A species of shark belonging to the family Hexabranchidae and the genus Hexabranchia. The body is elongated, with a sub cylindrical shape in the front and slightly flattened in the back. Slightly flattened head; There are no depressions above or below the tail base. Large deep-sea sharks that inhabit the outer slopes of continental or island shelves, generally inhabiting depths of 100-400 meters, but can reach depths of up to 1000 meters. They are occasionally captured on the surface of water. Mainly feeds on other small sharks, small bony fish, crustaceans, and squid. Ovulation can give birth to 9-20 young sharks per litter. Widely distributed in tropical and temperate coastal waters of the Atlantic, Indian Ocean, and Pacific Ocean. Distributed in the East China Sea, the waters near Taiwan, and the South China Sea in China.