| austria | | isopterygiopsis muelleriana | species | 3 | 0 |
| china | | isopterygiopsis muelleriana | species | 5 | 0 |
| japan | | isopterygiopsis muelleriana | species | 6 | 0 |
| japan | fukushima prefecture | isopterygiopsis muelleriana | species | 2 | 0 |
| russia | | isopterygiopsis muelleriana | species | 16 | 0 |
| united kingdom | scotland | isopterygiopsis muelleriana | species | 16 | 0 |
| united states | north carolina | isopterygiopsis muelleriana | species | 3 | 0 |