Sea Urchin (IMAGE) University of Southern California Caption This is a fully grown Strongylocentrotus purpuratus sea urchin, the species tested in the study. Credit Photo/Taollan Usage Restrictions For use in news stories only. 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.