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Uca pugilator
''Uca pugilator'', the sand fiddler crab is a species of fiddler crab that is found from Massachusetts to the Gulf of Mexico. It lives in burrows in coastal and estuarine mud-flats, and can be extremely abundant. It can be differentiated from its congeners ''U. pugnax'' and ''U. minax'' by the smoothness of the inside of its claws. One claw is larger than the other, and can be much larger than the crab's body, at up to long.
==Description==
The carapace is square in shape, tapering slightly to the rear; it can reach a width of , but is typically up to wide and long. The space between the eyes is much shorter than the eyestalk. The males have one extremely enlarged chela (claw), which they use to claim their territory and fight with other males. The claw can be much larger than the body, at up to long, or exceptionally up to long.〔 It is common for males to lose claws in the battles. When this happens, the claw regenerates and the opposite side begins to enlarge. Fiddler crabs are right or left clawed. The inside of these claws are also very smooth, unlike its other close relatives ''Uca pugnax'' and ''Uca minax''.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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