Safari Ltd ElasmosaurusSafari Ltd Elasmosaurus Elasmosaurus was a large marine reptile that lived during the Late Cretaceous (about 80 million years ago) in a shallow sea that once covered what is now central North America. It belonged to a group of reptiles called plesiosaurs which are characterized by the possession of a very long neck, small head, turtle shaped body with flippers rather than legs, and a short tail. Safari Ltd Model 302429 Size in cm: 22. 1cm x 2. 67cm x