Tags: Crustacean.
Uca redirects here. For other use see UCA.A fiddler crab sometimes known as a calling crab may be any of approximately 100 species of semi-terrestrial marine crabs which make up the genus Uca. As members of the family Ocypodidae fiddler crabs are most closely related to the ghost crabs of the genus Ocypode. This entire group is composed of small crabs – the largest being slightly over two inches across.
