Phylum Arthropoda Subphylum Crustacea Class Branchiopoda Order Cladocera Number of families 15

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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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