Calvactaea

Calvactaea tumida is a species of crabs in the family Xanthidae, the only species in the genus Calvactaea.^[1][2]

Calvactaea
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Malacostraca
Order:	Decapoda
Suborder:	Pleocyemata
Infraorder:	Brachyura
Family:	Xanthidae
Genus:	Calvactaea Ward, 1933
Species:	C. tumida
Binomial name
Calvactaea tumida Ward, 1933

Found primarily off the coast of New South Wales, Australia, as well as, Sri Lanka, China, Taiwan, and Japan.^[3]