D1 V/43; D2 absent; P1 22; P2 absent; A III/39. Body color grey-brown, with a blue/grey tinge; lower portion or head and body lighter; fins brownish with dark edge. Young individuals with dorsal and anal fins black; caudal fin yellowish/black. Body diamond-shaped, fairly deep and compressed. Dorsal and anal fins long, spines present only in young specimens. Pectoral fins long, falcate; pelvic fins absent in adults. Caudal fin forked.