Red Sea Urchin (IMAGE) MDI Biological Laboratory Caption The red sea urchin, Mesocentrotus franciscanus, is one of the world's longest-lived organisms Credit MDI Biological Laboratory Usage Restrictions None 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.