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| Diploneis elliptica f. minor Cleve-Euler 1939 |
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| Diploneis oblongella var. fossilis (Pantocsek) Cleve-Euler 1939 |
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| Diploneis oblongella var. medioinflata Cleve-Euler 1939 |
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| Diploneis ostrobottnica Cleve-Euler 1939 |
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| Eunotia angusta var. densestriata (Fontell) A. Berg ex Cleve-Euler 1939 |
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| Eunotia gracilis var. reflexa Cleve-Euler 1939 |
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| Eunotia zygodon Cleve-Euler 1939 |
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| Frustulia interposita f. minor Cleve-Euler 1939 |
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| Gomphonema acuminatum var. vanheurckii (Pantocsek) Cleve-Euler 1939 |
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| Melosira distans var. humilis Cleve-Euler 1939 |
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| Navicula citrus Cleve-Euler 1939 |
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| Navicula paanaensis Cleve-Euler 1939 |
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| Neidium affine f. constricta Cleve-Euler 1939 |
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| Neidium affine f. globosa Cleve-Euler 1939 |
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| Neidium bisulcatum var. major (A. Cleve) A. Cleve-Euler 1939 |
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| Neidium dubium var. didelta Cleve-Euler 1939 |
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| Neidium iridis var. subampliata (Grunow) Cleve-Euler 1939 |
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| Neidium septentrionalis Cleve-Euler 1939 |
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| Nitzschia praelonga var. sigmoidea Cleve-Euler 1939 |
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| Nitzschia tryblionella var. suborbicularis Cleve-Euler 1939 |
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