Placerias: Giant Triassic Herbivore

The extinct, one-ton herbivore Placerias was a distant relative of mammals. It lived during the Late Triassic, a stage of the Mesozoic Era when Synapsida, the stem-mammals, were in decline but before only tiny mammals remained. Placerias belonged to Dicynodontia, a once highly successful clade of synapsids who are famous for their beaks and long tusks, although the role of Placerias's tusk had been almost entirely subsumed by an extension of its maxilla. Placerias was once thought tp have been the last dicynodont, but other, younger species have been found in recent years.

Thank you to the themattalorian for narrating this video.



Sources:

https://repository.si.edu/handle/1008...

https://www.researchgate.net/profile/...

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00:00 - Introduction
00:56 - Anatomy
03:13 - Discovery
04:49 - Sexual Dimorphism
06:33 - Lifestyle
08:01 - The Last Dicynodont?
12:48 - Outro