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| Nitzschia punctata f. coarctata (Grunow in Cleve & Moller; Grunow in Cleve & Grunow) Hustedt 1957 |
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| Nitzschia sociabilis Hustedt 1957 |
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| Nitzschia thermalis f. intermedia (Grunow in Van Heurck) Hustedt 1957 |
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| Nitzschia visurgis Hustedt 1957 |
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| Pinnularia gibba f. linearis (Hustedt) Hustedt 1957 |
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| Pinnularia mesolepta f. vix undulata (vixundulata) Hustedt 1957 |
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| Pinnularia microstauron f. diminuta Grunow ex Hustedt 1957 |
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| Pinnularia microstauron f. linearis Otto Müller ex Hustedt 1957 |
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| Rhaphoneis surirella f. australis (Petit) Hustedt 1957 |
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| Rhaphoneis surirella f. subsalina (Petit) Hustedt 1957 |
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| Rhopalodia gibba f. ventricosa (Ehrenberg) Hustedt 1957 |
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| Rhopalodia gibba f. ventricosa (Kützing) Hustedt 1957 |
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| Stauroneis alabamae f. angulata (Heiden in Schmidt et al.) Hustedt 1957 |
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| Stauroneis borrichii f. subcapitata (Boye Petersen) Hustedt 1957 |
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| Stauroneis nana Hustedt 1957 |
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| Stauroneis smithii f. incisa (Pantocsek) Hustedt 1957 |
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| Surirella linearis f. constricta (Grunow) Hustedt 1957 |
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| Surirella nervosa (A. Schmidt) Hustedt 1957 |
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| Surirella splendida f. punctata (Hustedt) Hustedt 1957 |
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| Surirella tenera f. cristata Hustedt 1957 |
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