Mussel (1 of 2) (IMAGE) Penn State Caption The Elliptio complanate freshwater mussel, one of the two species used in the experiment. Credit Westcott Phillip 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.