| Reported in | Status | Registered by | ||
|---|---|---|---|---|
| Maridesulfovibrio salinus | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Marichromatium fluminis | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Maribellus maritimus | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Maribaculum | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Maribaculum marinum T | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Mangrovimonas futianensis | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Mangrovicoccus algicola | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Mangrovactinospora | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Mangrovactinospora gilvigrisea T | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Mameliella sediminis | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Mameliella phaeodactyli | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Mameliella atlantica | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Malacoplasma | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Malacoplasma penetrans | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Malacoplasma muris | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Malacoplasma microti | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Malacoplasma iowae T | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Malaciobacter | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Malaciobacter pacificus | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Malaciobacter mytili | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Malaciobacter molluscorum | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Malaciobacter marinus | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Malaciobacter halophilus T | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Malaciobacter canalis | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Macromonas mobilis T | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Macromonas mobile | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Macrococcus armenti | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Mabikibacter | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Mabikibacter ruber T | Unknown | Valid (ICNP) | Excubia bot about 3 years ago | |
| Lysobacter thermophilus | Unknown | Valid (ICNP) | Excubia bot about 3 years ago |