Actinopterygian Fossils (IMAGE) University of Bristol Caption Actinopterygian fossils show a wide range of body shapes which change through time. These changes can be studied to better understand the group's evolution. Credit Fiann Smithwick, University of Bristol Usage Restrictions None 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.