Endolithic Sponges (IMAGE) University of Exeter Caption Endolithic sponges are important substrate eroders. This image shows a massive coral infested by an endolithic sponge which is denuding the colony and destroying the living tissue. Credit University of Exeter 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.