Xerocrassa montserratensis (image) University of Barcelona Share Print E-Mail Caption This mollusc is considered to be an excellent model in phylogeographical studies. Credit Vicenç Bros Usage Restrictions The image may only be used with appropriate caption or credit. Share Print E-Mail 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.