Demosponge (IMAGE) University of California - Riverside Caption An underwater picture of the modern demosponge species Rhabdastrella globostellata, which make the same 26-mes steroids that the researchers found in ancient rocks. Credit Paco Cárdenas 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.