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Parameciidae
Family, Protozoan
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Oxytrichidae
Family, Protozoan
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Oxytoxaceae
Family, Protozoan, Marine
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Oxyrrhinaceae
Family, Protozoan, Marine
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Ostreopsidaceae
Family, Protozoan, Marine
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Ophrydiidae
Family, Protozoan, Freshwater, terrestrial
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Noctilucaceae
Family, Protozoan, Marine
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Mesodiniidae
Family, Protozoan, Marine, terrestrial
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Lophodiniaceae
Family, Protozoan, Marine
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Litonotidae
Family, Protozoan