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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 | Bacillariophycidae Mann
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| Order | Cymbellales Mann
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| Family | Cymbellaceae Greville
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| Genus | Placoneis Mersechkowsky |
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Direct Children: |
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| Species |
Placoneis abiskoensis (Hustedt) Lange-Bertalot and Metzeltin in Metzeltin and Witkowski
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| Species |
Placoneis amphibola (Cleve) E.J. Cox
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| Species |
Placoneis anglica (Ralfs in Pritchard) E.J. Cox
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| Species |
Placoneis anglophila (Lange-Bertalot) Lange-Bertalot in Metzeltin, Lange-Bertalot and García-Rodríguez
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| Species |
Placoneis balcanica (Hustedt) Lange-Bertalot, Metzeltin and Levkov
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| Species |
Placoneis clementioides (Hustedt) E.J. Cox
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| Species |
Placoneis clementis (Grunow) E.J. Cox
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| Species |
Placoneis constans (Hustedt) E.J. Cox
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| Species |
Placoneis conveniens (Hustedt) Metzeltin and Lange-Bertalot
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| Species |
Placoneis dicephala (W. Sm.) Mersechkowsky
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| Species |
Placoneis elginensis (W. Greg.) E.J. Cox
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| Species |
Placoneis exigua (W. Greg.) Mersechkowsky
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| Species |
Placoneis exiguiformis (Hustedt) Lange-Bertalot in Metzeltin, Lange-Bertalot and García-Rodríguez
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| Species |
Placoneis exiguioides (Hustedt) Lange-Bertalot in Metzeltin, Lange-Bertalot and García-Rodríguez
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| Species |
Placoneis explanata (Hustedt) Mayama in Mayama and Kawashima
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| Species |
Placoneis gastriformis (Hustedt) Lange-Bertalot in Metzeltin, Lange-Bertalot and García-Rodríguez
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| Species |
Placoneis gastrum (Ehrenb.) Mersechkowsky
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| Species |
Placoneis hambergii (Hustedt) K. Bruder in Bruder and Medlin
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| Species |
Placoneis insignita (Hustedt) E.J. Cox
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| Species |
Placoneis interglacialis (Hustedt) E.J. Cox
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| Species |
Placoneis neglecta (Krasske) Lowe
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| Species |
Placoneis placentula (Ehrenb.) Heinzerl.
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| Species |
Placoneis pseudanglica (Cleve-Euler) E.J. Cox
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| Species |
Placoneis pseudoclementis (Hustedt) Lange-Bertalot in Metzeltin, Lange-Bertalot and García-Rodríguez
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| Species |
Placoneis rostrata (A. Mayer) E.J. Cox
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| Species |
Placoneis signata (Hustedt in Schmidt et al.) Mayama in Mayama and Kawashima
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| Species |
Placoneis sovereignae (Hustedt) Torgan and Donadel
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| Species |
Placoneis subclementis (Hustedt) Lange-Bertalot in Metzeltin, Lange-Bertalot and García-Rodríguez
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| Species |
Placoneis subgastriformis (Hustedt) E.J. Cox
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| Species |
Placoneis subplacentula (Hustedt) E.J. Cox
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