''Dissodactylus mellitae'', the sand-dollar pea crab, is a species of

pea crab The pea crab, ''Pinnotheres pisum'', is a small crab in the family Pinnotheridae that lives as a parasite in oysters, clams, mussels, and other species of bivalves. Description Pea crabs are small crustaceans about the size of a pea or dime, wit ...

in the family

Pinnotheridae The Pinnotheridae are a family of tiny soft-bodied crabs that live commensally in the mantles of certain bivalve molluscs (and the occasional large gastropod mollusc species in genera such as ''Strombus'' and ''Haliotis''). '' Tunicotheres moseri ...

. It is found in the western Atlantic Ocean.

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Further reading