Uca spinicarpa (basionym) Leptuca spinicarpa, commonly known as the spiny-wristed fiddler crab or the spined fiddler crab, is a species of fiddler crab native to coastal habitats along the Gulf of Mexico from northwestern Florida to Mexico.

[3][4] At one time, L. spinicarpa was reduced to a subspecies of L. speciosa,[5] but this is no longer accepted due to morphological, genetic, and behavioral differences.

[6] The carapace can be up to 23mm wide and is often green in color in the frontal area.

[7] Strongly raised tuberculate ridges are present on the palm of the male's major cheliped; a large tubercle is present on the carpus.

[6][7] The species lives in fresh to brackish water on intertidal banks and marshes with firm clay, clay-sand, or clay-mud substratum.