Helice tridens is a species of crab which lives on mudflats around the coasts of Japan and the Korean Peninsula.

[4] The species appears to be adversely affected by the presence of raccoons (Procyon lotor), an invasive predator.

[4] H. tridens has a salinity requirement which lies between those of two other estuarine crabs in Japan, Helicana japonica and Chiromantes dehaani.

[5] Smaller individuals shelter in burrows in reed marshes, apparently in order to avoid cannibalism; this may also be the reason for the migration of larger individuals to brackish water lagoons in summer, when the crabs exceed their carrying capacity.

[6] Helice tridens was first described by Wilhem de Haan in an 1835 volume of Fauna Japonica, as Ocypode tridens.