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| Biddulphia roperiana var. obtusa (Kützing) Frenguelli 1938 |
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| Donkinia recta var. rostrata Frenguelli 1938 |
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| Glyphodesmis costatum (Peragallo & Peragallo) Frenguelli 1938 |
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| Gyrosigma neglectum Frenguelli 1938 |
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| Gyrosigma sulcatum (Grunow in Cleve & Grunow) Frenguelli 1938 |
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| Hantzschia minima Frenguelli 1938 |
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| Mastogloia pumila var. lanceolata Frenguelli 1938 |
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| Mastogloia pumila var. tetramera Frenguelli 1938 |
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| Melosira echinus Frenguelli 1938 |
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| Navicula humerosa var. ovalis Frenguelli 1938 |
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| Navicula pennata f. maxima (Cleve) Frenguelli 1938 |
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| Nitzschia fina Frenguelli 1938 |
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| Nitzschia minuscula Frenguelli 1938 |
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| Opephora perminuta (Grunow in Van Heurck) Frenguelli 1938 |
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| Plagiogramma interruptum var. tenuistriata (Cleve) Frenguelli 1938 |
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| Pleurosigma lanceolatum f. undulata Frenguelli 1938 |
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| Vanheurckia blasii Frenguelli 1938 |
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