Themisto Libellula (IMAGE) Cell Press Caption This is a photo of Themisto libellula, an amphipod crustacean and a predatory hunter of copepods such as Calanus -- a probable werewolf of the Arctic. Credit Daniel Vogedes (The Arctic University of Norway, UiT). Usage Restrictions Credit Required. 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.