Physical Characteristics

Small, elongate fish, reaches 1.4 in (3.5 cm) total length. Lacks scales. Head with minute eyes, and a "chinlike" forward projection of the lower jaw. Six or seven small flaps project from the lower edge of the preoperculum, just behind the mouth, and five or six flaps project from the lower edge of the operculum covering the gills. There is a single, long, dorsal fin, and a long anal fin. Specimens from the Indian Ocean have fewer opercular flaps than those from the Pacific, and might represent a different species.

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