Eryma westphali Schweigert, Dietl & Roper 2000
Creators: name: Devillez, Julien
name: Charbonnier, Sylvain
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Erymidae
Eryma
Eryma westphali

description: Eryma westphali Schweigert, Dietl & Röper, 2000
(Fig. 7 G-J)
Eryma westphali Schweigert, Dietl & Röper, 2000: 6, pl. 3, figs 1-3. — Dietl & Schweigert 2001: 53, 110, fig. 85. — Garassino & Schweigert 2006: 8. — Feldmann & Titus 2006: 64.
Galicia westphali – Schweitzer et al. 2010: 25. — Hyžný et al. 2015: 375.
TYPE MATERIAL. — Holotype SMNS 24227. TYPE LOCALITY. — Nusplingen, Baden-Württemberg, Germany. TYPE AGE. — Kimmeridgian.
DESCRIPTION
Carapace
Short, spiny rostrum; fusiform intercalated plate; deep, wide cervical groove, joined to dorsal margin and to antennal groove; deep antennal groove; short, sub-horizontal gastroorbital groove; postcervical groove slightly curved forward, not joined to dorsal margin, joined to branchiocardiac groove at carapace mid-height, with a short ventral extension; branchiocardiac groove dorsally deep, narrowing in its ventral part, not joined to dorsal margin, joined to hepatic groove; hepatic groove concavo-convex.
Pleon and uropods
Somites with subtriangular pleurites, with a bulge on their basis; wide rounded uropods; uropodal endopods with a longitudinal carina; uropodal exopods with a small spine on external margin.
Thoracic appendages
Chelate P1; P1 propodus subrectangular, narrow and strongly elongated; P1 fingers shorter than propodus, slender, almost
straight or slightly curved inward, with a terminal hook; occlusal margin without teeth; P1 carpus short, subtriangular; thin P2-P5; P2-P3 chelate.
Ornamentation
Carapace with a dense, heterogeneous ornamentation; gastric and cardiac regions covered by tubercles; antennal, hepatic, and branchial regions covered by small rounded depressions; presence of an orbital spine; tergites and pleurites densely covered by small rounded depressions; presence of a strong antennal spine; smooth P1-P5.
DISCUSSION
This species is only known by three specimens. It is assigned to Eryma because of its typical carapace groove pattern (short gastro-orbital groove, postcervical and branchiocardiac grooves joined at carapace mid-height, hepatic groove concavo-convex) and the shape of the P1 chelae (elongated propodus, subrectangular, with slender fingers progressively narrowing to their distal extremity).
Among the erymid lobsters, Eryma westphali is the only species with heterochelous P1 chelae on a same specimen. Left propodus is more elongated and narrower than the right one, and the left fingers are straight and short while the right ones are curved and slightly longer (Fig. 7I, J). The strongly elongated and narrow P1 propodus with relatively short fingers of E. westphali is characteristic of the species. Only Eryma veltheimii (Münster, 1839) have P1 with a very long propodus, but it is clearly wider.
In E. westphali the branchial region is dorsally shorter than in E. georgeii, E. jungostrix, E. lerasi, E. modestiforme, and E. ventrosum. Contrary to E. lerasi and E. quadriverrucatum, E. westphali exhibits a ventral extension of the postcervical groove. Moreover, the dichotomy of the ornamentation of the carapace between the gastric and cardiac regions, covered by tubercles, and the remaining regions of E. westphali, covered by small depressions, is unique among the genus.
description: Published as part of Devillez, Julien & Charbonnier, Sylvain, 2021, Review of the Late Jurassic erymoid lobsters (Crustacea: Decapoda), pp. 25-73 in Geodiversitas 43 (2) on pages 40-42, DOI: 10.5252/geodiversitas2021v43a2, http://zenodo.org/record/4486479