Spines at the Edge of the Animal (IMAGE) University of Leicester Caption This image shows part of the margin of Nidelric pugio, showing the individual spines each a few mm long. Credit © Prof Derek J Siveter of Oxford University Usage Restrictions Use only with credit. 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.