| Reported in | Status | Registered by | ||
|---|---|---|---|---|
| Muricauda chongwuensis | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago | |
| Muricauda aurea | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago | |
| Muricauda antarctica | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago | |
| Muricauda abyssi | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago | |
| Mucisphaera | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago | |
| Mucisphaera calidilacus T | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago | |
| Mucilaginibacter straminoryzae | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago | |
| Mucilaginibacter robiniae | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago | |
| Mucilaginibacter rivuli | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago | |
| Mucilaginibacter pallidiroseus | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago | |
| Mucilaginibacter flavidus | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago | |
| Mucilaginibacter conchicola | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago | |
| Mucilaginibacter aurantiaciroseus | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago | |
| Mucilaginibacter achroorhodeus | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago | |
| Moraxella urethralis | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago | |
| Moraxella saccharolytica | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago | |
| Moraxella phenylpyruvica | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago | |
| Moraxella nasovis | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago | |
| Moraxella anatipestifera | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago | |
| Moraxella anatipestifer | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago | |
| Moorella thermoautotrophica | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago | |
| Mongoliitalea daihaiensis | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago | |
| Monashia | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago | |
| Monashia flava T | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago | |
| Moheibacter lacus | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago | |
| Modestobacter deserti | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago | |
| Mobiluncus curtisii subsp. holmesii | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago | |
| Mobiluncus curtisii subsp. curtisii | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago | |
| Mitsuokella multiacidus | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago | |
| Mitsuokella dentalis | Unknown | Valid (ICNP) | Excubia bot almost 3 years ago |