Leptuca subcylindrica, commonly known as the Laguna Madre fiddler crab or the puffed fiddler crab, is a sparsely-studied species of fiddler crab native to southern Texas and northeastern Mexico in the Gulf of Mexico.

[3][4] The carapace is tan to light orange in color and can be up to 25 mm wide.

The male lacks a tuberculate ridge on the palm of the major cheliped.

[1][2] Its gonopod is unlike other fiddlers crab in that the distal part of the inner process is divided and appears fringed.

[2] Some habitats include mud flats, algal beds, rivers and creeks.