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| Coscinodiscus rothii var. grandiuscula Rattray 1890 |
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| Coscinodiscus rothii var. singaporensis Rattray 1890 |
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| Coscinodiscus sphaeroidalis Rattray 1890 |
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| Coscinodiscus sphaeroidalis var. cincta Rattray 1890 |
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| Coscinodiscus spinuligerus (Grunow) Rattray 1890 |
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| Coscinodiscus splendidulus Rattray 1890 |
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| Coscinodiscus subareolatus Rattray 1890 |
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| Coscinodiscus subaulacodiscoidalis Rattray 1890 |
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| Coscinodiscus subconcavus var. tenuior Rattray 1890 |
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| Coscinodiscus suberbus Hardman manuscript, Rattray 1890 |
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| Coscinodiscus suberbus var. moravica (Grunow in Pantocsek) Rattray 1890 |
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| Coscinodiscus sublineatus (Grunow) Rattray 1890 |
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| Coscinodiscus subnitidus Rattray 1890 |
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| Coscinodiscus subnotabilis var. marina Rattray 1890 |
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| Coscinodiscus subnotabilis (subnotalilis) Rattray 1890 |
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| Coscinodiscus suboculatus Rattray 1890 |
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| Coscinodiscus subtilis O'Meara in litt. in Rattray 1890 |
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| Coscinodiscus subtilis var. lineolata Rattray 1890 |
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| Coscinodiscus subtilis var. scabra Rattray 1890 |
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| Coscinodiscus superbus Hardman manuscript in Rattray 1890 |
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