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| Biddulphia tuomeyi var. contorta Forti 1913 |
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| Biddulphia tuomeyi var. distenta Forti 1913 |
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| Biddulphia tuomeyi f. margaritifera (Shadbolt) Forti 1913 |
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| Biddulphia tuomeyi var. media Forti 1913 |
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| Cocconeis lanzii Forti 1913 |
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| Cocconeis praecellens f. ellipticostriata Forti 1913 |
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| Cocconeis praecellens f. paucistriata Forti 1913 |
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| Cocconeis praecellens f. subellipticostriata Forti 1913 |
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| Cocconeis vitrea var. minor Forti 1913 |
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| Coscinodiscus biangulatus var. reducta Forti 1913 |
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| Coscinodiscus denarius var. subtilissima Forti 1913 |
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| Coscinodiscus lewisianus var. minor Tempère in Forti 1913 |
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| Coscinodiscus moronensis var. latilimba Forti 1913 |
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| Coscinodiscus pseudoactinocyclus Forti 1913 |
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| Coscinodiscus rhombicus var. crassipunctata Forti 1913 |
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| Coscinodiscus rhombicus var. lanceolata Forti 1913 |
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| Coscinodiscus symbolophorus var. intactus Forti 1913 |
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| Hyalodiscus radiatus var. parva Forti 1913 |
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| Leudugeria epithemioides (epithemoides) var. brevis (Tempère & Peragallo) Forti 1913 |
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| Leudugeria janischiana Forti 1913 |
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