Phylum Arthropoda Subphylum Crustacea Class Branchiopoda Order Cladocera Number of families 15
Small transparent zooplankton found in bodies of freshwater throughout the world; a few species inhabit marine waters
Photo: Photomicrograph of a gravid female water flea (Daphnia magna) carrying eggs. (Photo by Holt Studios/Nigel Cattlin/Photo Researchers, Inc. Reproduced by permission.)
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