Recorded at 1570 meters.
Habitat: bathydemersal. Lives on the outer continental and insular shelves and upper slopes. Feeds on squid and various bottom fishes. Strange shark because of its 6 gill slits and because the first gill slit nearly encircles the head. Ovoviviparous with 8-15 pups (Ref. 6871). Size at birth 40-60 cm (Ref. 6871). Off Japan, it reproduces all year round. Teeth are sharp enough to inflict lacerations on the hands of the unwary scientist examining its mouth.
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