| Reported in | Status | Registered by | ||
|---|---|---|---|---|
| Micropruina sonneratiae | Unknown | Valid (ICNP) | Excubia bot 3 months ago | |
| Micromonospora sicca | Unknown | Valid (ICNP) | Excubia bot 3 months ago | |
| Micromonospora palythoicola | Unknown | Valid (ICNP) | Excubia bot 3 months ago | |
| Microbispora bryophytorum subsp. camponoti | Unknown | Valid (ICNP) | Excubia bot 3 months ago | |
| Microbispora bryophytorum subsp. bryophytorum | Unknown | Valid (ICNP) | Excubia bot 3 months ago | |
| Microbacterium capsulatum | Unknown | Valid (ICNP) | Excubia bot 3 months ago | |
| Microbacterium candidum | Unknown | Valid (ICNP) | Excubia bot 3 months ago | |
| Microbacterium betulae | Unknown | Valid (ICNP) | Excubia bot 3 months ago | |
| Microbacterium albopurpureum | Unknown | Valid (ICNP) | Excubia bot 3 months ago | |
| Microbacterium albipurpureum | Tsavkelova et al., 2024 and Oren, Göker, 2025 | Valid (ICNP) | Excubia bot 3 months ago | |
| Methylorubrum subtropicum | Unknown | Valid (ICNP) | Excubia bot 3 months ago | |
| Methyloraptor | Saltykova et al., 2025 | Valid (ICNP) | Excubia bot 3 months ago | |
| Methyloraptor flagellatus T | Unknown | Valid (ICNP) | Excubia bot 3 months ago | |
| Methylobacterium litchii | Unknown | Valid (ICNP) | Excubia bot 3 months ago | |
| Methylobacterium guangdongense | Unknown | Valid (ICNP) | Excubia bot 3 months ago | |
| Methanospirillum purgamenti | Unknown | Valid (ICNP) | Excubia bot 3 months ago | |
| Methanoeremita | Zhou et al., 2024 | Valid (ICNP) | Excubia bot 3 months ago | |
| Methanoeremita antiquus T | Unknown | Valid (ICNP) | Excubia bot 3 months ago | |
| Methanococcoides cohabitans | Unknown | Valid (ICNP) | Excubia bot 3 months ago | |
| Methanochimaera | Zhou et al., 2024 | Valid (ICNP) | Excubia bot 3 months ago | |
| Methanochimaera problematica T | Unknown | Valid (ICNP) | Excubia bot 3 months ago | |
| Methanobacterium aridiramus | Unknown | Valid (ICNP) | Excubia bot 3 months ago | |
| Metabacillus sediminis | Unknown | Valid (ICNP) | Excubia bot 3 months ago | |
| Metabacillus rhizosphaerae | Unknown | Valid (ICNP) | Excubia bot 3 months ago | |
| Mesocryomonas | Sbissi et al., 2025 | Valid (ICNP) | Excubia bot 3 months ago | |
| Mesocryomonas glaciei T | Unknown | Valid (ICNP) | Excubia bot 3 months ago | |
| Mediterraneibacter flintii | Unknown | Valid (ICNP) | Excubia bot 3 months ago | |
| Marivivens marinum | Unknown | Valid (ICNP) | Excubia bot 3 months ago | |
| Marivirga salinarum | Unknown | Valid (ICNP) | Excubia bot 3 months ago | |
| Marinobacter apostichopi | Unknown | Valid (ICNP) | Excubia bot 3 months ago |