| Reported in | Status | Registered by | ||
|---|---|---|---|---|
| Meiothermus roseus | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Meiothermus chliarophilus | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Megasphaera hominis | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Megasphaera butyrica | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Meganema | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Meganema perideroedes | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Megamonas hypermegas | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Megalodesulfovibrio gigas | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Mediterraneibacter hominis | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Mediannikoviicoccus | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Mediannikoviicoccus vaginalis | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Massilia soli | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Massilia polaris | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Massilia forsythiae | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Massilia eburnea | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Massilia cavernae | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Massilia antarctica | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Marivivens geojensis | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Maritimibacter dapengensis | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Maritalea mediterranea | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Maripseudobacter | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Maripseudobacter aurantiacus | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Marinomonas vulgaris | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Marinomonas vaga | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Marinomonas lutimaris | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Marinomonas basaltis | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Marinomonas aquamarina | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Marinococcus hispanicus | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Marinococcus albus | Unknown | Valid (ICNP) | Excubia bot over 1 year ago | |
| Marinobacterium ramblicola | Unknown | Valid (ICNP) | Excubia bot over 1 year ago |