| WebNameShort | |
| Campylodiscus ehrenbergii Ralfs in Pritchard 1861 |
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| Campylodiscus elegans (Ehrenberg) Ralfs in Pritchard 1861 |
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| Campylodiscus flexuosa (Ehrenberg) Ralfs in Pritchard 1861 |
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| Campylodiscus myodon (Ehrenberg) Ralfs in Pritchard 1861 |
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| Campylodiscus normanicus 'Greville' Ralfs in Pritchard 1861 |
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| Campylodiscus ovatus Ralfs in Pritchard 1861 |
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| Cerataulus laevis (Ehrenberg) Ralfs in Pritchard 1861 |
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| Cerataulus smithii Ralfs in Pritchard 1861 |
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| Cerataulus thermalis (Meneghini) Ralfs in Pritchard 1861 |
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| Ceratoneis acicularis (Kützing) Ralfs in Pritchard 1861 |
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| Ceratoneis linea (Ehrenberg) Ralfs in Pritchard 1861 |
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| Ceratoneis reversa (W. Smith) Ralfs in Pritchard 1861 |
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| Ceratoneis rhomboides Ehrenberg in Ralfs in Pritchard 1861 |
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| Chaetoceros confervoides Ralfs in Pritchard 1861 |
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| Cocconeis brasiliensis Ehrenberg in Ralfs in Pritchard 1861 |
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| Cocconeis turgida Ehrenberg in Ralfs in Pritchard 1861 |
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| Coscinodiscus cervinus (Brightwell) Ralfs in Pritchard 1861 |
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| Coscinodiscus excavatus Greville manuscript, Ralfs in Pritchard 1861 |
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| Craspedodiscus barbadensis Ralfs in Pritchard 1861 |
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| Cyclotella atlantica (Ehrenberg) Ralfs in Pritchard 1861 |
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