| Genus | Species Num | Strain Num | SOURCE |
|---|---|---|---|
| Sorangium | 1 | 1 | HMP |
| Sphaerobacter | 1 | 1 | HMP |
| Sphingobacterium | 1 | 2 | HMP |
| Sphingobium | 1 | 1 | HMP |
| Sphingomonas | 2 | 2 | HMP/MGYG |
| Sphingopyxis | 1 | 1 | HMP |
| Sporanaerobacter | 1 | 1 | MGYG |
| Stackebrandtia | 1 | 1 | HMP |
| Staphylococcus | 14 | 56 | HMP/MGYG |
| Starkeya | 1 | 1 | HMP |