Icelandic Ice Age Amphipod (IMAGE) University of Chicago Press Journals Caption Crymostygius thingvallensis, the only species in a recently described family of groundwater amphipods Crymostygidae. Credit (photograph by Thorkell Heidarsson) Usage Restrictions Credit must be given to Thorkell Heidarsson 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.