It is considered a "living fossil" by biologists and has been that way since the time of the dinosaurs. In other words, it was found in the Cretaceous oceans. Isn't that amazing?
It's the frilled shark
There is also a legend of the "sea basilisk" abroad, saying that it is a huge serpentine monster with gray-brown skin, a relatively large head, and many fins on its body, and it likes to attack passing ships the most.
Before that, most people basically didn't know about it, and the folk wrote them into myths and stories as sea monsters like sea snakes, and because of their terrifying appearance, they were included in the top ten unknown giant terrifying creatures of the deep sea.
It lives only in the deep sea of the Atlantic and Pacific oceans, and is known as a living fossil because of its resemblance to sharks from the Paleozoic era. Very rare, in 2007 a dying frilled shark was caught off the surface of Japan.
The head of the wrinkled gill shark is flat and broad, with a short, rounded snout and oval eyes. The body is slender and soft, almost eel-like, and the head has a reptilian appearance.