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| Coscinodiscus galapagensis (Grunow in Van Heurck) Rattray 1890 |
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| Coscinodiscus gemmifer var. campechiana Grunow ex Rattray 1890 |
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| Coscinodiscus gigas var. californica O'Meara ex Rattray 1890 |
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| Coscinodiscus gigas var. diorama (Schmidt in Schmidt et al.) Rattray 1890 |
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| Coscinodiscus gigas var. guineensis (Grunow) Rattray 1890 |
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| Coscinodiscus gigas var. laxa Rattray 1890 |
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| Coscinodiscus gigas var. punctiformis Rattray 1890 |
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| Coscinodiscus glaberrimus Rattray 1890 |
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| Coscinodiscus gracilentus Rattray 1890 |
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| Coscinodiscus grandineus Rattray 1890 |
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| Coscinodiscus grandineus var. dentata Rattray 1890 |
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| Coscinodiscus granulosus var. conspicua Rattray 1890 |
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| Coscinodiscus granulosus var. distincta Rattray 1890 |
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| Coscinodiscus grayianus Rattray 1890 |
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| Coscinodiscus griseus var. apiculata Rattray 1890 |
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| Coscinodiscus groveanus Rattray 1890 |
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| Coscinodiscus grunowii var. minor (Pantocsek) Rattray 1890 |
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| Coscinodiscus heteromorphus Rattray 1890 |
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| Coscinodiscus hirtulus (Grunow in Van Heurck) Rattray 1890 |
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| Coscinodiscus humilis Rattray 1890 |
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