Thrinaxodon (image) Field Museum Share Print E-Mail Caption This is Thrinaxodon, a therapsid animal related to today's mammals. The therapsids are the group where mammal relatives began developing diverse forelimbs. Credit (c) April I. Neander Usage Restrictions Please use credit (c) April I. Neander 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.