A New Xanthid Crab (Decapoda, Brachyura) From The Lower Eocene (Ypresian) Of Huesca (Aragon, Spain)

A recent revision of historical collections at the Museo Geologico del Seminario de Barcelona has resulted in the discovery of a new extinct genus of xanthid crab, Collinscarcinus n. gen., which is characterised by a subelliptical carapace outline, lateral margins with arched lobes with notches, an extremely downturned front, large, gently swollen dorsal regions and a complex system of dorsal grooves. Altogether, this is a peculiar set of characters, which allow this form to be differentiated from all other extinct and extant xanthid genera recorded to date.