Fig 1 (IMAGE) University of Bristol Caption Left, Devonian brachiopod fossils from Ohio, USA. Right, recent bivalve shells from shell beach, western Australia. Credit (Wikimedia Commons; Creative Commons CC0 1.0 Universal Public Domain Dedication) for image on the left. Image on right by Zhong-Qiang Chen. Usage Restrictions Once with release 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.