| WebNameShort | |
| Coscinodiscus pectinatus Rattray 1890 |
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| Coscinodiscus perforatus var. delicatula Rattray 1890 |
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| Coscinodiscus perikompsos Rattray 1890 |
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| Coscinodiscus perikompsos var. curta Rattray 1890 |
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| Coscinodiscus perminutus Rattray 1890 |
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| Coscinodiscus planiusculus Rattray 1890 |
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| Coscinodiscus polurrhaptos Rattray 1890 |
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| Coscinodiscus praetor Grove manuscript in Rattray 1890 |
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| Coscinodiscus proteus (Hardman manuscript, Van Heurck) Rattray 1890 |
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| Coscinodiscus pulcherrimus Rattray 1890 |
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| Coscinodiscus pumilus Grunow in Rattray 1890 |
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| Coscinodiscus punctatus var. rhombica (Castracane) Rattray 1890 |
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| Coscinodiscus pusillus Grove ms. in Rattray 1890 |
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| Coscinodiscus quindenarius (Ehrenberg) Rattray 1890 |
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| Coscinodiscus radiatus var. crenulatus (crenulata) Rattray 1890 |
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| Coscinodiscus radiatus var. minor (Schmidt) Rattray 1890 |
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| Coscinodiscus rhombicus (Grunow in Van Heurck) Rattray 1890 |
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| Coscinodiscus robustus var. fragilis Rattray 1890 |
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| Coscinodiscus robustus var. kittoniana Rattray 1890 |
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| Coscinodiscus rothii var. actinocycloides (Pantocsek) Rattray 1890 |
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