Sea Urchin Tooth Tips (IMAGE) Cell Press Caption This image shows five sea urchin tooth tips stacked atop one another within the jaws. Credit Horacio Espinosa Usage Restrictions Credit Required. 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.