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Hydra and Daphnia

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Hydra is a minute predaceous carnivore in the Phylum Cnidaria (along with jellyfish, sea-anemones and corals). They paralyze their prey with a harpoon-like stinging apparatus called a cnidocyte. Daphnia (sometimes called a “water flea“) is a planktonic crustacean. Although both animals are common in freshwater ecosystems locally, these were purchased from a biological supply company and photographed in a small aquarium in Ohio, USA, on February 17, 2011.

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