| methanobrevibacter gottschalkii | species | archaea | bacteria | species | 190974 |
| methanobrevibacter millerae | species | archaea | bacteria | species | 230361 |
| methanobrevibacter olleyae | species | archaea | bacteria | species | 294671 |
| methanobrevibacter smithii | species | archaea | bacteria | species | 2173 |
| methanobrevibacter sp. | no rank | archaea | bacteria | species | 66852 |
| methanobrevibacter sp. 229/11 | no rank | | | species | 1452342 |
| methanobrevibacter sp. 229/14 | no rank | | | species | 1452343 |
| methanobrevibacter sp. 229/4 | no rank | | | species | 1452340 |
| methanobrevibacter sp. 229/5 | no rank | | | species | 1452341 |
| methanobrevibacter sp. 87.7 | no rank | archaea | bacteria | species | 387957 |