| Class | Genus | Species No. | Strain No. |
|---|---|---|---|
| Choanoflagellatea | Salpingoeca | 1 | 1 |
| Sarcomonadea | Sandona | 9 | 12 |
| Chlorophyceae | Scenedesmus | 6 | 11 |
| Schizocladiophyceae | Schizocladia | 1 | 1 |
| Dinophyceae | Scrippsiella | 2 | 7 |
| Cyanophyceae | Scytonema | 2 | 2 |
| Chlorophyceae | Selenastrum | 1 | 1 |
| Bacillariophyceae | Sellaphora | 1 | 3 |
| Bacillariophyceae | Skeletonema | 9 | 18 |
| Cyanophyceae | Sphaerospermopsis | 5 | 36 |
| Charophyceae | Sphaerozosma | 1 | 1 |
| Charophyceae | Spinoclosterium | 1 | 1 |
| Cyanophyceae | Spirulina | 1 | 4 |
| Chrysophyceae | Spumella | 1 | 1 |
| Cyanophyceae | Stanieria | 1 | 1 |
| Charophyceae | Staurastrum | 5 | 5 |
| Chlorophyceae | Stauridium | 1 | 1 |
| Charophyceae | Staurodesmus | 1 | 1 |
| Trebouxiophyceae | Stichococcus | 2 | 4 |
| Chlorophyceae | Stigeoclonium | 3 | 3 |
| Cyanophyceae | Stigonema | 1 | 1 |
| Placididea | Suigetsumonas | 1 | 1 |
| Dinophyceae | Symbiodinium | 2 | 7 |
| Bicoecea | Symbiomonas | 1 | 1 |
| Cyanophyceae | Symploca | 1 | 1 |
| Cyanophyceae | Synechococcus | 2 | 57 |
| Chrysophyceae | Synura | 3 | 5 |
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