Elasmosaurus
Elasmosaurus was a prehistoric reptile of the order Plesiosauria that lived at the end of the Cretaceous period in what corresponds to the current North America. This reptile, like the other plesiosaurs, lived in marine habitat. Elasmosaurus was about 14 meters long, most of which corresponded to the very long neck, which reached about 8 meters. The neck was composed of 70 vertebrae and ended in a tiny head of about 60 cm. From the dentition it is deduced that the elasmosaurus was carnivorous and fed on small fish and other animals. The earliest fossils of elasmosaurus were discovered in 1868 by Edward Drinker Cope. In addition to E. platyurus, there are seven more species described within the genus Elasmosaurus.