Dimetrodon grandis (IMAGE) University of Queensland Caption An artist's impression of the likely-endothermic Dimetrodon grandis, an early synapsid that was around for about 20 million years from the early Permian, 295 million years ago. Credit Max Bellomio Usage Restrictions Credit must be given to the creator. Adaptations must be shared under the same terms. License CC BY-SA 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.