Fig 2 (IMAGE) University of Bristol Caption Diversities of brachiopods and bivalves over the past 500 Myr, showing the brachiopod-bivalve switch near the Permian-Triassic boundary. Credit Zhen Guo et al 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.