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MESOZOIC ERA

TRIASSIC PERIOD

251-201 million years ago

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CYNODONT

Intermediate cynodonts possessed a mix of ancestral and derived features.

In intermediate cynodonts (such as Thrinaxodon) the parietal bone extended into an area of the lateral wall of the braincase which was previously cartilaginous. The pineal foramen between the two parietal bones was lost.