What is the only known living shark that is a member of the Mitsukurina family?

The Goblin shark (Mitsukurina owstoni) is a rare species of deep-sea shark. Sometimes called a "living fossil", it is the only living representative of the family (Mitsukurinidae), a lineage some 125 million years old.

This pink-skinned animal has a distinctive profile with an elongated, flat snout, and highly protrusible jaws containing prominent nail-like teeth. It is usually between 3 and 4 m (10 and 13 ft) long when mature, though it can grow considerably larger such as one captured in the year 2000 that measured 6 m (20 ft).

Goblin sharks are known as benthopelagic creatures that inhabit upper continental slopes, submarine canyons, and seamounts throughout the world at depths greater than 100 m (330 ft), with adults found deeper than juveniles.

The common name "Goblin shark" is a translation of its old Japanese name Tenguzame, a Tengu being. Another name for this species is Elfin shark.

This species of shark hunts for teleost fishes, cephalopods, and crustaceans both near the sea floor and in the middle of the water column. Its long snout is covered with ampullae of Lorenzini that enable it to sense minute electric fields produced by nearby prey, which it can snatch up by rapidly extending its jaws.