Fusiform body, which is compressed slightly and streamlined. Pelvic fins are absent. The head is blunt, with a projecting forehead, and there is a groove above the eye. Opercular spines are flattened. Scales are dentroid and minute. The caudal peduncle has small accessory keels that flank the large caudal keel. The mouth is small and slightly protrusible. Metamorphosis from larvae to adults involves considerable change. Numerous juvenile characters are absent in adults. For example, juveniles possess jaw teeth, fin spines, and a rudimentary locking mechanism. Grows to 78.7 in (200 cm) in length.
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