Gulf Marsh Fiddler Crab, Uca longisignalis (Fiddler Crab of the Week)

The Gulf Marsh Fiddler Crab, Uca longisignalis, is found along the Gulf of Mexico coast of the United States, from northwestern Florida through Texas. It’s a medium-sized species, sometimes mixed up with close relatives such as Uca minax or Uca rapax. It has a medium to pale turquoise/blue carapace, brown legs, and a white/yellow major claw.

The name of this species (essentially “long signalling”) comes from its extended waving and acoustic display relative to similar species from which it was originally distinguished.

The Gulf Marsh Fiddler has not been the primary focus of many studies, although it has often been examined in comparativeĀ cross-species studies, particularly by Carl Thurman and his students and collaborators.