Research summary
Classification used here: Large marine squamate reptile. Fossils assigned to Mosasaurus are known from Late Cretaceous (about 82 million to 66 million years ago) and have been found in Europe, North America, Other Late Cretaceous seas. The museum uses 10–14 m (about 33–46 ft) as the reference body length and describes the diet as meat-eater. Mosasaurus was not a dinosaur. It was a fully aquatic squamate reptile, on the branch of the family tree that also includes today's lizards and snakes. Its flippers helped it steer, while its tail provided most of the thrust. Soft-tissue evidence from other well-preserved mosasaurs supports a tail tip with an asymmetrical, two-lobed outline.
Fossil evidence and reconstruction limits
- The model title is not detailed enough to identify a species, so the label deliberately avoids a species-level claim.
- The 10–14 metre figure is an approximate display range for large mosasaurs; length estimates vary with the specimen and method.
- The tail-fin soft tissue, colour, open-mouth pose and swimming movement were manually checked for this display, but they remain cautious reconstructions informed partly by close relatives.
Scientific sources
Leon Made This compiled these research notes from public museum resources and scientific papers while preserving uncertainty in the reconstruction. Last reviewed 2026-08-07.
