Sea Urchin (IMAGE) Wildlife Conservation Society Caption Sea urchins such as Diadema setosum can inhibit coral reef growth in the absence of predators such as orange-lined triggerfish. Credit T. McClanahan/WCS. Usage Restrictions One-time usage 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.