Indo-Pacific: Red Sea and East Africa (Ref. 3145) to the Hawaiian, Marquesas and Tuamoto islands, north to southern Japan, south to Lord Howe and Rapa islands. Presence in Somalia to be confirmed.

Presence of a horn or rostrum. Both caudal lobes prolonged into filaments. Adult males tend to have better developed horn, peduncular spines, and caudal filaments than females of the same size.

Inhabit channels, moats, lagoon and seaward reefs with strong surge. Benthopelagic. Typically occurring in small groups. Juveniles in shallow protected bays and harbours