
Fossils of two Jurassic mammaliaforms document the gradual loss of load-bearing function in the articular-quadrate jaw joint, a key prerequisite for the detachment of post-dentary bones and the eventual formation of the mammalian middle ear.


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A new morganucodontan-like species from the Jurassic in China shows evidence of a loss of load-bearing function in the articular–quadrate jaw joint, which probably had a role in the evolution of the mammalian middle ear.

Fossils document evolutionary changes of jaw joint to mammalian middle ear - Nature

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Fossils Reveal Evolutionary Transition of Jaw Joint to Mammalian Middle Ear
