Hermit Crab Shells (IMAGE) BMC (BioMed Central) Caption The two co-occurring hermit crab species and the four most commonly utilized gastropod shell types. Credit Christian Laforsch, University of Bayreuth Usage Restrictions Images may be used when appropriate credit is given. 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.