| Species | RefIntense Num | Refseq Num | Source |
|---|---|---|---|
| Massilibacterium senegalense | 1 | 2 | MGYG |
| Massilimicrobiota timonensis | 1 | 3 | MGYG |
| Massilioclostridium coli | 1 | 2 | MGYG |
| Megamonas funiformis | 1 | 13 | MGYG |
| Megasphaera elsdenii | 1 | 16 | MGYG |
| Megasphaera massiliensis | 1 | 14 | MGYG |
| Meiothermus ruber | 1 | 4 | HMP |
| Mesomycoplasma hyopneumoniae | 1 | 25 | HMP |
| Mesoplasma florum | 1 | 12 | HMP |
| Mesorhizobium japonicum | 1 | 12 | HMP |