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When Did Therapsids Go Extinct?

Marcus Vance • • 6 min read
When Did Therapsids Go Extinct?

The last of the non-mammalian therapsids, the haramiyidan cynodonts

cynodonts
Synapsids were the largest terrestrial vertebrates in the Permian period, 299 to 251 million years ago, equaled only by some large pareiasaurs at the end of the Permian. ... The cynodont group Probainognathia, which includes Mammaliaformes, were the only synapsids to survive beyond the Triassic.
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, became extinct in the Late Cretaceous, approximately 66 million years ago, though they may have become extinct later if Gondwanatheria are haramiyidans, as has been suggested.

When did Pelycosaurs go extinct?

Dimetrodon, an extinct relative of primitive mammals, lived from about 286 million to 270 million years ago, during the Permian Period, in the section of Pangea that would eventually split off to become North America.

When did therapsids exist?

Therapsid, any member of a major order (Therapsida) of reptiles of Permian and Triassic time (from 299 million to 200 million years ago). Therapsids were the stock that gave rise to mammals.

Marcus Vance
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Marcus Vance

Marcus Vance is a cybersecurity auditor and technology writer dedicated to educating the public about online safety, data privacy regulations, enterprise security, and emerging cyber threats.