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Taxonomy
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Genus Uca - Fiddler Crabs

Phylum Arthropoda - Arthropods
Subphylum Crustacea - Crustaceans
Class Malacostraca - Malacostracans
Superorder Eucarida - Eucarida (Crabs, Crayfish, Shrimp, etc.)
Order Decapoda - Crabs, Crayfishes, Lobsters, Prawns, and Shrimp
Infraorder Brachyura - True Crabs
Family Ocypodidae - Fiddler Crabs and Ghost Crabs
Genus Uca - Fiddler Crabs

Species crenulata - Mexican Fiddler Crab
Species longisignalis - Longwave Gulf Fiddler
Species minax - Red-jointed Fiddler Crab
Species pugilator - Atlantic Sand Fiddler Crab
Species pugnax - Atlantic Marsh Fiddler Crab
Species thayeri - Atlantic Mangrove Fiddler Crab