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| Navicula sculpta var. temperei Frenguelli 1923 |
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| Navicula ventricosa var. elliptica Frenguelli 1923 |
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| Navicula viridis var. distinguenda (Cleve) Frenguelli 1923 |
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| Nitzschia amphioxys var. compacta (Hustedt in Schmidt et al.) Frenguelli 1923 |
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| Nitzschia amphioxys var. xerophila (Grunow in Cleve & Grunow) Frenguelli 1923 |
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| Nitzschia calica var. salinarum (Grunow in Cleve & Grunow) Frenguelli 1923 |
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| Nitzschia laevis Frenguelli 1923 |
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| Nitzschia levis Frenguelli 1923 |
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| Nitzschia paradoxa var. paucistriata Frenguelli 1923 |
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| Nitzschia vitrioides Frenguelli 1923 |
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| Rhopalodia gibberula var. argentina (Brun in Brun & Tempère) Frenguelli 1923 |
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| Sigmatella sigma (Kützing) Frenguelli 1923 |
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