The oldest plesiosaur was a robust swimmer

Plesiosaurs have been particularly efficient swimmer. These lengthy extinct ‘paddle saurians’ propelled themselves by way of the World’s oceans by using ‘underwater flight’ — just like sea turtles and penguins. The discover comes from the youngest a part of the Triassic interval and is about 201 million years previous.
Paleontology News — ScienceDaily

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