What does the least studied shark in the world look like (4 photos)
She lives at a depth of 200 meters and weighs 200 kilograms. 
For example, the goblin shark is one of the most poorly studied shark species. 
Perhaps the least studied species of shark is the goblin shark (Mitsukurina owstoni), or, as it is otherwise called, the goblin shark, which lives in the Atlantic and Indian oceans. Science, indeed, knows little about this creature, unusual in its appearance. The goblin shark has very flexible jaws that extend outward when it catches prey. Like all sharks, it feeds on fish, for which its front – long and sharp – teeth are designed, but it will not refuse crustaceans and mollusks. The rear teeth of a shark are adapted precisely for chewing shells. 
This shark was first discovered in 1898 off the Jordanian coast of the Red Sea (in the Gulf of Aqaba). When they saw it, scientists thought that it was somehow a survivor of the Cretaceous period shark Scapanorhynchus, with which the goblin shark bears an incredible resemblance. To date, only 45 specimens have been seen. The largest known specimen reached just over three meters in length and weighed 210 kg. 
Today, scientists do not have enough information about this fish to say whether this species is endangered or not. In many ways, what makes them so rare to observe is the fact that the goblin shark lives at great depths.
Most of the individuals were seen at a depth of 270 m and 960 m. However, several of these sharks were seen at a depth of 1300 m. But African fishermen caught in their nets a coelacanth fish that was actually considered extinct.
