| Species | RefIntense Num | Refseq Num | Source |
|---|---|---|---|
| Mixta calida | 1 | 4 | MGYG |
| Mobilicoccus massiliensis | 1 | 2 | MGYG |
| Mobiluncus curtisii | 2 | 17 | HMP |
| Mobiluncus mulieris | 3 | 20 | HMP |
| Moellerella wisconsensis | 1 | 9 | MGYG |
| Moorella thermoacetica | 1 | 16 | HMP |
| Moraxella catarrhalis | 1 | 209 | HMP |
| Morganella morganii | 3 | 196 | MGYG |
| Murdochiella massiliensis | 1 | 2 | MGYG |
| Murdochiella vaginalis | 1 | 2 | MGYG |