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| Achnanthes lanceolata var. baicalensis (Skvortzow & Meyer) Frenguelli 1941 |
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| Caloneis pinnularia Frenguelli 1941 |
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| Caloneis silicula var. elliptica (Frenguelli) Frenguelli 1941 |
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| Eunotia pseudoindica Frenguelli 1941 |
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| Eunotia pseudoindica var. gracilis (Hustedt in Schmidt et al.) Frenguelli 1941 |
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| Eunotia pyramidata var. undulata Frenguelli 1941 |
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| Fragilaria alternata Frenguelli 1941 |
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| Fragilaria longirostris Frenguelli 1941 |
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| Gephyria parodii Frenguelli 1941 |
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| Gomphonema demerarae (Grunow) Frenguelli 1941 |
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| Gomphonema subclavatum var. gracilis (Hustedt) Frenguelli 1941 |
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| Gomphonema turris var. coarctata (Frenguelli) Frenguelli 1941 |
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| Navicula dapalis Frenguelli 1941 |
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| Navicula guatemalensis var. pampeana (Frenguelli) Frenguelli 1941 |
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| Navicula mutica var. constricta Frenguelli 1941 |
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| Navicula pseudannulata Frenguelli 1941 |
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| Navicula rhynchocephaloides Frenguelli 1941 |
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| Navicula riojae (riojoe) var. punctata Frenguelli 1941 |
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| Navicula serena Frenguelli 1941 |
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| Navicula soluta Frenguelli 1941 |
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| Navicula stigmata Frenguelli 1941 |
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| Navicula stigmata var. rostrata Frenguelli 1941 |
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| Navicula subcreta Frenguelli 1941 |
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| Neidium affine (affinis) var. constricta Frenguelli 1941 |
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| Neidium platense Frenguelli 1941 |
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| Pinnularia doeringii var. undulata (Frenguelli) Frenguelli 1941 |
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| Surirella minuta var. peduliformis Frenguelli 1941 |
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| Synedra goulardi var. fluviatilis (Lemmermann) Frenguelli 1941 |
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| Tryblionella panduriformis var. minor (Grunow in Cleve & Grunow) Frenguelli 1941 |
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