Daphnia pulex (image) Marine Biological Laboratory Share Print E-Mail Caption The freshwater zooplankton Daphnia pulex (water flea), a near-microscopic crustacean that lives in ponds and lakes, has a translucent body and a compound eye. Credit Jan Michels, Christian-Albrechts-Universitaet zu Kiel Usage Restrictions Please use with proper credit. 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.