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| Coscinodiscus nitidus var. minor Rattray 1890 |
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| Coscinodiscus nitidus var. moronensis Grunow manuscript in Rattray 1890 |
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| Coscinodiscus nitidus var. sparsa Rattray 1890 |
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| Coscinodiscus nitidus var. tenuis Rattray 1890 |
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| Coscinodiscus nodulifer var. apiculata Rattray 1890 |
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| Coscinodiscus notabilis Rattray 1890 |
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| Coscinodiscus obliquus (Greville manuscript, Rattray) Rattray 1890 |
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| Coscinodiscus obnubilus Rattray 1890 |
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| Coscinodiscus obovatus var. circularis Rattray 1890 |
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| Coscinodiscus obscurus var. minor Rattray 1890 |
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| Coscinodiscus obversus Rattray 1890 |
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| Coscinodiscus obversus var. tenuior Rattray 1890 |
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| Coscinodiscus oculusiridis var. loculifera Rattray 1890 |
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| Coscinodiscus oculusiridis var. stelliger Rattray 1890 |
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| Coscinodiscus odontodiscus var. parvatenuistriata Rattray 1890 |
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| Coscinodiscus odontodiscus var. subsubtilis Rattray 1890 |
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| Coscinodiscus ovalis (Greville) Rattray 1890 |
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| Coscinodiscus pacificus (Grunow) Rattray 1890 |
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| Coscinodiscus paleaceus (Grunow in Van Heurck) Rattray 1890 |
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| Coscinodiscus partitus Grove & Sturt manuscript in Rattray 1890 |
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