Coronoid bone
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The coronoid is a bone present in the mandible of many non-mammalian vertebrates. It typically lies on the medial wall of each hemimandible, caudal to the tooth row. Among its functions, it provides a lever arm for the attachment of jaw muscles.
In early synapsids, the bone was present; it was progressively reduced during the evolution of mammals, and is absent in modern mammals. Its function has been taken over by the coronoid process of the dentary.
In some animals, including some salamanders and parareptiles, the coronoid bears teeth.
In the parareptile Delorhynchus, multiple coronoid ossifications are present on each side.