Archelon (name meaning "Ruling Turtle") is a genus of giant prehistoric marine turtle that originated during the Late Cretaceous period in what is now North America. Measuring almost 5 meters long and weighing over 2 tons, Archelon was the largest turtle that ever existed.
In the Series 2 finale "Death of a Dynasty: To Hell... And Back", A single female Archelon was brought to the park from Late Cretaceous Montana, 65 million years ago. She resides in the Primeval Aquarium Enclosure with a male that followed the team through the portal.
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Archelon skeleton