Roaming Urchin (IMAGE) University of Southampton Caption The urchin, Centrostephanus rodgersii, has moved into the waters of Tasmania, forming extensive rock barrens, leading to large-scale community change. Credit Credit Rick Stuart-Smith Usage Restrictions Credit Rick Stuart-Smith 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.