Coscinodiscaceae
| Brightwellia | Coscinodiscus | Coscinosira | Cosmiodiscus | |
| Craspedodiscus | Cyclotella | Druridgea | Endictya | |
| Ethmodiscus | Gossleriella | Heterodictyon | Hyalodiscus | |
| Hydrosirella | Melosira | Planktoniella | Podosira | |
| Pyxidicula | Stephanodiscus | Stephanopyxis | Thalassiosira | |
| Aulacosira # | Paralia # | Pleurosira # | Ellerbeckia # | |
| Heterodictya # | Liradiscus # | Gyrodiscus # | Glyptodiscus # | |
Mit # gekennzeichnete Gattungen sind nicht im Bestimmungsschlüssel erfaßt.
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| Brightwellia . |
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| Coscinodiscus . |
2 | 3 | 4 | |
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| 5 . |
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| 6 . |
7 | 8 |
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| Craspedodiscus . |
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| Cyclotella . |
2 | 3 |
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| Hyalodiscus . |
2 | 3 |
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| Melosira . |
2 |
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| 5 . |
6 | 7 |
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| Podosira . |
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| Stephanodiscus . |
2 | 3 | 4 | |
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| 5 . |
6 |
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| 7 . |
8 |
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| Stephanopyxis . |
2 | 3 |
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| Thalassiosira . |
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| Aulacosira
# . |
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| Paralia
# . |
2 |
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| Pleurosira
# . |
2 |
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| Ellerbeckia
# . |
2 |
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| Heterodictya
# . |
2 |
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| Liradiscus
# . |
2 |
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| Gyrodiscus
# . |
2 |
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| Glyptodiscus
# . |
2 |