On the systematic placement of the fossil crab Lathahypossia aculeata (Busulini, Tessier & Visentin, 1984) (Crustacea: Decapoda: Brachyura)

The systematic placement of the iconic fossil crab, Lathahypossia aculeata (Busulini, Tessier & Visentin, 1984) (formerly in Titanocarcinus A. Milne-Edwards, 1864), from the Eocene of Italy is revised. The examination of two specimens that had the ventral and subcephalic features well preserved has allowed us to better understand the morphology of this species. As a result, Lathahypossia aculeata must be removed from the Hypothalassiidae (Eriphioidea), where it is now placed, and moved to the Xanthidae (Xanthoidea). The present work again highlights the importance of ventral characters in the study of fossil crabs and allows a more accurate systematic classification.