| austria | | methanomassiliicoccales archaeon rumen m1 | species | 183 | 0 |
| austria | | methanomassiliicoccales archaeon rumen m2 | species | 19 | 0 |
| austria | | uncultured methanomassiliicoccales archaeon | species | 38 | 0 |
| canada | alberta | methanomassiliicoccaceae archaeon uba248 | species | 1 | 0 |
| canada | alberta | methanomassiliicoccaceae archaeon uba472 | species | 1 | 0 |
| china | | methanomassiliicoccus luminyensis | species | 2 | 0 |
| china | | uncultured methanomassiliicoccales archaeon | species | 13 | 0 |
| china | | uncultured methanomassiliicoccus sp. | species | 216 | 0 |
| china | hunan | methanomassiliicoccaceae archaeon uba387 | species | 1 | 0 |
| china | hunan | methanomassiliicoccaceae archaeon uba394 | species | 1 | 0 |
| china | hunan | methanomassiliicoccaceae archaeon uba396 | species | 1 | 0 |
| china | hunan | methanomassiliicoccaceae archaeon uba404 | species | 1 | 0 |
| china | hunan | methanomassiliicoccaceae archaeon uba407 | species | 1 | 0 |
| china | hunan | methanomassiliicoccaceae archaeon uba408 | species | 1 | 0 |
| china | hunan | methanomassiliicoccaceae archaeon uba409 | species | 1 | 0 |
| china | hunan | methanomassiliicoccus sp. uba386 | species | 1 | 0 |
| china | hunan | methanomassiliicoccus sp. uba393 | species | 1 | 0 |
| china | jiangsu | uncultured methanomassiliicoccales archaeon | species | 1 | 0 |
| china | sichuan | methanomassiliicoccaceae archaeon uba414 | species | 1 | 0 |
| china | sichuan | methanomassiliicoccaceae archaeon uba415 | species | 1 | 0 |
| china | sichuan | methanomassiliicoccaceae archaeon uba421 | species | 1 | 0 |
| china | sichuan | methanomassiliicoccaceae archaeon uba427 | species | 1 | 0 |
| china | tibet | candidatus methanomethylophilus alvus | species | 1 | 0 |
| china | yunnan | methanomassiliicoccaceae archaeon uba296 | species | 1 | 0 |
| china | yunnan | methanomassiliicoccaceae archaeon uba298 | species | 1 | 0 |
| china | yunnan | methanomassiliicoccaceae archaeon uba308 | species | 1 | 0 |
| china | yunnan | methanomassiliicoccaceae archaeon uba309 | species | 1 | 0 |
| china | yunnan | methanomassiliicoccaceae archaeon uba314 | species | 1 | 0 |
| china | yunnan | methanomassiliicoccaceae archaeon uba317 | species | 1 | 0 |
| china | yunnan | methanomassiliicoccaceae archaeon uba319 | species | 1 | 0 |
| china | yunnan | methanomassiliicoccaceae archaeon uba328 | species | 1 | 0 |
| china | yunnan | methanomassiliicoccaceae archaeon uba329 | species | 1 | 0 |
| china | yunnan | methanomassiliicoccaceae archaeon uba333 | species | 1 | 0 |
| china | yunnan | methanomassiliicoccaceae archaeon uba343 | species | 1 | 0 |
| china | yunnan | methanomassiliicoccaceae archaeon uba344 | species | 1 | 0 |
| china | yunnan | methanomassiliicoccaceae archaeon uba354 | species | 1 | 0 |
| china | yunnan | methanomassiliicoccaceae archaeon uba358 | species | 1 | 0 |
| china | yunnan | methanomassiliicoccaceae archaeon uba359 | species | 1 | 0 |
| china | yunnan | methanomassiliicoccaceae archaeon uba366 | species | 1 | 0 |
| china | yunnan | methanomassiliicoccaceae archaeon uba367 | species | 1 | 0 |
| china | yunnan | methanomassiliicoccaceae archaeon uba378 | species | 1 | 0 |
| china | yunnan | methanomassiliicoccaceae archaeon uba381 | species | 1 | 0 |
| china | yunnan | methanomassiliicoccaceae archaeon uba399 | species | 1 | 0 |
| china | yunnan | methanomassiliicoccaceae archaeon uba400 | species | 1 | 0 |
| china | yunnan | methanomassiliicoccaceae archaeon uba593 | species | 1 | 0 |
| china | yunnan | methanomassiliicoccus sp. uba292 | species | 1 | 0 |
| china | yunnan | methanomassiliicoccus sp. uba315 | species | 1 | 0 |
| china | yunnan | methanomassiliicoccus sp. uba321 | species | 1 | 0 |
| china | yunnan | methanomassiliicoccus sp. uba335 | species | 1 | 0 |
| china | yunnan | methanomassiliicoccus sp. uba360 | species | 1 | 0 |
| china | yunnan | methanomassiliicoccus sp. uba364 | species | 1 | 0 |
| china | yunnan | methanomassiliicoccus sp. uba382 | species | 1 | 0 |
| czech republic | | uncultured methanomassiliicoccus sp. | species | 1 | 0 |
| denmark | | candidatus methanomethylophilus sp. 1r26 | species | 102 | 0 |
| denmark | | uncultured methanomassiliicoccales archaeon | species | 5 | 0 |
| france | | candidatus methanomassiliicoccus intestinalis issoire-mx1 | no rank | 2 | 0 |
| france | | candidatus methanomethylophilus alvus mx1201 | no rank | 3 | 0 |
| germany | | candidatus methanoplasma termitum | species | 2 | 0 |
| germany | | uncultured methanomassiliicoccales archaeon | species | 12 | 0 |
| germany | hamburg | methanomassiliicoccaceae archaeon uba113 | species | 1 | 0 |
| india | | candidatus methanomethylophilus alvus | species | 6 | 0 |
| india | | candidatus methanomethylophilus alvus mx1201 | no rank | 1 | 0 |
| india | | methanomassiliicoccus luminyensis | species | 1 | 0 |
| india | | uncultured candidatus methanomethylophilus sp. | species | 3 | 0 |
| india | | uncultured methanomassiliicoccus sp. | species | 2 | 0 |
| japan | | candidatus methanomassiliicoccus intestinalis | species | 77 | 0 |
| japan | | uncultured methanomassiliicoccus sp. | species | 1 | 0 |
| japan | tokyo prefecture | candidatus methanogranum caenicola | species | 2 | 0 |
| kenya | | methanomassiliicoccaceae archaeon uba271 | species | 1 | 0 |
| kenya | | methanomassiliicoccaceae archaeon uba48 | species | 1 | 0 |
| kenya | | methanomassiliicoccaceae archaeon uba480 | species | 1 | 0 |
| kenya | | methanomassiliicoccaceae archaeon uba481 | species | 1 | 0 |
| kenya | | methanomassiliicoccaceae archaeon uba482 | species | 1 | 0 |
| kenya | | methanomassiliicoccaceae archaeon uba483 | species | 1 | 0 |
| kuwait | | uncultured methanomassiliicoccus sp. | species | 1 | 0 |
| malaysia | | candidatus methanomethylophilus sp. uba78 | species | 1 | 0 |
| malaysia | | methanomassiliicoccaceae archaeon uba72 | species | 1 | 0 |
| malaysia | | methanomassiliicoccaceae archaeon uba75 | species | 1 | 0 |
| nigeria | | uncultured methanomassiliicoccus sp. | species | 78 | 0 |
| slovakia | | uncultured methanomassiliicoccus sp. | species | 1 | 0 |
| svalbard and jan mayen | | uncultured methanomassiliicoccales archaeon | species | 4 | 0 |
| tanzania | | uncultured methanomassiliicoccales archaeon | species | 2 | 0 |