A New Family of Brachyuran (Crustacea: Decapoda: Goneplacoidea) from the Eocene of Java, Indonesia

A new family, Martinocarcinidae, must accommodate the monotypic genus Martinocarcinus Böhm, 1922. The genus displays a unique combination of dorsal, sternal and abdominal characters justifying placement in a new family. The Martinocarcinidae joins several other now extinct Eocene families that flourished at that time, supporting the long-held view that the Eocene was a time of radiation within the Brachyura.