| australia | | uncultured gallionella sp. | species | 3 | 0 |
| china | | uncultured gallionella sp. | species | 12 | 0 |
| india | | uncultured gallionella sp. | species | 2 | 0 |
| japan | ishikawa prefecture | uncultured gallionella sp. | species | 1 | 0 |
| japan | shimane prefecture | uncultured gallionella sp. | species | 27 | 0 |
| netherlands | | uncultured gallionella sp. | species | 2 | 0 |
| russia | irkutsk oblast | uncultured gallionella sp. | species | 1 | 0 |
| russia | zabaykalsky krai | uncultured gallionella sp. | species | 2 | 0 |
| spain | | uncultured gallionella sp. | species | 1 | 0 |
| united kingdom | wales | uncultured gallionella sp. | species | 1 | 0 |
| united states | massachusetts | uncultured gallionella sp. | species | 3 | 0 |
| vietnam | | uncultured gallionella sp. | species | 1 | 0 |