| Species | RefIntense Num | Refseq Num | Source |
|---|---|---|---|
| Roseburia inulinivorans | 2 | 14 | HMP/MGYG |
| Roseobacter denitrificans | 1 | 3 | HMP |
| Rothia aeria | 1 | 7 | MGYG |
| Rothia dentocariosa | 3 | 16 | HMP/MGYG |
| Rothia mucilaginosa | 7 | 23 | HMP/MGYG |
| Rubeoparvulum massiliense | 1 | 2 | MGYG |
| Rubrobacter xylanophilus | 1 | 3 | HMP |
| Ruminococcus bicirculans | 1 | 11 | MGYG |
| Ruminococcus bromii | 3 | 20 | MGYG |
| Ruminococcus callidus | 1 | 4 | MGYG |