The gigantic marine predators known as tylosauruses are not true dinosaurs, but have several similarities to them. They are adapted to life in the ocean, with flippers instead of legs and a long, fish-like tail. However, they are able to move clumsily on land if necessary.
They hunt sea creatures, swallowing smaller prey whole and relying on their powerful teeth to incapacitate larger creatures. They can threaten shipping as they sometimes assume passing ships are some new type of whale.
A typical specimen is 50 feet long and weighs 30,000 pounds.1
Tylosauruses live in the vast central band of the Okaiyo Ocean along with other huge sea predators. Tylosauruses prowl the surface layers of the ocean and are, as above, a threat to shipping in this ocean.2
- Tylosaurus (extinct real-world animal) on Wikipedia