Body depressed, more so anteriorly; rostrum rather narrow, not coverging to its tip; rostral teeth 23–37 (usually 24–31) peg or awl-like, flattened and elongate, with variable posterior groove at all ages; pectoral fin bases broad; caudal fin with posterior margin convex in young and straight in adults, no lower lobe or fleshy projection on upper lobe. Body colour uniformly olive greenish brown above, white below.