Dorsal spines: 0; Dorsal soft rays: 6; Anal spines: 0; Anal soft rays: 9 - 15. Compressed body, flattened on the dorsal side and head, careened on the ventral side behind the pelvic fins. Large mouth, with numerous teeth and a prominent lower jaw, upwardly directed. Short dorsal fin placed very posterior on the back, inserted behind the longer anal fin. Large development of the pectoral fins, enlarged and wing-like. Very advanced position of the pelvic fins, with 4 elongated, filamentous rays. The caudal fin is long, pointed and rather ragged, with the two centre rays the longest. Large cycloid scales, subcircular, with rounded but evident laterobasal angles: 26-30 lateral line scales, 21-26 predorsal scales. Extremely brilliant colo