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| Amphora veneta var. gibbosa Frenguelli 1926 |
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| Anomoeoneis sculpta var. apiculata Frenguelli 1926 |
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| Anomoeoneis sculpta var. minima Frenguelli 1926 |
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| Anomoeoneis sculpta var. ornata Frenguelli 1926 |
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| Campylodiscus clypeus f. minor (Pantocsek) Frenguelli 1926 |
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| Fragilaria construens var. trigibba (Pantocsek) Frenguelli 1926 |
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| Fragilaria peragalli Frenguelli 1926 |
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| Gomphonema berggrenii var. capitata Frenguelli 1926 |
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| Gomphonema cruciferum Frenguelli 1926 |
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| Gomphonema subclavatum var. fossilis Frenguelli 1926 |
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| Hantzschia amphioxys var. exilis Frenguelli 1926 |
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| Hantzschia faba Frenguelli 1926 |
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| Hantzschia limi Frenguelli 1926 |
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| Hantzschia limi var. minor Frenguelli 1926 |
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| Hyalodiscus schmidtii Frenguelli 1926 |
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| Navicula affinis f. minor Frenguelli 1926 |
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| Navicula borealis f. minor (M. Peragallo & Héribaud) Frenguelli 1926 |
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| Navicula brevistriata (Van Heurck) Frenguelli 1926 |
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| Navicula columnaris var. undulata Frenguelli 1926 |
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| Navicula delicata Frenguelli 1926 |
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