<I>Echinometra viridis</I> (IMAGE) Smithsonian Tropical Research Institute Caption Echinometra viridis. Credit J. Ruvalcaba, STRI Usage Restrictions Credit: STRI 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.