| argentina | buenos aires province | maritrema prosthometra | species | 0 | 1 |
| australia | queensland | longiductotrema tethepae | species | 4 | 0 |
| australia | queensland | microphallidae gen. sp. scc-2015 | species | 2 | 0 |
| australia | queensland | microphallus minutus | species | 4 | 0 |
| canada | | microphallus similis | species | 1 | 0 |
| canada | newfoundland and labrador | microphallus similis | species | 8 | 0 |
| chile | | microphallidae gen. sp. zl-2016 | species | 10 | 0 |
| denmark | | microphallus primas | species | 4 | 0 |
| india | | microphallidae sp. lg-2009 | species | 3 | 0 |
| india | manipur | microphallus sp. vt-2013 | species | 4 | 0 |
| ireland | | microphallus primas | species | 1 | 0 |
| ireland | northern ireland | maritrema oocysta | species | 2 | 0 |
| ireland | northern ireland | microphallus abortivus | species | 9 | 0 |
| ireland | northern ireland | microphallus similis | species | 3 | 0 |
| japan | okinawa prefecture | microphallidae sp. kk2014 | species | 3 | 0 |
| kuwait | | maritrema eroliae | species | 4 | 2 |
| kuwait | | maritrema neomi | species | 0 | 1 |
| kuwait | | probolocoryphe uca | species | 2 | 3 |
| new zealand | | maritrema deblocki | species | 2 | 0 |
| new zealand | | maritrema novaezealandense | species | 2 | 0 |
| new zealand | | maritrema poulini | species | 8 | 0 |
| new zealand | auckland | microphallidae sp. ngr.cg.1 | species | 3 | 0 |
| new zealand | marlborough | microphallidae sp. ngk.cg.1 | species | 1 | 0 |
| new zealand | otago | maritrema novaezealandense | species | 1 | 1 |
| portugal | | maritrema portucalense | species | 1 | 0 |
| portugal | | microphallus primas | species | 2 | 0 |
| portugal | aveiro district | microphallidae sp. cercaria sevillana | species | 0 | 1 |
| portugal | aveiro district | microphallus primas | species | 0 | 1 |
| russia | primorsky krai | microphallus similis | species | 24 | 0 |
| slovakia | presov region | microphallidae sp. 3lf-1471 | species | 1 | 0 |
| slovakia | presov region | microphallidae sp. 3lf-1498 | species | 1 | 0 |
| slovakia | presov region | microphallidae sp. 3lf-1549 | species | 1 | 0 |
| slovakia | presov region | microphallidae sp. 3lf-1550 | species | 1 | 0 |
| spain | galicia | gynaecotyla longiintestinata | species | 0 | 2 |
| spain | galicia | microphallus primas | species | 0 | 1 |
| spain | galicia | microphallus similis | species | 0 | 2 |
| sweden | | microphallus similis | species | 2 | 0 |
| ukraine | | candidotrema loossi | species | 1 | 0 |
| united kingdom | | maritrema arenaria | species | 1 | 0 |
| united kingdom | | maritrema oocysta | species | 1 | 0 |
| united kingdom | | microphallus abortivus | species | 1 | 0 |
| united kingdom | | microphallus fusiformis | species | 1 | 0 |
| united kingdom | | microphallus primas | species | 1 | 0 |
| united kingdom | | microphallus similis | species | 1 | 0 |
| united kingdom | northern ireland | microphallus similis | species | 3 | 0 |
| united states | | floridatrema heardi | species | 1 | 0 |
| united states | | maritrema prosthometra | species | 1 | 0 |
| united states | | microphallus basodactylophallus | species | 1 | 0 |
| united states | california | probolocoryphe uca | species | 0 | 1 |
| united states | florida | floridatrema heardi | species | 0 | 1 |
| united states | georgia | microphallus turgidus | species | 0 | 1 |
| united states | texas | maritrema arenaria | species | 0 | 1 |