A new Middle Jurassic (Bajocian) homolodromioid crab from northwest France; the earliest record of the Tanidromitidae

René H. B. Fraaije^1,*, Barry W. M. van Bakel^1,2, Danièle Guinot³, John W. M. Jagt⁴

¹ Oertijdmuseum De Groene Poort, Bosscheweg 80, NL-5283 WB Boxtel, the Netherlands.
² Naturalis Biodiversity Center, P.O. Box 9517, NL-2300 RA Leiden, the Netherlands.
³ Département Milieux et peuplements aquatiques, Muséum national d’Histoire naturelle, 61 rue Buffon, CP 53, F-75231 Paris Cedex 5, France.
⁴ Natuurhistorisch Museum Maastricht, de Bosquetplein 6-7, NL-6211 KJ Maastricht, the Netherlands.

^* This email address is being protected from spambots. You need JavaScript enabled to view it.

Abstract

A new homolodromioid, Tanidromites maerteni, the earliest member of the genus and family, is recorded from the lower upper Bajocian (Niortense Zone) of Calvados, northwest France. It is noted that carapace morphologies of other Jurassic brachyuran taxa within the family Prosopidae are closely similar to those of tanidromitids, and that diagnoses of recently erected Jurassic families and genera partially overlap or have conflict among them. Thus, the taxonomy of the earliest brachyuran groups appears to be less stable than currently thought. In recent years, knowledge of primitive extinct brachyurans has greatly benefitted from findings made by amateur collectors, the present paper included.

Keywords: Crustacea, Homolodromioida, Tanidromitidae, Middle Jurassic, France, new species.