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DistributionDistribution: Atlantic, Indian and Pacific Oceans. Long, inferior mouths extending behind eyes. Gill openings 5, the fifth well before pectoral fin. Jaws not very protractile in Odontaspis and Pseudocarcharias; jaws very protractile and the rostrum projected in Scapanorhynchus (=Mitsukurina). All the known species are of large size up to 3.6 m or more. They occur in coastal and slope waters in tropical and temperate latitudes. They feed on a wide variety of bony fishes, other sharks, rays, squids and bottom crustaceans. Development is ovoviviparous, without a yolk-sac placenta but with uterine cannibalism.