| Class | Genus | Species No. | Strain No. |
|---|---|---|---|
| Ulvophyceae | Ulothrix | 1 | 2 |
| Prymnesiophyceae | Umbilicosphaera | 3 | 3 |
| Cyanophyceae | Umezakia | 1 | 1 |
| Chlorarachniophyceae | Unidentified chlorarachniophyte | 1 | 1 |
| Pelagophyceae | Unidentified coccoid pelagophyte | 1 | 2 |
| Prasinophyceae | Unidentified coccoid prasinophyte | 1 | 7 |
| Cyanophyceae | Unidentified cyanobacterium | 1 | 2 |
| Metamonada incertae sedis | Unidentified metamonad | 1 | 1 |
| Pedinophyceae | Unidentified pedinophyte | 1 | 1 |
| Pelagophyceae | Unidentified pelagophyte | 1 | 2 |
| Heterokontophyta incertae sedis | Unidentified yellow heterokontophyte | 1 | 1 |
| Chlorophyceae | Urnella | 1 | 1 |
| Chrysophyceae | Uroglena | 1 | 1 |
| Chlorophyceae | Uronema | 2 | 3 |
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