<em>Crepidula marginalis</em> (IMAGE) Smithsonian Tropical Research Institute Caption Contact, rather than chemical signals released into the water, induces sex change in slipper snails, Crepidula marginalis, shown here in their natural, intertidal habitat. Credit Rachel Collin, STRI Usage Restrictions credit STRI 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.