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Sphenacodon (meaning "wedge point tooth") is an extinct genus of synapsid that lived in the USA during the Late Carboniferous period and Early Permian period around 300-280 million years ago. It is a close relative to the more well known Dimetrodon.
See Sphenacodon/JW: TG Sphenacodon appeared in Jurassic World: The Game.