<i>Dimetrodon</i> by Danielle Dufault (IMAGE) University of Toronto Caption This is an artist impression of a Dimetrodon. Credit Danielle Dufault Usage Restrictions Please credit artist License Licensed content 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.