Anomalocaridid (IMAGE) Yale University Caption The anomalocaridid fossil shows this ancient sea predator existed for much longer and grew to much larger sizes than previously thought. Credit Peter Van Roy Usage Restrictions With credit given. 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.