Themisto Libellula (image) Cell Press Share Print E-Mail 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. 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.