| canada | british columbia | gigantobilharzia | genus | 0 | 1 |
| india | | gigantobilharzia melanoidis | species | 1 | 0 |
| iran | khuzestan province | gigantobilharzia | genus | 0 | 1 |
| japan | hyogo prefecture | gigantobilharzia | genus | 0 | 1 |
| japan | hyogo prefecture | gigantobilharzia sturniae | species | 0 | 1 |
| russia | moscow city | gigantobilharzia | genus | 0 | 1 |
| russia | moscow oblast | gigantobilharzia | genus | 0 | 1 |
| spain | galicia | gigantobilharzia | genus | 0 | 1 |
| united arab emirates | | gigantobilharzia melanoidis | species | 4 | 0 |
| united states | | gigantobilharzia huronensis | species | 8 | 0 |
| united states | arizona | gigantobilharzia huronensis | species | 0 | 1 |