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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 | Fragilariophycidae Round
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| Order | Fragilariales Silva
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| Family | Fragilariaceae Greville
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| Genus | Synedra Ehrenberg
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| Species | Synedra ulna (Nitzsch) Ehrenb. |
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Direct Children: |
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| Variety | Synedra ulna var. aequalis (Kütz.) Hust.
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| Variety | Synedra ulna var. amphirhynchus (Ehrenb.) Grunow
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| Variety | Synedra ulna var. biceps (Kütz.) Kirchn.
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| Variety | Synedra ulna var. chaseana B. W. Thomas
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| Variety | Synedra ulna var. claviceps Hust.
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| Variety | Synedra ulna var. constricta Venkt.
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| Variety | Synedra ulna var. contracta Østrup
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| Variety | Synedra ulna var. danica (Kütz.) Van Heurck
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| Variety | Synedra ulna var. impressa Hust.
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| Variety | Synedra ulna var. lanceolata Grun.
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| Variety | Synedra ulna var. longissima (W. Sm.) Brun
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| Variety | Synedra ulna var. obtusa (W. Sm.) Grunow
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| Variety | Synedra ulna var. oxyrhynchus (Kütz.) Van Heurck
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| Variety | Synedra ulna var. ramesi (Herib.) Hustedt
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| Variety | Synedra ulna var. spathulifera (Grunow) Van Heurck
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| Variety | Synedra ulna var. subaequalis (Grunow) Van Heurck
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| Variety | Synedra ulna var. ulna (Nitzsch) Ehrenb.
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