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| Kingdom | Chromista
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| Subkingdom | Harosa
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| Infrakingdom | Halvaria
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| Superdivision | Heterokonta
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| Division | Ochrophyta
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| Class | Bacillariophyceae Haeckel
– diatoms, diatomées |
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| Subclass | Coscinodiscophycidae Round and Crawford
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| Order | Thalassiosirales Glezer and Makarova
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| Family | Stephanodiscaceae Glezer and Makarova
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| Genus | Cyclostephanos Round ex Round in Theriot, Hakannson, Kociolek, Round and Stoermer |
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Direct Children: |
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| Species | Cyclostephanos costatilimbus (Kob. & Kob.) Stoermer, Håk. & Theriot.
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| Species | Cyclostephanos dubius (Fricke) Round in Theriot, Håkansson, Kociolek, Round & Stoermer
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| Species | Cyclostephanos invisitatus (M. H. Hohn & Hellerm.) Theriot, Stoermer & Håk.
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| Species | Cyclostephanos tholiformis Stoermer, Håk. & Theriot
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