| italy | | uncultured methylacidiphilum sp. | species | 2 | 0 |
| mexico | chiapas | methylacidiphilum fumariolicum | species | 50 | 0 |
| new zealand | | methylacidiphilum infernorum v4 | no rank | 1 | 0 |
| new zealand | | methylacidiphilum sp. | species | 1 | 0 |
| new zealand | | methylacidiphilum sp. rtk17.1 | species | 167 | 0 |
| portugal | acores autonomous region | methylacidiphilum fumariolicum | species | 653 | 0 |
| russia | kamchatka krai | methylacidiphilum kamchatkense | species | 1 | 0 |
| russia | kostroma oblast | methylacidiphilum kamchatkense | species | 1 | 0 |
| united states | west virginia | uncultured methylacidiphilaceae bacterium | species | 2 | 0 |