Review of the Late Jurassic erymoid lobsters (Crustacea: Decapoda)

Abstract

Erymoid lobsters (Crustacea, Decapoda, Erymoidea) are an important component of Mesozoic crustacean faunas in Europe, especially during the Jurassic. With 36 species reported, these lobsters reach their highest diversity during the Late Jurassic. After the review presented here, 23 species belonging to Eryma Meyer, 1840 (11 species), Palaeastacus Bell, 1850 (2 species), Pustulina Quenstedt, 1857 (2 species) and Stenodactylina Beurlen, 1928 (8 species) remain valid. One new species is described: Stenodactylina shotoverigiganti n. sp., and Eryma pseudoventrosa Beurlen, 1928 is integrated to Stenodactylina. We also notice the oldest representative of Enoploclytia M'Coy, 1849, known by a single specimen unidentified at specific level. Eryma ventrosum (Meyer, 1835) is the most common species in Western Europe, and may be seen as emblematic of the Middle-Late Jurassic. Moreover, the lithographic limestones of Germany yield an exceptionally diversified erymoid fauna, with four genera (Eryma, Palaeastacus, Pustulina, Stenodactylina) and 11 species listed. All the Late Jurassic representatives of Palaeastacus were found in this lithology. Finally, the examination of some specimens allows the observation of the strong effects of the decortication on the ornamentation of the erymoids and the resulting taxonomic issues.

The decapod crustacean fauna from the Late Jurassic of Cricqueboeuf, Normandy (France)

“…8B, D-F). All these morphological characters are typical of E. ventrosum , which is well-known in the Callovian-Oxfordian deposits of Normandy (Devillez & Charbonnier 2021).…”

“…Devillez & Charbonnier (2021: 34, 36) provided an updated and very complete description of Eryma ventrosum . The specimens from Cricqueboeuf show the fusiform intercalated plate typical of the erymid lobsters and a carapace groove pattern typical of Eryma : cervical groove, strongly inclined dorsally, joined to dorsal margin and to antennal groove; short gastro-orbital groove, originating as a slight median inflexion of the cervical groove; postcervical groove joined to branchiocardiac groove at carapace mid-height; branchiocardiac groove usually strongly inclined, joined to the posterior extremity of hepatic groove; hepatic groove concavo-convex, joined to cervical groove; inferior groove convex posteriorly, joined to hepatic groove and to ventral margin, inflated pleural basis.…”

New findings of Decapoda (Crustacea) in the Callovian of the Ryazan region (Central European Russia)

“…The specimens are similar to E. ventrosum (von Meyer, 1835) from the Late Jurassic of Europe in having the junction of the postcervical and branchiocardiac grooves at the mid-height of the carapace, as well as having the same cervical, hepatic, gastro-orbital, and inferior groove patterns. However, the studied material differs from typical E. ventrosum (Devillez and Charbonnier, 2021, figs. 4, 5) by the presence of a few large spines at the space between the cephalic rows (absent for E. ventrosum ); serrate rostrum (smooth for E. ventrosum ); ornamentation by tubercles interspersed with circular depressions or without pits (tubercles with crescent-shaped depressions for E. ventrosum ).…”

First record of an erymid lobster (Crustacea, Decapoda) from the upper Bajocian of Northwest Bulgaria

“…The terminology and taxonomic views adopted herein mainly follow Devillez and Charbonnier (2017, 2021 and 9), by subsequent designation (Glaessner, 1929, p. 150).…”

“…Remarks. The most extensive recent discussions of Eryma are those of Hyžný et al (2015), and Devillez and Charbonnier (2017, 2021. Following these authors, the chelae of Eryma can easily be distinguished based on the shape of the propodus, its characteristic dorsoventral flattening and narrow margins, and the style of ornamentation, which is devoid of spines but is dense, fine and tuberculate.…”