Dimetrodon (name meaning "Two Measured of Teeth") is a genus of synapsids that originated during the Early Permian era in what is now North America and Europe. A carnivorous, non-therapsid mammal-like reptile and arguably the apex predator of its time, its recognizable feature is the large fin-like sail on its back.
Thought to have been extinct for 245 million years, there are still some that remain alive on Primeval Island.
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