Thalassomedon is a plesiosaur from Cretaceous period.  They lived in the Western Interior Sea at its earliest stage.  It hunted fish by attacking it from under neath.  It was a graceful swimmer and top predator.  It is related to a latter species called Elasmosaurus.

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.