Eothyrididae

Rarity: Common

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What Wikipedia says

Eothyrididae is an extinct family of very primitive, insectivorous synapsids. Only three genera are known, Eothyris, Vaughnictis and Oedaleops, all from the early Permian of North America. Their main distinguishing feature is the large caniniform tooth in front of the maxilla.

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

Image: Nobu Tamura (http://spinops.blogspot.com), CC BY 2.5, via Wikimedia Commons.