| MMDBm0000218 | Methanobrevibacter smithii ATCC 35061 | Archaea | Euryarchaeota | Not Available | Metabolic reconstruction | VMH |
| MMDBm0000327 | Paracoccus denitrificans | Eubacteria | Proteobacteria | Not Available | Microbial culture | Not Available |
| MMDBm0000346 | Methylorubrum extorquens | Eubacteria | Proteobacteria | Human | Microbial culture | Not Available |
| MMDBm0000348 | Methylosinus trichosporium | Eubacteria | Proteobacteria | Not Available | Not Available | RHEA |
| MMDBm0000555 | Methanothermus fervidus | Archaea | Euryarchaeota | Not Available | Not Available | RHEA |
| MMDBm0000556 | Methanococcus vannielii | Archaea | Euryarchaeota | Not Available | Not Available | RHEA |
| MMDBm0000557 | Methanococcus voltae | Archaea | Euryarchaeota | Not Available | Not Available | RHEA |
| MMDBm0000558 | Methanotorris igneus | Archaea | Euryarchaeota | Not Available | Microbial culture | Not Available |
| MMDBm0000559 | Methanocaldococcus jannaschii | Archaea | Euryarchaeota | Not Available | Microbial culture | Not Available |
| MMDBm0000562 | Methanosarcina barkeri | Archaea | Euryarchaeota | Not Available | Microbial culture | Not Available |
| MMDBm0000565 | Methanothrix thermoacetophila | Archaea | Euryarchaeota | Not Available | Microbial culture | Not Available |
| MMDBm0000657 | Acetobacterium woodii | Eubacteria | Firmicutes | Not Available | Microbial culture | Not Available |
| MMDBm0000748 | Methanocaldococcus infernus | Archaea | Euryarchaeota | Not Available | Microbial culture | Not Available |
| MMDBm0000759 | Methanocaldococcus vulcanius | Archaea | Euryarchaeota | Not Available | Microbial culture | Not Available |
| MMDBm0000773 | Methanocaldococcus fervens | Archaea | Euryarchaeota | Not Available | Microbial culture | Not Available |
| MMDBm0000887 | Methylocella silvestris | Eubacteria | Proteobacteria | Not Available | Microbial culture | Not Available |
| MMDBm0000947 | Methylotenera mobilis | Eubacteria | Proteobacteria | Not Available | Microbial culture | Not Available |
| MMDBm0000976 | Methanosphaerula palustris | Archaea | Euryarchaeota | Not Available | Microbial culture | Not Available |
| MMDBm0000984 | Methylacidiphilum infernorum | Eubacteria | Verrucomicrobia | Not Available | Microbial culture | Not Available |
| MMDBm0000997 | Methanocaldococcus villosus | Archaea | Euryarchaeota | Not Available | Microbial culture | Not Available |
| MMDBm0001817 | Methanobrevibacter ruminantium M1 | Archaea | Euryarchaeota | Not Available | Metabolic reconstruction | VMH |
| MMDBm0001818 | Methanocaldococcus jannaschii DSM 2661 | Archaea | Euryarchaeota | Not Available | Not Available | RHEA |
| MMDBm0001838 | Methanopyrus kandleri AV19 | Archaea | Euryarchaeota | Not Available | Not Available | RHEA |
| MMDBm0001843 | Methanosarcina acetivorans C2A | Archaea | Euryarchaeota | Not Available | Not Available | RHEA |
| MMDBm0001845 | Methanosarcina barkeri str. Fusaro | Archaea | Euryarchaeota | Not Available | Not Available | RHEA |
