Elasmosaurus (/ɪˌlæzməˈsɔːrəs, -moʊ-/;) is a genus of plesiosaur that lived in North America during the Campanian stage of the Late Cretaceous period, about 80.5 million years ago.

Where have Elasmosaurus fossils been found?

The animal would have weighed as much as 15 tons, and it is now one of the most complete ancient reptile fossils ever discovered in Antarctica. Elasmosaurs make up a family of the plesiosaurs, which represent some of the largest sea creatures of the Cretaceous.

Did the Elasmosaurus live in water?

Like Other Marine Reptiles, Elasmosaurus Had to Breathe Air

One thing people often forget about Elasmosaurus, and other marine reptiles, is that these creatures had to surface occasionally for air. They weren't equipped with gills, like fish and sharks, and couldn't live below water 24 hours a day.