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Epistylididae
Family, Protozoan, Freshwater
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Euplotidae
Family, Protozoan, Freshwater, marine
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Ophrydiidae
Family, Protozoan, Freshwater, terrestrial
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Spirofilidae
Family, Protozoan, Freshwater, marine
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Vaginicolidae
Family, Protozoan, Freshwater, marine
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