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PALEOZOIC ERA

PERMIAN PERIOD

299-252 million years ago

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jaw

In the lower jaw, therapsids possessed a reflected angular, a coronoid process, and their jaw joint was located more anteriorly. Therapsids reduced the number postcanine teeth and the canine teeth became further enlarged. There was a reduction in the number of incisors to 5 upper and 4 lower incisors in therapsids. The postcanine teeth increased their complexity.