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| Coscinodiscus cocconeiformis var. tenuior Rattray 1890 |
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| Coscinodiscus compositus Rattray 1890 |
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| Coscinodiscus concinnus var. jonesiana (Greville) Rattray 1890 |
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| Coscinodiscus concinnus var. moseleyi (O'Meara) Rattray 1890 |
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| Coscinodiscus confertus Rattray 1890 |
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| Coscinodiscus conformis Rattray 1890 |
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| Coscinodiscus confusus Rattray 1890 |
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| Coscinodiscus cristatus Rattray 1890 |
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| Coscinodiscus cristatus var. distans Rattray 1890 |
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| Coscinodiscus curvatulus var. barbadensis Cleve manuscript, Rattray 1890 |
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| Coscinodiscus curvatulus var. recta Rattray 1890 |
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| Coscinodiscus debilis Rattray 1890 |
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| Coscinodiscus decussatus Grove & Sturt manuscript in Rattray 1890 |
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| Coscinodiscus delawarensis Grunow in Rattray 1890 |
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| Coscinodiscus denarius var. variolatus (Castracane) Rattray 1890 |
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| Coscinodiscus densus Grove & Sturt manuscript in Rattray 1890 |
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| Coscinodiscus depressus Gregory manuscript in Rattray 1890 |
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| Coscinodiscus diversus var. completus Rattray 1890 |
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| Coscinodiscus dubiosus Grunow manuscript in Rattray 1890 |
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| Coscinodiscus dubiosus var. curvans Rattray 1890 |
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