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Triceratiaceae
Family, Diatom, Marine
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Thalassiosiraceae
Family, Diatom, Marine
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Thalassionemataceae
Family, Diatom, Marine
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Tabellariaceae
Family, Diatom, Marine, terrestrial
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Surirellaceae
Family, Diatom, Marine, terrestrial
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Striatellaceae
Family, Diatom, Marine
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Stephanopyxidaceae
Family, Diatom, Marine
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Stephanodiscaceae
Family, Diatom, Marine, terrestrial
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Skeletonemaceae
Family, Diatom, Marine
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Scoliotropidaceae
Family, Diatom, Marine