip, having small ciliated stem and spine, with fan-shaped setae on internal and external margins.	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C08E86BFDC5FE12FD31D502.taxon	biology_ecology	Ecology Trichoniscoides castanheirensis sp. nov. is an epigean species (Table 1) found among large accumulation of wet leaf litter of deciduous trees, predominantly Quercus orocantabrica Rivas Mart., Penas, T. E. Díaz & Llamas.	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C08E86BFDC5FE12FD31D502.taxon	discussion	Remarks Specimens matching this species, based on pereopod 7 and pleopods I and II, were previously found at Castanheira by Gregory et al. (2012). However, they were not formally described or named and were simply referred to as Trichoniscoides species C.	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C04E867FDD2FEB6FD79D49F.taxon	description	urn: lsid: zoobank. org: act: B 5 E 7 F 5 EA- 6889 - 4711 - 8 FC 3 - F 85 D 295 C 8 AFD Figs 25 – 27; Table 1	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C04E867FDD2FEB6FD79D49F.taxon	diagnosis	Diagnosis Coloration orange to dark red. Ocular apparatus with large ocellus, from orange to black. Granular integument. Antenna with tubercles bearing scale-setae and three-segmented flagellum. In males, pereopods 1 and 2 with hyaline scales on merus and carpus, pereopod 7 with conical process on merus. Male pleopod I endopod with long, triangular distal lobe, exopod trapezoidal with two unequal ciliated rami (internal shorter and much thinner). Male pleopod II endopod broad, with hyaline membrane, exopod trapezoidal.	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C04E867FDD2FEB6FD79D49F.taxon	etymology	Etymology The specific name refers to Monte Cordova, whose waters feed the Leça River and Quedas da Fervença, where the riparian gallery inhabited by this species is located.	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C04E867FDD2FEB6FD79D49F.taxon	materials_examined	Type material Holotype PORTUGAL – Porto • ♂; Quedas da Fervença, Valinhas; 41.3010 ° N, 8.4495 ° W; 1 Nov. 2022; L. P. Da Silva leg.; MNCN 20.04 / 21008 (ex. LPS 490). Paratypes PORTUGAL – Porto • 1 ♀; Quedas da Fervença, Valinhas; 41.3008 ° N, 8.4494 ° W; 1 Nov. 2022; L. P. Da Silva leg.; LPS 491 • 1 ♀; Quedas da Fervença, Valinhas; 41.3011 ° N, 8.4490 ° W; 1 Nov. 2022; L. P. Da Silva leg.; LPS 492 • 1 ♂; Quedas da Fervença, Valinhas; 41.3010 ° N, 8.4487 ° W; 1 Nov. 2022; L. P. Da Silva leg.; LPS 493 • 1 ♀; Quedas da Fervença, Valinhas; 41.3012 ° N, 8.4489 ° W; 4 Mar. 2023; L. P. Da Silva leg.; LPS 744 • 2 ♀♀; Quedas da Fervença-Valinhas; 41.3011 ° N, 8.4489 ° W; 4 Mar. 2023; L. P. Da Silva leg.; LPS 745 • 1 ♂; Quedas da Fervença, Valinhas; 41.3010 ° N, 8.4495 ° W; 22 Oct. 2023; L. P. Da Silva leg.; JC 1049 (ex. LPS 776 a) • 4 ♀♀; same data as for preceding; LPS 776 b • 1 ♀; same data as for preceding; MNCN 20.04 / 21009 (ex. LPS 776 c) • 1 ♀; same data as for preceding; JC 1050 (ex. LPS 776 d) • 4 ♀♀; Quedas da Fervença, Valinhas; 41.3011 ° N, 8.4486 ° W; 22 Oct. 2023; L. P. Da Silva leg.; LPS 777 • 1 ♂; Quedas da Fervença, Valinhas; 41.3015 ° N, 8.4488 ° W; 22 Oct. 2023; L. P. Da Silva leg.; LPS 778.	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C04E867FDD2FEB6FD79D49F.taxon	description	Description MEASUREMENTS. Maximum observed length: female 2.8 mm, male 2.1 mm. COLORATION. Males light orange with large orange ocellus. Females dark red with large black ocellus (Fig. 25 A). INTEGUMENTARY CHARACTERS. Integument with granulation (Fig. 25 A), four rows on cephalon, four on pereonite I, three on remaining pereonites, with one row on posterior margin. In pleon, one row of marked granulations on posterior margin of first three pleonites, rest very fine. Granulations fade toward posterior region. APPENDAGES. Antennules with three segments, second shortest, third with three long aesthetascs (Fig. 26 A). Antennae short (Figs 25 A, 26 B), barely extending beyond posterior margin of pereonite I, with tubercles bearing scale-setae on fourth and fifth segments. Flagellum with three subequal segments, second with group of long aesthetascs. Buccal parts as in other species. MALE SEXUAL CHARACTERS. Pereopod 1 (Fig. 26 C) and 2 with triangular hyaline scales on merus and carpus; carpus I tip with group of fan-shaped setae. Pereopod 7 merus with strong and straight process (Figs 25 B, 26 D), inserted in anterior half, bearing small seta. Pleopod I endopod with ciliated ramus inserted laterally, forming large triangular distal lobe (Figs 25 C, 26 E). Exopod I trapezoidal (Figs 25 D, 26 F) with rounded outer margin and two unequal long ciliated rami, outer much thicker than inner. Pleopod II endopod straight (Figs 25 E, 26 G), very broad, with distal segment twice the length of basal segment, surrounded by large hyaline membrane, ending in sharp tip reinforced with chitinous shaft. Exopod II trapezoidal (Fig. 26 H), lacking internal tip, with two small ciliated stems and fan-shaped setae on internal and external edges.	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C04E867FDD2FEB6FD79D49F.taxon	biology_ecology	Ecology Trichoniscoides cordovensis sp. nov. is an epigean species (Table 1) found among wet leaf litter in a relatively well-preserved riparian gallery. All specimens were found in the litter accumulated at the base of relatively large Quercus suber L. trees.	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C07E863FDB8FCA6FE83D5A3.taxon	description	urn: lsid: zoobank. org: act: 3131 C 46 F- 1 E 1 C- 4 E 1 F- 9 A 2 B-D 28 D 47 EAB 7 C 3 Figs 28 – 30; Table 1	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C07E863FDB8FCA6FE83D5A3.taxon	diagnosis	Diagnosis Coloration orange. Ocular apparatus with large black ocellus. Granular integument. Antenna with tubercles bearing scale-setae and three-segmented flagellum. In males, pereopods 1 and 2 with hyaline scales on merus and carpus, pereopod 7 with short blunt process on merus. Male pleopod I endopod with small, rounded distal lobe; exopod triangular with long posterior-internal extension at posterior-internal edge and two subequal ciliated rami (internal slightly shorter and thinner). Male pleopod II endopod broad with hyaline membrane; exopod trapezoidal, with sinuous posterior edge and short, broad posterior-internal tip, rounded with large ciliated ramus.	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C07E863FDB8FCA6FE83D5A3.taxon	etymology	Etymology The species name refers to the type locality, the Olo River, which is used for an old irrigation system, preserving traditional land use.	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C07E863FDB8FCA6FE83D5A3.taxon	materials_examined	Type material Holotype PORTUGAL – Vila Real • ♂; Lamas de Olo; 41.3688 ° N, 7.8006 ° W; 30 Oct. 2022; L. P. Da Silva leg.; MNCN 20.04 / 21010 (ex. LPS 488). Paratypes PORTUGAL – Vila Real • 1 ♀; Lamas de Olo; 41.3687 ° N, 7.8004 ° W; 30 Oct. 2022; L. P. Da Silva leg.; LPS 487 • 1 ♀; Lamas de Olo; 41.3687 ° N, 7.8007 ° W; 13 May 2023; L. P. Da Silva leg., JC 1051 (ex. LPS 762) • 1 ♀; Lamas de Olo; 41.3688 ° N, 7.8008 ° W; 13 May 2023; L. P. Da Silva leg.; LPS 763.	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C07E863FDB8FCA6FE83D5A3.taxon	description	Description Measurements. Maximum observed length: female 2.3 mm, male 2 mm. Coloration. Living specimens orange, progressively fading in ethanol (Fig. 28 A). Eye apparatus consists of large black ocellus. Integumentary characters. Integument with marked granulations (Fig. 28 A), five rows on cephalon, one on posterior margin. Three rows on pereonite I and two on other pereonites, one on posterior margin of each pereonite. One row of small granulations on posterior margin of each pleonite, more pronounced on first three pleonites. Appendages. Antennules with three segments, second shortest, third with three long aesthetascs (Fig. 29 A). Antennae very short (Fig. 29 B), barely extending beyond posterior margin of pereonite I, with tubercles bearing scale-setae. Flagellum with three segments, second one longer than others, with group of long aesthetascs. Buccal parts as in other species. Male sexual characters. Pereopod 1 (Fig. 29 C) and 2 with hyaline scales on merus and carpus on sternal edge. Pereopod 7 merus (Figs 28 B, 29 D) with strong blunt process in posterior third of sternal edge, bearing small seta. Pleopod I endopod rectangular (Figs 28 C, 29 E) with small distal lobe with rounded tip, having ciliated rami 1.4 × as long as basal segment. Exopod I triangular (Figs 28 D, 29 F) with rounded posterior internal lamina and strong notch at base of subequal ciliated rami (internal slightly shorter and thinner), each with very small setae. Pleopod II endopod broad (Figs 28 E, 29 G), straight, with hyaline membrane, distal segment twice as long as basal segment, ending in short tip reinforced with chitinous shaft. Exopod II trapezoidal (Fig. 29 H) with sinuous posterior margin and short, broad posterior-internal tip with rounded end, having strong ciliated stem surrounded by fan-shaped setae on internal and external margins.	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
F41887F51C07E863FDB8FCA6FE83D5A3.taxon	biology_ecology	Ecology Trichoniscoides oloensis sp. nov. is an epigean species (Table 1) found on dead wood and among leaf litter of Alnus lusitanica Vít, Douda & Mandák, Quercus pirenaica Willd. and other deciduous trees, in very wet soil.	en	Cifuentes, Julio, Da Silva, Luis P. (2026): The genus Trichoniscoides Sars, 1899 (Isopoda: Oniscidea: Trichoniscidae) from Portugal, with descriptions of three new species. European Journal of Taxonomy 1034: 271-305, DOI: 10.5852/ejt.2026.1034.3169, URL: https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/3169/14093
