Abyssophthalmus aff. bellaii ( Crônier & Boursicot, 2009 )

Chény, Cédric, Charbonnier, Sylvain & Audo, Denis, 2023, Middle Jurassic lobsters (Crustacea, Decapoda) from Normandy, France, Geodiversitas 45 (4), pp. 139-161 : 158

Abyssophthalmus aff. bellaii ( Crônier & Boursicot, 2009) ( Figs 6F ; 12D )

Nodoprosopon? bellaii Crônier & Boursicot, 2009: 1279, 1280 , fig. 3h-j, pl. 2[figs 1-3].

TYPE MATERIAL. — Holotype by monotypy USTL 3852 (Boursicot coll.).

TYPE LOCALITY. — Montreuil-Bellay, Maine-et-Loire department, France.

TYPE AGE. — Middle Jurassic, early Callovian (Gracilis ammonite biozone).

EXAMINED MATERIAL. — One isolated carapace MNHN.GG.Gg2005- 8347d, associated to specimen MNHN.GG.Gg2005-8347c of Glyphea dressieri .

DESCRIPTION

Carapace

Carapace longer than wide; carapace groove pattern: see diagnosis of Abyssophthalmus ; lateral margins parallel sided; protogastric region with strong tubercle differentiated from slightly inflated hepatic region; hepatic region with strong tubercle; inflated mesogastric region; wide urogastric lobe; pentagonal cardiac lobe; inflated mesobranchial region; inflated epibranchial lobe; posterior margin strongly concave axially;

DISCUSSION

Nodoprosopon bellaii was tentatively assigned to Abyssophthalmus by Krobicki & Zatoń (2016), followed by Schweitzer et al. (2018). We concur with this interpretation. The general morphology and the ornamentation of the present carapace recall that of Abyssophthalmus aff. bellaii .

Figures

FIG. 6. — Glyphea dressieri Meyer in Bronn, 1837 from the Upper Callovian of Sainte-Scolasse-sur-Sarthe (Bachelier coll.): A, B, MHNLM 2008.12.612.5, female specimen, detail of P1 showing short propodus and dactylus and line drawing; C, D, MHNLM 2008.12.613.2, male specimen, detail of P1 showing elongate propodus and dactylus and line drawing;E, MHNLM 2008.12.613.2, male specimen,showing elongate P1 propodus and dactylus and pleonal somites with pointed tergopleura; F, MNHN.GG.Gg2005-8347c, female specimen, showing short P1 propodus and dactylus and pleonal somites with rounded tergopleura; note the brachyuran crab carapace (white arrow). Abbreviations: ca, carpus; da, dactylus; me, merus; P1-P5, pereiopods 1 to 5; pr, propodus; sp, spine. Photographs: A, C, E, Falconnet; F, L. Cazes. Line drawings: C. Chény. Scale bars: 1 cm.

FIG. 12. — Decapod crustaceans from the Upper Callovian of Sainte-Scolasse-sur-Sarthe area: A, B, Glyphea muensteri Meyer, 1840, IGR 103397 (Marollesles-Braults), isolated carapace, right lateral view and line drawing; C, Glyphea muensteri, MHNLM 2008.12.613.14 (Ste-Scolasse, Bachelier coll.), carapace and fragments of pereiopods, left lateral view; D, Abyssophthalmus aff. bellaii (Crônier & Boursicot, 2009), MNHN.GG.Gg2005-8347d (Ste-Scolasse, Bachelier coll.), carapace,dorsal view; E, F, Eryma ventrosum (Meyer, 1835), MHNLM 2008.12.613 (Ste-Scolasse, Bachelier coll.), fragment of carapace, left lateral view and line drawing; G-I, Eryma ventrosum MHNLM 2008.12.613.8 (Ste-Scolasse, Bachelier coll.), butterfly-shaped carapace split into two half carapaces (exuvia), dorsal