Leptuca
Guides
Leptuca crenulata
Mexican fiddler crab
The Mexican fiddler crab is a small intertidal crab formerly classified in the genus Uca but transferred to Leptuca in 2016. Females exhibit active mate searching behavior, which is notable as this represents a reversal of typical sex roles in fiddler crabs where males usually search for mates. The species inhabits intertidal mudflats and shows the characteristic sexual dimorphism of fiddler crabs, with males possessing one greatly enlarged claw used for signaling and combat.