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| Coscinodiscus aethes Rattray 1890 |
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| Coscinodiscus africanus var. wallichianus Grunow in Rattray 1890 |
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| Coscinodiscus agapetos Rattray 1890 |
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| Coscinodiscus antediluvianus Rattray 1890 |
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| Coscinodiscus antimimos Rattray 1890 |
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| Coscinodiscus apages Rattray 1890 |
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| Coscinodiscus aphrastos Rattray 1890 |
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| Coscinodiscus apiculatus var. woodwardii (Eulenstein in A. Schmidt) Rattray 1890 |
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| Coscinodiscus apiculiferus Rattray 1890 |
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| Coscinodiscus apollinis var. compacta Rattray 1890 |
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| Coscinodiscus argus var. subtraducens Rattray 1890 |
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| Coscinodiscus atlanticus var. striatula Rattray 1890 |
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| Coscinodiscus baileyi (H.L. Smith) Rattray 1890 |
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| Coscinodiscus balticus Grunow in Rattray 1890 |
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| Coscinodiscus bathyomphalus var. wankaremensis Rattray 1890 |
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| Coscinodiscus bipartitus Rattray 1890 |
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| Coscinodiscus bisculptus Rattray 1890 |
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| Coscinodiscus californicus O'Meara manuscript in Rattray 1890 |
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| Coscinodiscus cocconeiformis var. brevior Rattray 1890 |
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| Coscinodiscus cocconeiformis var. latior Rattray 1890 |
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