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| Coscinodiscus hungaricus var. szaboi (Pantocsek) Rattray 1890 |
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| Coscinodiscus imperator Janisch manuscript in Rattray 1890 |
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| Coscinodiscus implicatus Rattray 1890 |
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| Coscinodiscus implicatus var. picturata (picturatus) Rattray 1890 |
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| Coscinodiscus impolitus Rattray 1890 |
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| Coscinodiscus inaequisculptus Rattray 1890 |
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| Coscinodiscus inclusus Rattray 1890 |
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| Coscinodiscus inexpectatus Rattray 1890 |
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| Coscinodiscus insutus Rattray 1890 |
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| Coscinodiscus interlineatus Rattray 1890 |
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| Coscinodiscus intermixtus Rattray 1890 |
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| Coscinodiscus irregularis Rattray 1890 |
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| Coscinodiscus javanensis Grunow in Rattray 1890 |
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| Coscinodiscus johnsonianus (Greville) Rattray 1890 |
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| Coscinodiscus lacunosus Grove in Rattray 1890 |
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| Coscinodiscus lacustris var. australiensis (Grunow) Rattray 1890 |
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| Coscinodiscus lacustris var. hyperborea (Grunow) Rattray 1890 |
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| Coscinodiscus lacustris var. septentrionalis (Grunow) Rattray 1890 |
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| Coscinodiscus leptopus var. discrepans Rattray 1890 |
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| Coscinodiscus lewisianus var. moronensis Rattray 1890 |
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