Image 2 (IMAGE) University of Bristol Caption Virtual section through the ischnacanthid acanthodian jaw showing growth lines and the addition of teeth used to reconstruct the tooth replacement. Credit Martin Rücklin, Naturalis Biodiversity Center Usage Restrictions with releases 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.