The species lived around North America, Eastern Europe, Asia, and Australia 290 million years ago. Others suggested it was connected to the tail of the creature, while others suspected it protruded from the upper or lower jaw of the animal. In fact, the Helicoprion looks like it has a circular saw wedged in its mouth. Helicoprion Helicoprions were prehistoric shark-like fish with curled-up teeth resembling circular saws.Īn underwater predator, this prehistoric shark was best known for its circular, toothy saw mouth which was a natural defense tool. It has been estimated that over 100 species of Plesiosaurs have been found since the discovery of the first plesiosaur bones. In search of fish and other food sources, they propelled themselves through the water with their limbs. There are some who believe the Loch Ness Monster sightings are the remains of plesiosaurs surviving on the island of Loch Ness. You could almost compare them to the mythical Loch Ness monster. These swimming reptiles had large bodies and small heads. Plesiosaurs Plesiosaurus fossils were discovered for the first time in 1821.ĭuring the Jurassic period, Plesiosaurs dominated the oceans. The remains of some of these creatures have been found in extremely arid environments of today, suggesting that they once roamed the oceans 65 million years ago. During the Cretaceous period, Tylosaurus was an apex predator and deadly hunter. It was one of the largest mosasaurs to ever exist, measuring over 45 feet long. It was an enormous marine reptile and a mosasaur. Tylosaurus is the first extinct creepy sea animal on the list. Tylosaurus Tylosaurus was the largest of the marine reptiles called mosasaurs, growing up to 45 feet (14 meters) long. Let’s take a look at ten extinct creepy sea animals that you won’t believe ever existed! 1. One of these interesting discoveries is that the ocean used to be home to some prehistoric monsters that are extinct today.

Although we are still learning a lot about the ocean, there are a few things that we have learned that are interesting. Deep-sea exploration has much to teach us. We know very little about more than eighty percent of the ocean due to the lack of mapping, observation, and exploration.

A large portion of the ocean is largely unknown and unexplored.

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