The goblin shark (Mitsukurina owstoni) is a rare, poorly understood species of deep-sea shark. Sometimes called a "living fossil", it is the only extant representative of the family Mitsukurinidae, a lineage some 125 million years old. This species looks unlike any other shark, with an elongated, flattened snout, highly protrusible jaws containing prominent nail-like teeth, and pink coloration. It is usually between 3 and 4 meters (10 and 13 ft) long when mature, though it can grow considerably larger. Goblin sharks 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.body is fairly slender and flabby. The two dorsal fins are similar in size and shape, both being small and rounded. The pectoral fins are also rather small and rounded. The pelvic and anal fins have long bases and are larger than the dorsal fins. The caudal peduncle is flattened from side-to-side and lacks keels or notches. The asymmetric caudal fin has a long upper lobe with a shallow ventral notch near the tip, and an indistinct lower lobe. The soft, semi-translucent skin has a rough texture from a covering of dermal denticles, each shaped like a short upright spine with lengthwise ridges. In life, this species is pink or tan due to visible blood vessels beneath the skin; the color deepens with age, and young sharks may be almost white. The fins' margins are translucent gray or blue, and the eyes are black with bluish streaks in the iris. After death, the coloration quickly fades to dull gray or brown. Adult sharks usually measure between three and four meters (10–13 ft) long. However, the capture of an enormous female estimated at 5.4–6.2 m (18–20 ft) long in 2000 showed that this species can grow far larger than previously suspected. The maximum weight on record is 210 kg (460 lb) for a 3.8 m (12 ft) long shark.
From : http://en.wikipedia.org/wiki/Goblin_shark