Rhabdopleura compacta (image) University at Buffalo Caption This is a Rhabdopleura compacta zooid. A new study identifies rhabdopleurids as an ancestor of more elaborate species that have since died off. Credit Dr. Atsuko Sato, University of Oxford Usage Restrictions This image may only be used in connection with stories about the research outlined in the news release. 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.