A 'mat' of Pyura praeputialis in Chile. (IMAGE) University of Southampton Caption A 'mat' of Pyura praeputialis in Chile. Credit Marc Rius Usage Restrictions Credit required 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.