Elasmosaurus
Elasmosaurus was a genus of plesiosaur with an extemelly longneck. It lived in the Late Cretaceous.
Kronosaurus
This was a genus of short necked pliosaur that lived in the Early Cretaceous.
This was a a very large genus of pterosaur that lived in the Late Cretaceous in North America.
Stegosaurus lived in western North America and Europe in the Late Jurassic.
