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Cryptacanthodidae (wrymouth; subclass Actinopterygii, order Perciformes) A small family of coastal marine fish that have an elongate body, long dorsal and anal fins, oblique mouth, and lack pelvic fins. Cryptacanthodes maculatus (Atlantic wrymouth), 1 m long, often hides in burrows beneath the surface of the sea-bottom. Wrymouths are found in temperate waters of the Atlantic and Pacific.