Learn about Mosasaurus , a powerful marine reptile that ruled the ancient oceans. Discover its physical features, diet, behavior, and how it evolved from ancient lizards. Mosasaurus is a genus of mosasaurs, carnivorous aquatic lizards. It existed during the Maastrichtian age of the late Cretaceous period, between about 70 and 66 million years ago, in western Europe and North America. Explore the fascinating world of the Mosasaurus with this comprehensive guide filled with illustrations, facts, and more from the late Cretaceous period. Mosasaurus was an aquatic carnivore that preyed on fish, marine reptiles, birds, pterosaurs, smaller mosasaurs, and possibly even land dinosaurs. Mosasaurus teeth were formed like sharp spikes, letting it grab and hold onto its prey. The Mosasaurus 's double-hinged mouth would allow it to devour its prey entirely.
