| Genus | Species Num | Strain Num | SOURCE |
|---|---|---|---|
| Rubeoparvulum | 1 | 1 | MGYG |
| Rubneribacter | 1 | 1 | MGYG |
| Rubrobacter | 1 | 1 | HMP |
| Ruegeria | 1 | 1 | HMP |
| Ruminiclostridium | 2 | 2 | HMP |
| Ruminococcus | 8 | 10 | HMP/MGYG |
| Ruthenibacterium | 1 | 1 | MGYG |
| Saccharomonospora | 1 | 1 | HMP |
| Saccharophagus | 1 | 1 | HMP |
| Saccharopolyspora | 1 | 1 | HMP |