Uca pugnax, Atlantic marsh fiddler crab Description Fiddler crab (Uca pugnax) from NOAA CSC.
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Uca pugnax, commonly known as the Atlantic marsh fiddler crab, is a species of fiddler crab that lives on north-eastern shores of the Atlantic Ocean. Uca pugnax is the most common species of fiddler crab on the east coast of the United States. Its natural range extends from Cape Cod to northern Florida. Order: Decapoda, Infraorder: Brachyura, Family: Ocypodidae, Genus: Uca, Species: Uca pugnax (S. I. Smith, 1870), Synonyms: Gelasimus pugnax S. I. Smith, 1870