"The only representative of found by the was Temnocephala semperi . This species was first found by on s in and , from the plains up to an altitude of 5000 (1872, p. 307). It has since proved to have a wide distribution in the Oriental Region ... The creatures are extremely contractile and their great activity is most striking—indeed it is apt to be startling the first time living specimens are seen. They live, often in large numbers, on the lower surface of the body and among the basal joints of the legs of their host, which is apparently always a crab of the genus ' ... When separated from its host, T. semperi stands and waves its tentacles around, as though trying to perceive a new one, or crawls rapidly about. Occasionally, when it is greatly irritated, the tentacles are doubled back and tucked away beneath the concave ventral surface of the body."