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Icosteidae (ragfish; subclass Actinopterygii, order Perciformes) A monospecific family (Icosteus aenigmaticus) of large (more than 2 m) marine fish that have a blunt snout, small eyes, and a distinct hump in front of the dorsal fin. The dorsal and anal fins are long, the pectoral fins are absent in adults. There is a considerable difference between the juvenile and adult stages, juveniles possessing a very deep body. Icosteidae occur in the N. Pacific.