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| Nitzschia gracilis var. minor Skabichevskii in Proschkina-Lavrenko 1950 |
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| Nitzschia hustedtii Sheshukova in Proschkina-Lavrenko 1950 |
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| Nitzschia marginulata f. minuta (Grunow in Cleve & Grunow) Proschkina-Lavrenko 1950 |
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| Nitzschia telezkoensis Sheshukova (Scheschukova) in Proschkina-Lavrenko 1950 |
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| Opephora marina var. perminuta (Grunow in Van Heurck) Proschkina-Lavrenko 1950 |
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| Opephora martyi var. amphioxys Poretsky in Proschkina-Lavrenko 1950 |
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| Opephora martyi var. polymorpha (Jouravleva) Proschkina-Lavrenko 1950 |
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| Pinnularia gibba f. interrupta (Cleve) Proschkina-Lavrenko 1950 |
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| Pinnularia meister f. armenica Poretzky in Proschkina-Lavrenko 1950 |
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| Pinnularia nodosa var. palibinii Poretsky ex Proschkina-Lavrenko 1950 |
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| Pinnularia quadratarea (quadratacea, quadrataria) f. grunowii (Schulz) Proschkina-Lavrenko 1950 |
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| Plagiogramma pulchellum var. fenestra (fenestrata) (Brun in Brun & Tempère) Proschkina-Lavrenko 1950 |
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| Plagiogramma pulchellum var. robusta (Brun in Brun & Tempère) Proschkina-Lavrenko 1950 |
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| Rhopalodia anasthasiae (Pantocsek) Kisselev in Proschkina-Lavrenko 1950 |
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| Rhopalodia arcuata (Pantocsek) Kisselev in Proschkina-Lavrenko 1950 |
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| Rhopalodia arcuata var. minor (Pantocsek) Kisselev in Proschkina-Lavrenko 1950 |
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| Rhopalodia cleopatrae (Pantocsek) Kisselev in Proschkina-Lavrenko 1950 |
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| Rhopalodia gibba var. arcuata (Missuna) Kisselev in Proschkina-Lavrenko 1950 |
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| Rhopalodia gibba var. incisa (Missuna) Kisselev in Proschkina-Lavrenko 1950 |
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| Rhopalodia gibba var. mongolica (Østrup) Proschkina-Lavrenko 1950 |
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