Eryma Meyer 1840
Creators: name: Odin, Giliane P.
name: Charbonnier, Sylvain
name: Devillez, Julien
name: Schweigert, Günter
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Erymidae
Eryma

description: Genus Eryma Meyer, 1840
TYPE SPECIES. — Macrourites modestiformis Schlotheim, 1822, by subsequent designation of Glaessner(1929).
Eryma modestiforme (Schlotheim, 1822) (Fig. 6)
STUDIED MATERIAL. — Charbonnier & Garassino (2012) listed eight specimens: six specimens coming from Solnhofen (MNHN.F.A33507, B13448, B13450, B13452, B13463, MNHN.GG.2004/7462), one specimen from Eichstätt (B13446) and one specimen from an unknown locality (MNHN.GG.2004/8078-7471). Only two of them were figured (MNHN.F.B13450 and B13446); we thus figure three other specimens (MNHN.F.A33507, Fig. 6B; B 13452, Fig. 6E; and B13463, Fig. 6A) and add three new specimens, one specimen from Eichstätt (MNHN.F.A32408, Fig. 6H); one specimen from Painten (MNHN.F.A70906, Fig. 6G) and one specimen from an unknown locality (MNHN.F.A70905, Fig. 6C). 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, A33507, A70905, B13463, B13450 (Fig. 6 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 (Fig. 6C, D) and B13452 (Fig. 6E, F), 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 (Fig. 6H), 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, figured by Desmarest (1822: pl. 11, fig. 5), shows the typical mode of preservation and lithology of the Bavarian Lithographic Limestones (Fig. 6H) 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.
description: Published as part of 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, pp. 643-662 in Geodiversitas 41 (17) on page 652, DOI: 10.5252/geodiversitas2019v41a17, http://zenodo.org/record/3695414