Distinctive Characters: Dorsal fin with 8 spines and 13-16 rays. Anal fin usually with 2 spines and 12-13 rays. Pectoral fin with 17-18 rays. Body depth 2.0-2.4 in standard length. Body oblong and compressed. Pelvic fins very long, reaching beyond spinous portion of anal fin. Preopercular margin coarsely serrate. Colour: Light yellow with two dark brown bars crossing body, one through eye and the other across hind part of body but curving forward to include spiny dorsal.
Habitat and Biology: A coral reef species. Secretes skin toxin grammistin under stress.
Distribution: Indo-West Pacific.
Remarks: Both Diploprion bifasciatum and the related Grammistes sexlineatus are relatively uncommon in the Maldives, but neither could be described as rare. Previously recorded under the family Grammistidae.