| argentina | | ogmogaster antarctica | species | 2 | 0 |
| australia | | catatropis indicus | species | 2 | 0 |
| canada | | notocotylus sp. mag-2016 | species | 1 | 0 |
| canada | manitoba | quinqueserialis quinqueserialis | species | 77 | 0 |
| canada | northwest territories | quinqueserialis quinqueserialis | species | 44 | 0 |
| canada | ontario | quinqueserialis quinqueserialis | species | 1 | 0 |
| canada | quebec | notocotylus sp. bold:aca9471 | species | 2 | 0 |
| chile | | ogmogaster antarctica | species | 1 | 0 |
| china | | notocotylus intestinalis | species | 2 | 0 |
| china | | ogmocotyle sikae | species | 1 | 0 |
| china | hunan | ogmocotyle sikae | species | 4 | 0 |
| china | hunan | ogmocotyle sp. jm-2015 | species | 4 | 0 |
| france | | tristriata anatis | species | 6 | 0 |
| france | bretagne region | tristriata anatis | species | 3 | 0 |
| germany | | notocotylus attenuatus | species | 1 | 0 |
| germany | berlin | catatropis verrucosa | species | 0 | 1 |
| germany | lower saxony | quinqueserialis quinqueserialis | species | 0 | 1 |
| germany | saxony | quinqueserialis quinqueserialis | species | 0 | 1 |
| iceland | | tristriata anatis | species | 4 | 0 |
| japan | iwate prefecture | ogmocotyle capricorni | species | 1 | 0 |
| kenya | | notocotylidae sp. msb para 25299 | species | 2 | 0 |
| mexico | chihuahua | notocotylus attenuatus | species | 0 | 1 |
| new zealand | canterbury | notocotylidae gen. sp. 1 nz | species | 2 | 0 |
| new zealand | canterbury | notocotylidae gen. sp. 2 nz | species | 32 | 0 |
| norway | | tristriata anatis | species | 5 | 0 |
| norway | troms county | notocotylus sp. ak-2017 | species | 1 | 0 |
| norway | troms county | tristriata anatis | species | 12 | 0 |
| poland | lodz province | catatropis verrucosa | species | 0 | 1 |
| poland | pomorskie province | catatropis verrucosa | species | 0 | 1 |
| poland | pomorskie province | notocotylus attenuatus | species | 0 | 1 |
| poland | west pomerania province | catatropis verrucosa | species | 0 | 1 |
| poland | west pomerania province | notocotylus attenuatus | species | 0 | 2 |
| russia | | tristriata anatis | species | 53 | 0 |
| russia | kamchatka krai | tristriata anatis | species | 129 | 0 |
| thailand | chiang mai province | catatropis indicus | species | 0 | 1 |
| united kingdom | | notocotylus sp. uk-po-2003 | species | 1 | 0 |
| united kingdom | england | notocotylus malhamensis | species | 0 | 1 |
| united states | alabama | quinqueserialis quinqueserialis | species | 17 | 0 |
| united states | california | ogmogaster antarctica | species | 0 | 1 |
| united states | florida | notocotylus attenuatus | species | 0 | 1 |
| united states | minnesota | quinqueserialis quinqueserialis | species | 12 | 0 |
| united states | nebraska | notocotylus sp. bh-2008 | species | 1 | 0 |
| united states | texas | notocotylus attenuatus | species | 0 | 1 |
| united states | virginia | quinqueserialis quinqueserialis | species | 16 | 0 |
| vietnam | | notocotylus intestinalis | species | 10 | 0 |