 Examination of specimens of both species supported the separation, including difference in shell sculpture, hinge morphology, and size of the pallial cavity.A phylogenetic analysis of extant species failed to define the exact evolutionary history of "C. cancellata" and "C. elevata".Separation of the two species suggests an ancient faunal division in the western Atlantic between the northern Caloosahatchian Province and the southern Atlantic Gatunian Province.