| Genus | Species Num | Strain Num | SOURCE |
|---|---|---|---|
| Opitutus | 1 | 1 | HMP |
| Oribacterium | 2 | 4 | HMP/MGYG |
| Orientia | 1 | 2 | HMP |
| Oscillibacter | 1 | 1 | MGYG |
| Oxalobacter | 1 | 4 | HMP/MGYG |
| Paenarthrobacter | 1 | 1 | HMP |
| Paenibacillus | 17 | 17 | HMP/MGYG |
| Paeniclostridium | 1 | 1 | MGYG |
| Pantoea | 8 | 9 | HMP/MGYG |
| Parabacteroides | 11 | 14 | HMP/MGYG |