| china | | candidatus ishikawaella capsulata | species | 1 | 0 |
| japan | hiroshima prefecture | candidatus ishikawaella capsulata | species | 1 | 0 |
| japan | hyogo prefecture | candidatus ishikawaella capsulata | species | 1 | 0 |
| japan | ibaraki prefecture | candidatus ishikawaella capsulata | species | 1 | 0 |
| japan | kagoshima prefecture | candidatus ishikawaella capsulata | species | 1 | 0 |
| japan | kochi prefecture | ishikawaella symbiont of coptosoma japonicum | species | 1 | 0 |
| japan | kochi prefecture | ishikawaella symbiont of coptosoma parvipictum | species | 1 | 0 |
| japan | okinawa prefecture | ishikawaella symbiont of brachyplatys subaeneus | species | 1 | 0 |
| japan | okinawa prefecture | ishikawaella symbiont of brachyplatys vahlii | species | 2 | 0 |
| japan | okinawa prefecture | ishikawaella symbiont of coptosoma sphaerula | species | 1 | 0 |
| japan | okinawa prefecture | ishikawaella symbiont of megacopta cribraria | species | 2 | 0 |
| japan | saga prefecture | ishikawaella symbiont of coptosoma parvipictum | species | 1 | 0 |
| japan | saitama prefecture | ishikawaella symbiont of coptosoma parvipictum | species | 1 | 0 |
| turkey | | uncultured candidatus ishikawaella sp. | species | 1 | 0 |
| united states | | candidatus ishikawaella capsulata | species | 1 | 0 |
| united states | georgia | candidatus ishikawaella capsulata | species | 1 | 1 |