They are named “fiddler” because the male holds one claw, always much larger than the other, somewhat like a violin. You can identify a fiddler crab species by examining its enlarged claw: the sand fiddler crab’s claw is smooth on the underside. Species The following lists all 105 of the currently recognized species of fiddler crab, as well as 5 fossil species (marked with ☠ ). They are most closely related to the Ocypode (ghost crabs).There are currently 105 recognized extant species. See the complete name index for alternate species names and spellings. Fiddler crab, also called calling crab, any of the approximately 65 species of the genus Uca (order Decapoda of the subphylum Crustacea). Fiddler crabs, sometimes known as calling crabs, are a large group of crustaceans which make up the Ocypodidae family along with ghost crabs. Both claws in the female are relatively small. There are roughly 100 closely related species belonging to the genus Uca (Fiddler Crabs). Fiddler crabs are small, semi-terrestrial crabs are characterized by extreme cheliped asymmetry in males. In males, claws can be regenerated if they are lost. Fiddler crabs breathe oxygen from the atmosphere. If the claw is not smooth on the underside and had red joints, it is a red-jointed fiddler crab. Otherwise, it is a marsh fiddler crab.
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