Cometfish have large eyes, a large mouth, and elongated pelvic fins. The nocturnal large-finned cometfish originate in holes and under overhangs. When it is afraid, it hides in the holes, letting its tail protrude, which then looks like the head of a moray eel (Gymnothorax meleagris).
13 to 25 cm. Feeds on small crustaceans and fish.