Meet the Dimetrodon (Dimetrodon angelensis), a large synapsid (NOT A DINO) of the sphenacodontidae family. Model based on a recent study on the sail (credit: Christian Kammerer). Colors based on Rebecca Groom's illustration

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Sphenacodon was medium-large carnivorous synapsid named in the late 19th century. It lends its generic name to the family to which it belongs; the Sphenacodontidae, which the famous Dimetrodon is also a part of. Sphenacodon lasted from the Late Carboniferous to the Early Permian.

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