| brazil | | uncultured methanogenium sp. | species | 4 | 0 |
| china | | uncultured methanogenium sp. | species | 53 | 0 |
| china | hunan | uncultured methanogenium sp. | species | 2 | 0 |
| france | | uncultured methanogenium sp. | species | 1 | 0 |
| india | | uncultured methanogenium sp. | species | 1 | 0 |
| nigeria | | uncultured methanogenium sp. | species | 4 | 0 |
| turkey | | uncultured methanogenium sp. | species | 1 | 0 |