| Genus | Species Num | Strain Num | SOURCE |
|---|---|---|---|
| Rhodopirellula | 1 | 1 | HMP |
| Rhodopseudomonas | 1 | 6 | HMP |
| Rhodospirillum | 2 | 2 | HMP |
| Rhodothermus | 1 | 1 | HMP |
| Rickettsia | 13 | 13 | HMP |
| Rickettsiella | 1 | 1 | HMP |
| Rikenella | 1 | 1 | MGYG |
| Rippkaea | 1 | 2 | HMP |
| Risungbinella | 1 | 1 | MGYG |
| Robertmurraya | 1 | 1 | MGYG |