Cotylorhynchus, a genus of late Permian synapsids. It's herbivorous and it's huge gut was possibly necessary to digest the nutrient-poor plant life it fed on.

fossilesque@mander.xyz · 1 day ago

Cotylorhynchus, a genus of late Permian synapsids. It's herbivorous and it's huge gut was possibly necessary to digest the nutrient-poor plant life it fed on.

umbraroze@lemmy.world · 20 hours ago

I don’t know where this particular fella fits in the history, but turtles evolved from similar quadruped reptiles. Basically, their ribs evolved flat and wide so that their chests could support them better while burrowing tunnels. That turned into the turtle plastron.