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Leptuca uruguayensis, commonly known as the Uruguayan fiddler crab or the southwestern Atlantic fiddler crab, is a species of fiddler crab native to temperate and subtropical areas of the southeastern coast of South America.
More than 100 species of fiddler crabs make up 11 of the 13 genera in the crab family Ocypodidae. These were formerly members of the genus Uca. In 2016, most of the subgenera of Uca were elevated to genus rank, and the fiddler crabs now occupy 11 genera making up the subfamilies Gelasiminae and Ucinae. [33] [2] [34] Afruca
Afruca tangeri is one of the largest species of fiddler crab, with a carapace up to 50 millimetres (2.0 in) wide, [3] and up to 25 mm (1.0 in) long. [4] The males have one claw much larger than the other, which they use for communication. [5]
The claw can be much larger than the body, at up to 35 mm (1.4 in) long, or exceptionally up to 41 mm (1.6 in) long. [4] 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.
Mangrove crabs are predated on by wading birds, fish, sharks, [8] monkeys, hawks, and raccoons. [7] The larvae of mangrove crabs is a major source of food for juvenile fish in waterways near the crabs. [24] Adult mangrove crabs are food for the crab plover among other protected species. [17] To protect themselves the crabs can climb trees. [25]
There is noticeable sexual dimorphism in Minuca pugnax.Although both males and females are olive-brown in color, males have a carapace width of 15–23 mm (0.59–0.91 in), and a patch of royal blue on the carapace, while females lack the blue patch and are only 13–18 mm (0.51–0.71 in) across the carapace. [2]
It prefers areas of lower salinity than other fiddler crabs, [3] and can be found in great numbers along the banks of tidal streams, even at distances greater than 50 km (31 mi) from the sea. [ 4 ] Minuca minax was formerly in the genus Uca , but in 2016 it was placed in the genus Minuca , a former subgenus of Uca .
[1] [2] [3] The common name of these crabs is either the compressed fiddler crab, [4] or the orange-clawed fiddler crab, [5] (although this name is also used for Gelasimus vomeris). They are found on tidal mud flats adjacent mangroves and muddy tidal creek and river banks.