Daphnia pulex with Embryos (image) Marine Biological Laboratory Share Print E-Mail Caption The freshwater zooplankton Daphnia pulex (water flea) with a brood of genetically identical future offspring. Credit Paul D.N. Hebert, University of Guelph 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.