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Dark grey tiny crab, not more than 2cm across the body. Males (pic No 2 and 3) wave one disproportionately large arm/claw - it seems that enormous claw can be on any side of the body, saw lefties and righties equally... Females (pics 1 and 3) have two small claws.
Found on sandy beaches and brackish lagoons around Freetown, in mangrove ecosystem - coastal ecosystem composed mainly of Red Mangrove tree (Rhizophora mangle, pic No 4).
Earlier, it seems that all fiddler crabs were classified into the same genus, genus Uca of Ocypodidae family. This has changed in 2016, and fiddler crabs constitute 11 genera today. I kept the old classification as I don't really know how to ID these crabs...