In the western Indian Ocean , this species occurs from the Red Sea to South Africa , including Madagascar , the Seychelles , the Aldabra Group , Mauritius , and the Chagos Archipelago .
They are thought to prefer offshore islands , coral reefs and banks to depths of 800 m . They have been found in the western Indian Ocean : the Red Sea and of East Africa , including Madagascar , Seychelles , Aldabra Group , Mauritius and the Chagos Archipelago .