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Large polychelidan lobsters with a rounded carapacefrom the Middle Jurassic La Voulte-sur-Rhône Lagerstätte:taxonomic clarifications

Abstract : Polychelidan lobsters (Crustacea: Decapoda) are abundant in the celebrated Middle Jurassic (Callovian)Lagerstätte of La Voulte-sur-Rhône (Ardèche, France). Among them, Eryon giganteus Van Straelen, 1923,is recognized by its large, rounded carapace. The generic assignment of this species has been particularlycomplicated, with many conflicting assignments proposed since the first description of the species. Thepresent study reinvestigates E. giganteus following the rediscovery of its lectotype. Careful examinationsreveal that the type material is composite: the lectotype belongs to a species of eryonid that wasdescribed recently as Cycleryon romani Audo, Schweigert, Saint Martin & Charbonnier, 2014, and isquite rare (six specimens); the rest of the material, and most specimens formerly assigned to E. giganteuscorrespond to an abundant species of Proeryon Beurlen, 1928 (33 specimens) that we herein describeas Proeryon charbonnieri n. sp. The present study also allows us to reinvestigate the generic assignmentof E. giganteus. Detailed observations allowed assigning E. giganteus to Soleryon Audo, Charbonnier,Schweigert & Saint Martin, 2014 based upon: the grooves marked across the dorsal part of carapace; aposterior carina near the posterior margin; and a hepatic carina between cervical and hepatic grooves.This taxonomic revision also leads to abandon Proeryon zehentbaueri, the replacement name whichwas proposed for Proeryon giganteus Beurlen, 1930.
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Submitted on : Tuesday, January 14, 2020 - 1:08:52 PM
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Denis Audo, Günter Schweigert. Large polychelidan lobsters with a rounded carapacefrom the Middle Jurassic La Voulte-sur-Rhône Lagerstätte:taxonomic clarifications. Geodiversitas, Museum National d'Histoire Naturelle Paris, 2018, 40 (9), pp.183-194. ⟨10.5252/geodiversitas2018v40a9⟩. ⟨insu-02438803⟩

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