Glypheopsis trouvillensis Charbonnier, Garassino, Schweigert & Simpson 2013
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
Glypheidae
Glypheopsis
Glypheopsis trouvillensis

description: Glypheopsis trouvillensis Charbonnier, Garassino, Schweigert & Simpson, 2013 (Figs 2; 3)
Glypheopsis trouvillensis Charbonnier, Garassino, Schweigert & Simpson, 2013: 153, 154, fig. 331, table 5.
TYPE MATERIAL. — Holotype FSL-EM 80052.
TYPE LOCALITY. — Trouville-sur-Mer, Calvados, Normandy, France.
TYPE AGE. — Late Jurassic (late Oxfordian).
ADDITIONAL EXAMINED MATERIAL. — 24 specimens (MPV 2013.1.146.1-21, 2013.1.288.3, Hurtrelle coll.; IGR-PAL-153416, 153417, Bara coll.) from the Oxfordian of Cricqueboeuf, Calvados, France.
DESCRIPTION
See Charbonnier et al. (2013). Glypheopsis trouvillensis was described based upon one isolated carapace, which is probably a moulted specimen.Two new specimens (MPV 2013.1.146.1, 2) allow us to add some morphological details previously not provided in the original description.
Pleon
Subrectangular s1-s5 equal in size, with smooth tergum and pleuron; rounded s1-s5 pleura; s2-s5 pleura with marginal carina limited by a groove.
Thoracic appendages
Partially preserved P1 lacking distal extremities (carpus, propodus, and dactylus); P2 preserves only the subsquare basis; P3-P5 preserve basis, ischium, and incomplete merus; dorsal margin of subsquare P1 basis with one spine at level of ischiobasal articulation; subtriangular P1 ischium strongly enlarged at level of ischiomeral articulation; subrectangular P1 merus; smooth outer surface of P1 ischium and merus; dorsal and ventral margins of P1 ischium and merus covered by spines arranged in parallel rows; elongate P3 merus with smooth outer surface and spiny dorsal and ventral margins.
Ornamentation of carapace
Charbonnier et al. (2013: 154) described the ornamentation of the branchial region of the carapace as made by pits dorsally and tubercles medially and ventrally and a tuberculate pterygostomial region. Some additional specimens (MPV 2013.1.146.1-9, 11, 13-15, 19-21, IGR-PAL-153416, 153417) show that the ornamentation of the branchial region is more complex with the ventral area covered by small pits, the median area by small tubercles located inside pits, and the dorsal area by large pits.
DISCUSSION
The postcervical groove joining dorsally and ventrally to branchiocardiac groove, the presence of the cardiac and intercervical grooves and the absence of the gastro-orbital groove in additional specimens are all diagnostic characters of Glypheopsis. They are assigned to G. trouvillensis because they share with the holotype the three spiny cephalic carinae and the ornamentation of cephalic, cardiac, and branchial regions. Mainly, the ornamentation of the branchial region with a progressive gradation from ventral tubercles to dorsal pits is very typical of G. trouvillensis. We add all additional specimens collected in a fossiliferous locality nearby the type locality.
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 576, DOI: 10.5252/geodiversitas2023v45a19, http://zenodo.org/record/10066067