Uca leptodactyla (basionym) Leptuca leptodactyla, commonly known as the thin-fingered fiddler crab or the western Atlantic fiddler crab, is a species of fiddler crab native to the western Atlantic coast of the Americas.

[1] Previously a member of the genus Uca, the species was transferred in 2016 to the genus Leptuca when Leptuca was promoted from subgenus to genus level.

[4] The range of the crab includes southern Florida, Mexico, the West Indies, Venezuela, and Brazil.

[1][5][6] Within Brazil, the crab is present along the coast between the states of Maranhão and Santa Catarina.

[5] The species lives in brackish and saline environments, including mangrove stands and intertidal sand flats.