Eryma ventrosum
Creators: name: Charbonnier, Sylvain
name: Garassino, Alessandro
name: Gendry, Damien
name: Devillez, Julien
name: Picot, Laurent
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Erymidae
Eryma
Eryma ventrosum

description: Eryma ventrosum (Meyer, 1835)
(Figs 7; 8)
Glyphea ventrosa Meyer, 1835: 329.
Eryma ventrosum – Devillez & Charbonnier 2021: 32, 33-35, figs 3-5 [cum syn.].
TYPE MATERIAL. — Holotype housed at the University of Strasbourg and destroyed by fire in 1967, cast MNHN.F.B12484.
TYPE LOCALITY. — Frétigney, Haute-Saône, Burgundy, France.
TYPE AGE. — Late Jurassic (Oxfordian).
ADDITIONAL EXAMINED MATERIAL. — 89 specimens including nine articulated specimens with partially preserved pereiopods (MPV 2013.1.288.34, 43, 45, 47, 52, 55, 56, 60, 61). — 46 isolated, more or less complete carapaces (MPV 2013.1.164.1, 2013.1.288.1, 2, 4-16, 18, 19, 22-24, 27-33, 37, 38, 41, 42, 46, 49, 53, 54, 57-59, 77-83). — Eight pleons with or without telson or tail fan (MPV 2013.1.288.20, 25, 48, 50, 51, 74, 87, 88). — 16 isolated P1 chelae more or less complete (MPV 2013.1.288.17, 21, 26, 35, 36, 39, 40, 44, 63, 64, 68, 71, 73, 76, 86, 89). — Five isolated P1 dactylus and index (MPV 2013.1.288.62, 66, 67, 69, 85). — Five isolated P1 carpomeral articulations (MPV 2013.1.288. 65, 70, 72, 75, 84). All the samples are from the Oxfordian of Cricqueboeuf, Calvados, Normandy, France.
DESCRIPTION AND DISCUSSION
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.
The specimens from Cricqueboeuf have a cervical groove slightly inflected, a short gastro-orbital groove, slightly curved postcervical and branchiochardiac grooves, joined at carapace mid-height, a ventral extension of the postcervical groove, an inflated ω area, a dense, fine ornamentation made of tubercles and crescent-shaped depressions, orbital and antennal rows of tubercles, elongated P1 chelae with a subrectangular propodus which is compressed dorso-ventrally, bearing long thin fingers, progressively curved inward, and armed with numerous teeth. In addition, some specimens show rounded stalked eyes with a well-preserved framework of subsquare ommatidia (Fig. 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).
description: Published as part of Charbonnier, Sylvain, Garassino, Alessandro, Gendry, Damien, Devillez, Julien & Picot, Laurent, 2023, The decapod crustacean fauna from the Late Jurassic of Cricqueboeuf, Normandy (France), pp. 573-588 in Geodiversitas 45 (19) on page 583, DOI: 10.5252/geodiversitas2023v45a19, http://zenodo.org/record/10066067