Image 1 (IMAGE) University of Bristol Caption Side and oral views of a virtual model of the ischnacanthid acanthodian jaw showing the tooth-rows and reconstruction of the tooth replacement. Credit Martin Rücklin, Naturalis Biodiversity Center Usage Restrictions With release 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.