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| Cyclotella kuetzingiana f. verticillata Cleve-Euler 1951 |
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| Cyclotella ladogensis Cleve-Euler 1951 |
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| Cyclotella melosiriodes var. scandica Cleve-Euler 1951 |
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| Cyclotella meneghiniana f. binotata (Grunow in Van Heurck) Cleve-Euler 1951 |
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| Cyclotella meneghiniana var. genuina Cleve-Euler 1951 |
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| Cyclotella meneghiniana f. minor Cleve-Euler 1951 |
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| Cyclotella meneghiniana f. unipunctata Cleve-Euler 1951 |
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| Cyclotella operculata var. genuina Cleve-Euler 1951 |
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| Cyclotella operculata var. inaequipunctata Cleve-Euler 1951 |
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| Cyclotella sjabatjakkensis Cleve-Euler 1951 |
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| Cyclotella socialis var. planctonica (Brunnthaler) Cleve-Euler 1951 |
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| Cyclotella socialis var. schuettii Cleve-Euler 1951 |
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| Cyclotella stelligera f. tenuis (Hustedt) Cleve-Euler 1951 |
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| Cyclotella stelligera f. typica Cleve-Euler 1951 |
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| Cyclotella striata var. americana Cleve-Euler 1951 |
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| Cyclotella vaetteri Cleve-Euler 1951 |
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| Cyclotella virihensis Cleve-Euler 1951 |
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| Cyclotella vorticosa A. Berg in Cleve-Euler 1951 |
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| Eucampia groenlandica var. atlantica (Gran) Cleve-Euler 1951 |
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| Eucampia groenlandica var. typica Cleve-Euler 1951 |
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