Animal Profiles
Reptiles

Mosasaurus

Mosasaurus

Extinct

This animal is extinct. No living individuals remain.

Status source

Mosasaurus was a large marine reptile of the Late Cretaceous. It belonged to the squamate branch of reptiles and shared ancestry with lizards and snakes rather than being a marine dinosaur.

Mosasaurus, AI-generated lifelike reconstruction
AI-generated reconstruction. Colors and soft tissues are interpretive.

At a glance

Habitat
Open ocean
Diet
Carnivore
Food
Marine animal prey.

Classification

Common name
Mosasaurus
Browse group
Reptiles
Scientific name or taxon
Mosasaurus
Source classification
Reptilia

Three things to know

  • It was related to lizards and snakes.
  • Teeth also occurred on the roof of the mouth.
  • Body-size estimates depend on incomplete fossils.

Habitat and range

The first recognised Mosasaurus fossils came from the Netherlands. The genus belongs within the wider mosasaur group, whose marine fossils occur across the world; those broader records are not all assigned to Mosasaurus here.

Appearance and adaptations

Powerful jaws, pointed teeth and paddle-like limbs suited an aquatic predator. Teeth on the roof of the mouth helped hold prey. Reconstructions of body size and tail shape draw partly on related mosasaurs.

Diet and behaviour

Mosasaurus fed on marine animals. Mosasaurs more broadly included species with different prey specialisations, so their diets should not be treated as identical. Fossils support a fully aquatic life, although detailed behaviour remains uncertain.

Sources

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