in the Mesozoic.

Description

Earlier gorgonopsids in the Middle Permian were quite small, with skull lengths of 10-15 cm 0 , whereas some later genera attained massive, bear-like sizes with the largest being Inostrancevia up to 3.5 m in length and 300 kg in body mass. Nonetheless, small gorgonopsians remained abundant until extinction (though small species may actually represent juvenile specimens of other taxa).

Like other Permian therapsids, gorgonopsians

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