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| Chaetoceros decipiens var. grunowii (Schütt) F.W. Mills 1933 |
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| Chaetoceros mamillosa (Grunow in Cleve & Grunow) F.W. Mills 1933 |
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| Chaetoceros valdivae (Karsten) Mills 1933 |
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| Charcotia apollinis (Ehrenberg) Mills 1933 |
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| Climaconeis linearis Janisch & Rabenhorst according to Mills 1933 |
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| Cocconeis belawani (Meister) F.W. Mills 1933 |
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| Cocconeis fenestratus (Greville) Mills 1933 |
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| Cocconeis gibberula var. angustior (Grunow ex Van Heruck) F.W. Mills 1933 |
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| Cocconeis mammalis (Castracane) F.W. Mills 1933 |
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| Cocconeis nigricans var. denticulata F.W. Mills 1933 |
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| Cocconeis placentula f. minor (Pantocsek) F.W. Mills 1933 |
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| Cocconeis toniana Pantocsek according to Mills 1933 |
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| Cocconema botellum (Lagerstedt) Cleve & Möller Type no. 59 according to Mills 1933 |
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| Cocconema maculata (Kützing) Mills 1933 |
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| Cymbella biceps (Ehrenberg) F.W. Mills 1933 |
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| Goniothecium hispidum var. monicae (Grunow in Van Heurck) F.W. Mills 1933 |
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