The name of this threatened species of crab (Uca arcuata) in Japanese is "shio maneki" or "tide caller." This refers to the way the males wave their large claw over their heads as if they beckon the tides to come in. Due to loss of their natural habitat these crabs are classified as vulnerable (VU).
Uca arcuata (Fiddler Crab)
A fiddler crab, sometimes known as a calling crab, may be any of approximately 100 species of semi-terrestrial marine crabs which make up the genus Uca. As members of the family Ocypodidae, fiddler crabs are most closely related to the ghost crabs of the genus Ocypode. This entire group is composed of small crabs – the largest being slightly over two inches across. Fiddler crabs are found along sea beaches and brackish inter-tidal mud flats, lagoons...