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| Coscinodiscus lewisianus var. similis Rattray 1890 |
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| Coscinodiscus longispinus Grunow in Rattray 1890 |
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| Coscinodiscus luctosus Grove manuscript in Rattray 1890 |
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| Coscinodiscus ludovicianus Rattray 1890 |
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| Coscinodiscus lunatus Grove manuscript in Rattray 1890 |
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| Coscinodiscus lutescens Rattray 1890 |
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| Coscinodiscus luxuriosus Rattray 1890 |
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| Coscinodiscus marginatus var. decussata Rattray 1890 |
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| Coscinodiscus marginatus var. intermedia (intermedius) (Grunow) Rattray 1890 |
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| Coscinodiscus marginulatus Rattray 1890 |
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| Coscinodiscus megacentrum Grove manuscript in Rattray 1890 |
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| Coscinodiscus minor Anglor in Rattray 1890 |
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| Coscinodiscus minuens Rattray 1890 |
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| Coscinodiscus minutellus Rattray 1890 |
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| Coscinodiscus modestus Rattray 1890 |
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| Coscinodiscus moelleri var. macroporus (Grunow) Rattray 1890 |
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| Coscinodiscus monicae (Grunow) Rattray 1890 |
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| Coscinodiscus moronensis (Greville manuscript, Rattray) Rattray 1890 |
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| Coscinodiscus naviculoides (Truan y Luard & Witt) Rattray 1890 |
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| Coscinodiscus nitidulus var. subradians Rattray 1890 |
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