were a family of marine reptiles
from the Jurassic
periods. Widespread, they were most succesful around Europe
Like most marine reptiles, most plesiosaurs beached themselves in order to give birth.
List of plesiosaursEdit
Regular, long-necked plesiosaurs included the Jurassic Cryptoclidus, and the Cretaceous Elasmosaurus.
Pliosaurs were similar to regular plesiosaurs, but had massive heads and short necks - they were also voracious predators. The pliosaurs included Liopleurodon and an unidentified species.