Quadrate bone

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What Wikipedia says

The quadrate bone is a skull bone in most tetrapods, including amphibians, sauropsids (reptiles, birds), and early synapsids, as well as in many actinopterygian and actinistian fish. The quadrate bone forms the lower jaw articulation in all vertebrates except mammals.

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

Image: Preto(m), CC BY-SA 3.0, via Wikimedia Commons.