| Species | RefIntense Num | Refseq Num | Source |
|---|---|---|---|
| Rickettsia rickettsii | 1 | 15 | HMP |
| Rickettsia typhi | 1 | 4 | HMP |
| Rickettsiella grylli | 1 | 2 | HMP |
| Rikenella microfusus | 1 | 2 | MGYG |
| Risungbinella massiliensis | 1 | 2 | MGYG |
| Robertmurraya massiliosenegalensis | 1 | 2 | MGYG |
| Robinsoniella peoriensis | 1 | 4 | MGYG |
| Roseburia faecis | 1 | 13 | MGYG |
| Roseburia hominis | 1 | 8 | MGYG |
| Roseburia intestinalis | 2 | 17 | HMP/MGYG |