Eryma major Oppel, 1861

Devillez, Julien & Charbonnier, Sylvain, 2021, Review of the Late Jurassic erymoid lobsters (Crustacea: Decapoda), Geodiversitas 43 (2), pp. 25-73 : 39

Eryma major Oppel, 1861

( Fig. 7 A-C)

Eryma major Oppel, 1861: 358 ; 1862: 37, pl. 8, fig. 3. — Schweitzer et al. 2010: 24. — Devillez et al. 2016: 524.

Erymastacus major – Schweigert et al. 2000: 8, pl. 3, figs 4-5. — Dietl & Schweigert 2001: 54, fig. 88. — Schweigert & Garassino 2003: 178, fig. 2B. — Hyžný et al. 2015: 375, 376.

TYPE MATERIAL. — Holotype SMNS 3682 . TYPE LOCALITY. — Nusplingen, Baden-Württemberg, Germany. TYPE AGE. — Kimmeridgian.

DESCRIPTION

Thoracic appendages

Chelate P1; elongated P1 propodus, subrectangular, dorsoventrally compressed, with a longitudinal bulge on ventral surface; narrow dactylar bulge, slightly bulged, not posteriorly delimited by a groove; slender, elongated fingers, almost straight; occlusal margins with wide conical teeth, regularly spaced; P1 carpus short, subtriangular; elongated P1 merus.

Ornamentation

P1 propodus and fingers densely covered by fine tubercles.

DISCUSSION This species is only known by some isolated P1, mainly from the lithographic limestones of southern Germany. The subrectangular, dorso-ventrally compressed propodus with long and narrowing fingers justifies the assignation to Eryma . Eryma major is only known by some fragments of P1, so the comparisons are restricted to the species for which the P1 are also known ( E. georgeii , E. jungostrix , E. lerasi , E. mandelslohi , E. modestiforme , E. quadriverrucatum , E. veltheimii , E. ventrosum , E. westphali ). The straight fingers of E. major are clearly distinct from the curved ones of E. georgeii , E. lerasi , E. mandelslohi , E. veltheimii , E.ventrosum , and E.westphali . The propodus of E. major is also shorter than that of E. veltheimii and E. westphali . The propodus of E. major is covered by tubercles while that of E. veltheimii and E. westphali is smooth and that of E. modestiforme is covered by small depressions.

Figures

FIG. 7. — Eryma major Oppel, 1861, Eryma veltheimii (Münster, 1839) and Eryma westphali Schweigert, Dietl & Röper, 2000 from the Kimmeridgian of Germany: A, holotype SMNS 3682 of E. major from Egesheimer;B, specimen SMNS 67655 of E. major from Gerhausen; C, specimen SMNS 64371 of E. major from Nusplingen; D-F, holotype BSPG AS VII 186 of E. veltheimii from Kehlheim: part (D), counter-part (E), details of telson and uropods (F); G-J, holotype SMNS 24227 of E. westphali from Nusplingen: general view (G), schema of the carapace (H), schema of left chela (I), schema of right chela (J); C, specimen SMNS 63733 from Nusplingen. Abbreviations: a, branchiocardiac; as, antennal spine; b, antennal groove; b1, hepatic groove; c, postcervical; d, gastro-orbital groove; e1e, cervical groove; ip, intercalated plate. Black arrows show the spines. Photographs and line drawings: J. Devillez. Scale bars: 1 cm.