Study Samples (IMAGE) University of Plymouth Caption These are the four crustacean amphipod species which were the subject of the study -- Paraceradocus miersi, Shraderia gracilis, Probulisca ovata and Prostebbingia brevicornis. Credit John Spicer 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.