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water flea, cyclops | minute free-swimming freshwater copepod having a large median eye and pear-shaped body and long antennae used in swimming; important in some food chains and as intermediate hosts of parasitic worms that affect man e.g. Guinea worms | ||
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daphnia, water flea | minute freshwater crustacean having a round body enclosed in a transparent shell; moves about like a flea by means of hairy branched antennae |