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| Coscinodiscus frigidus (Cleve-Euler) Cleve-Euler 1951 |
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| Coscinodiscus lacustris f. deformis (Cleve-Euler) Cleve-Euler 1951 |
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| Cyclotella bodanica f. borealis (Cleve-Euler) Cleve-Euler 1951 |
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| Melosira islandica var. vanernsis (Cleve-Euler) Cleve-Euler 1951 |
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| Stephanodiscus binderanus var. oestrupi (Cleve-Euler) Cleve-Euler 1951 |
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| Stephanopyxis melosiroides f. calva (Cleve-Euler) Cleve-Euler 1951 |
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| Triceratium parallelum var. suecicum (Cleve-Euler) Cleve-Euler 1951 |
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| Asteromphalus brookei var. humboldtii (Ehrenberg) Cleve-Euler 1951 |
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| Melosira italica f. laevis (Ehrenberg) Cleve-Euler 1951 |
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| Paralia sulcata f. coronata (Ehrenberg) Cleve-Euler 1951 |
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| Stephanodiscus astraea var. niagarae (Ehrenberg) Cleve-Euler 1951 |
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| Triceratium arcticum var. balaena (Ehrenberg; Ehrenberg) Cleve-Euler 1951 |
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| Chaetoceros anastomosans var. externus (Gran) Cleve-Euler 1951 |
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| Coscinodiscus polychordus (Gran) Cleve-Euler 1951 |
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| Eucampia groenlandica var. atlantica (Gran) Cleve-Euler 1951 |
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| Rhizosolenia alata var. genuina (Gran; Gran) Cleve-Euler 1951 |
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| Melosira distans var. decipiens (Grove in Schmidt et al.) Cleve-Euler 1951 |
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| Coscinodiscus balticus (Grunow in Cleve & Grunow) Cleve-Euler 1951 |
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| Melosira jüergensii (juergensi) var. bothnica (bottnica) (Grunow in Cleve & Möller) Cleve-Euler 1951 |
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| Actinocyclus subtilis var. arcticus (Grunow in Van Heurck) Cleve-Euler 1951 |
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