Acanthurus leucosternon x nigricans, L
Southern Indonesia, ranging from Sumatra to west Flores and rare in Cocos and Christmas Is., eastern Indian Ocean, where the Indian Powderblue Surgeonfish is common. Found mainly around rocky reefs subject to strong currents and occurs alone or in small groups. Acanthurus cf leucosternon is best distinguished from Acanthurus leucosternon by the blue instead of white chest, dusky anal fin, and the yellow peduncular spine is not surrounded by yellow. Adults have a white horizontal blotch under the eye , similar to A.nigricans, and some ichthyologists presumed this species to be a hybrid between A.leucosternon and A.nigricans. Length to 20cm.