<i>Tethya wilhelma</i> (IMAGE) Friedrich-Schiller-Universitaet Jena Caption The sponge "Tethya wilhelma" has meanwhile become a model organism for evolutionary questions as well as an important subject of investigation within the current study of PD Dr. Michael Nickel from Jena University. Credit Photo: Michael Nickel/FSU Jena 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.