Dorsal?spines?(total): 0;?Anal?spines: 0;?Anal?soft rays: 17 - 25. Body depth increasing with size of fish, 40 to 70 % standard length in fishes over 10 cm. Second supra-maxilla a mere splint. Longest gill rakers on lower part of arch less than corresponding gill filaments. Hind edges of scales toothed, the teeth thinner than the gaps between them; a median series of pre-dorsal scales. A large black spot behind gill opening.