What is the name of the marine reptile in the Jurassic World lagoon?

The marine reptile in the Jurassic World lagoon is the Mosasaurus. Although often called a dinosaur by movie audiences, Mosasaurus was actually a giant marine squamate—a relative of modern monitor lizards and snakes. It lived during the Late Cretaceous, roughly 82 to 66 million years ago, and was one of the dominant predators of ancient oceans.

Jurassic World presents it as a spectacular feeding-show attraction. Visitors watch from an arena as the animal launches out of the lagoon to seize a suspended great white shark. The film’s version is heavily enlarged for dramatic effect, but the real animal was also an enormous predator with powerful jaws, conical teeth, and a long, streamlined body propelled by its tail.

A common mix-up is confusing Mosasaurus with plesiosaurs, ichthyosaurs, or pliosaurs. Those were different groups of marine reptiles, while Mosasaurus belonged to the lizard-related mosasaur family. The genus name means “lizard of the Meuse River,” referring to fossils first recognized near Maastricht in the Netherlands.