Cardiocorax mukulu (IMAGE) Southern Methodist University Caption Elasmosaurids, like the Cardiomorax mukulu reptiles seen here, lived during the Cretaceous Period. They were predators, thriving on fish and other marine life. Credit Karen Carr Studio Inc. Usage Restrictions No restrictions, as long as the following credits are cited. Thanks! License Original 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.