Artist's Rendering of the Pareiasaur Bunostegos (image) Society of Vertebrate Paleontology Share Print E-Mail Caption Artist's rendering of the pareiasaur Bunostegos, a cow-sized, plant-eating reptile that roamed the ancient central desert of Pangea over 250 million years ago. Credit Illustration by Marc Boulay. Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.