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Meet Placerias hesternus, a large Late Triassic dicynodont from North America

I did this illustration for my book of the tetrapods of the Triassic (still in preparation). You can see other two illustrations of dicynodonts I did for my book on my Patreon https://www.patreon.com/serpenillus

Artwork and text: Gabriel Ugueto

#nature #art #animals #illustration #paleoart #paleoillustration #prehistoric #dicynodont #placerias

Results from the #paleostream

Diplocaulus minimus, Shikamaia (giant Permian bivalve), Placerias (male and female) and Acanthodes

#paleoart #sciart #paleostream #palaeoblr #dinosaur #triassic #fish #dicynodont #placerias #bivalve #diplocaulus

Assorted critters

#arthropleura #majungasaurus #rapetosaurus #simosuchus #alamosaurus #lystrosaurus #placerias #paleoart #digital drawing #digital doodle #digital doodles

and the end of Perspectives Triassic! This is a part of my Perspectives series, check out #perspectives on my blog for more!

"Placerias Problem" Placerias/Desmatosuchus Triassic, 220 million years ago, Chinle Formation During the Triassic, the continents were all one - this was, of course, the landmass Pangea. The presence of such a massive supercontinent produced an extreme weather effect known as the Pangean megamonsoon - a seasonal wind reversal taking the coasts from arid and dry to incredibly rainy. This is also the cause of the stampede we see here. Placerias was one of the latest-surviving dicynodonts. Having made it straight through the Great Dying, they'd experience a rediversification during the Triassic before dying out by the Jurassic's beginning. Not only did it have actual tusks on the inside of its mouth - it also had two "false" tusks on its beak - known as maxillary caniniforms! These were sexually dimorphic - longer in males and shorter in females.

Desmatosuchus was an aetosaur - a crocodile relative that died off after the Triassic as well. An armored back and spikes on its sides would have made for an effective defense against any predator, and it likely rooted around for plants and invertebrates in the muddy ground where it lived. Although its low profile might be effective in a predation scenario, however....this is no predation scenario.

#yee art #perspectives #palaeoblr #paleoblr #paleoart #paleontology #triassic #mesozoic #reptile #herpetology #nature art #pangea #storm #placerias #synapsid #desmatosuchus #aetosaur

"A herd of the North American dicynodonts, Placerias, scatter from a water hole as a rauisuchian, Postosuchus, threatens their safety. Placerias reached lengths of approximately 2.5 m (8 ft), and Postosuchus was some 4 m (13 ft) long."

From Dinosaurs: A Global View (1990) by Sylvia J. Czerkas & Stephen A. Czerkas. Illustrated by Douglas Henderson, Mark Hallett, John Sibbick.

#postosuchus #placerias #dicynodont #dicynodonts #rauisuchian #rauisuchians #paleoart #paleontology