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DistributionDistribution: Antarctic, Atlantic, Indian, and Pacific. Scales cycloid. Whole body and postorbital region with scales. Lateral line scales 40-65. Tongue with strong and usually hooked teeth. Eyes large and tubular, oriented upward or slightly dorso-anteriorly. Dorsal fin with 5-10 rays. Anal fin with up to 39 rays; usually 17-27. Pectoral fins with 18-28 rays. Swim bladder lacking. Vertebrae 40-65. About 23 cm maximum length. Adults usually found in depths of 500-1000 m; larvae usually occuring in 100-200 m.