Sphenacodontia

Rarity: Common

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At a glance

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What Wikipedia says

Sphenacodontia is a stem-based clade of derived synapsids. It was defined by Amson and Laurin (2011) as "the largest clade that includes Haptodus baylei, Haptodus garnettensis and Sphenacodon ferox, but not Edaphosaurus pogonias". They first appear during the Late Pennsylvanian (Upper Carboniferous) epoch.

Excerpt from the Wikipedia article “Sphenacodontia”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Smokeybjb, CC BY-SA 3.0, via Wikimedia Commons.