Eryma Meyer, 1840

Odin, Giliane P., Charbonnier, Sylvain, Devillez, Julien & Schweigert, Günter, 2019, On unreported historical specimens of marine arthropods from the Solnhofen and Nusplingen Lithographic Limestones (Late Jurassic, Germany) housed at the Muséum national d’Histoire naturelle, Paris, Geodiversitas 41 (17), pp. 643-662: 652

publication ID

http://doi.org/ 10.5252/geodiversitas2019v41a17

publication LSID

lsid:zoobank.org:pub:urn:lsid:zoobank.org:pub:541CF827-F02E-4086-8FB0-2C0033DD429A

DOI

http://doi.org/10.5281/zenodo.3703584

persistent identifier

http://treatment.plazi.org/id/03C23C58-FFE7-FFDB-1B35-83B3FAEEF8A7

treatment provided by

Valdenar

scientific name

Eryma Meyer, 1840
status

 

Genus Eryma Meyer, 1840  

TYPE SPECIES. — Macrourites modestiformis Schlotheim, 1822, by subsequent designation of Glaessner(1929).

Eryma modestiforme ( Schlotheim, 1822)   ( Fig. 6 View FIG )

STUDIED MATERIAL. — Charbonnier & Garassino (2012) listed eight specimens: six specimens coming from Solnhofen (MNHN.F. A33507 View Materials , B13448 View Materials , B13450 View Materials , B13452 View Materials , B13463 View Materials , MNHN.GG.2004/7462), one specimen from Eichstätt ( B13446 View Materials ) and one specimen from an unknown locality (MNHN.GG.2004/8078-7471). Only two of them were figured (MNHN.F. B13450 View Materials and B13446 View Materials )   ; we thus figure three other specimens ( MNHN.F. A33507 View Materials , Fig. 6B; B View Materials View FIG 13452, Fig. 6E View FIG ; and B13463 View Materials , Fig. 6A View FIG ) and add three new specimens, one specimen from Eichstätt ( MNHN.F. A32408 View Materials , Fig. 6H View FIG )   ; one specimen from Painten ( MNHN.F. A70906 View Materials , Fig. 6G View FIG ) and one specimen from an unknown locality ( MNHN.F. A70905 View Materials , Fig. 6C View FIG ). Collections Boué, Schwarzchild, A. Milne-Edwards, Hoffstetter, Manchester Museum, Férussac, Sauzières   .

COMMENTS

Eryma modestiforme   and E. veltheimii ( Münster, 1839) are the two species encountered in the Solnhofen Lithographic Limestones, the former being the most common. E. modestiforme   is known by numerous specimens, almost complete, stored notably in European palaeontological collections (e.g. Paris, Berlin, London, Brussels, Basel). Among the MNHN collection, four specimens clearly show the intercalated plate characteristic of the erymid lobsters: MNHN.F. A32408 View Materials , A33507 View Materials , A70905 View Materials , B13463 View Materials , B13450 View Materials ( Fig. 6 View FIG A-D, H; see also Charbonnier & Garassino 2012: fig. 3b). All the specimens exhibit a short P1 propodus with a dense ornamentation, allowing us to ascribe the fossils to the species E. modestiforme   (the propodus is more elongate and smooth in E. veltheimii). Moreover, three specimens show additional characters, diagnostic of E. modestiforme   : 1) on the specimens MNHN.F. A70905 View Materials ( Fig. 6C, D View FIG ) and B13452 View Materials ( Fig. 6E, F View FIG ), the carapace groove pattern, in particular the junction between the postcervical and the branchiocardiac grooves ( Devillez et al. 2016; Devillez & Charbonnier 2017), is easily identifiable; and 2) the morphology of the P1 chelae of the specimen MNHN.F. A32408 View Materials ( Fig. 6H View FIG ), shows a subrectangular propodus, thin fingers progressively narrowing to their distal extremity and without teeth on their occlusal margins.

The historical specimen MNHN.F. A32408 View Materials , figured by Desmarest (1822: pl. 11, fig. 5), shows the typical mode of preservation and lithology of the Bavarian Lithographic Limestones ( Fig. 6H View FIG ) but the locality of this specimen may be misleading. Desmarest (1822: 136) refers to “Aichstedt”, which is also the locality indicated on the original label, while the locality “Aichtät” is specified on the specimen. In a letter about the Franconian geology to A. Brongniart, L. de Buch (1823) evokes the lithographic limestones exploited at “Eichstedt” and “Solenhofen”, in the Altmuhl valley. However, there is no locality spelled “Eichstedt” next to the Altmühl River (instead, Eichstedt (Altmark) is a city located approx. 80 km west to Berlin) but “Eichstätt”. Thus, the designations “Aichtät”, “Aichstedt” and “Eichstedt” in the mentioned publications are likely orthographic variations referring to the same locality, nowadays spelled Eichstätt.

MNHN

Museum National d'Histoire Naturelle