| argentina | entre rios province | nematodirus spathiger | species | 0 | 1 |
| argentina | santa cruz province | nematodirus spathiger | species | 5 | 0 |
| australia | new south wales | nematodirus spathiger | species | 0 | 2 |
| australia | queensland | nematodirus spathiger | species | 0 | 1 |
| australia | south australia | nematodirus filicollis | species | 0 | 1 |
| australia | victoria | nematodirus spathiger | species | 0 | 1 |
| austria | salzburg | nematodirus battus | species | 0 | 1 |
| canada | ontario | nematodirus helvetianus | species | 0 | 1 |
| canada | prince edward island | nematodirus battus | species | 3 | 0 |
| china | | nematodirus oiratianus | species | 2 | 0 |
| china | | nematodirus sp. nmg-2010 | species | 1 | 0 |
| china | | nematodirus spathiger | species | 2 | 0 |
| china | inner mongolia | nematodirus helvetianus | species | 7 | 0 |
| china | inner mongolia | nematodirus oiratianus | species | 3 | 0 |
| china | shaanxi | nematodirus oiratianus | species | 8 | 0 |
| china | shaanxi | nematodirus spathiger | species | 6 | 0 |
| ethiopia | dire dawa region | nematodirus filicollis | species | 0 | 1 |
| ethiopia | harari region | nematodirus filicollis | species | 0 | 1 |
| ethiopia | somali region | nematodirus filicollis | species | 0 | 1 |
| france | | nematodirus europaeus | species | 2 | 0 |
| france | | nematodirus spathiger | species | 2 | 0 |
| germany | bavaria | nematodirus battus | species | 0 | 1 |
| germany | bavaria | nematodirus filicollis | species | 0 | 1 |
| germany | schleswig-holstein | nematodirus helvetianus | species | 0 | 1 |
| india | jammu and kashmir | nematodirus spathiger | species | 0 | 3 |
| iran | | nematodirella cameli | species | 6 | 0 |
| iran | | nematodirus oiratianus | species | 2 | 0 |
| iran | fars province | nematodirella cameli | species | 2 | 0 |
| iraq | | nematodirus helvetianus | species | 2 | 0 |
| iraq | | nematodirus spathiger | species | 2 | 0 |
| ireland | | nematodirus battus | species | 1 | 0 |
| italy | lazio region | nematodirus europaeus | species | 1 | 0 |
| italy | piemonte region | nematodirus abnormalis | species | 0 | 1 |
| italy | piemonte region | nematodirus davtiani alpinus | subspecies | 15 | 0 |
| italy | piemonte region | nematodirus filicollis | species | 0 | 1 |
| italy | piemonte region | nematodirus helvetianus | species | 0 | 1 |
| italy | piemonte region | nematodirus oiratianus | species | 1 | 0 |
| italy | piemonte region | nematodirus rupicaprae | species | 1 | 0 |
| italy | piemonte region | nematodirus spathiger | species | 0 | 1 |
| italy | tuscany region | nematodirus filicollis | species | 0 | 1 |
| kenya | central province | nematodirus helvetianus | species | 0 | 1 |
| morocco | souss-massa-draa | nematodirus oiratianus | species | 24 | 0 |
| morocco | souss-massa-draa | nematodirus spathiger | species | 7 | 0 |
| netherlands | flevoland province | nematodirus helvetianus | species | 0 | 1 |
| netherlands | gelderland province | nematodirus battus | species | 0 | 1 |
| netherlands | utrecht province | nematodirus helvetianus | species | 0 | 1 |
| new zealand | | nematodirus filicollis | species | 5 | 0 |
| new zealand | | nematodirus spathiger | species | 6 | 0 |
| nigeria | oyo | nematodirus battus | species | 0 | 1 |
| nigeria | sokoto | nematodirus battus | species | 0 | 1 |
| norway | | nematodirus battus | species | 3 | 0 |
| russia | krasnodar krai | nematodirus helvetianus | species | 17 | 0 |
| south africa | eastern cape province | nematodirus helvetianus | species | 0 | 2 |
| south africa | eastern cape province | nematodirus spathiger | species | 0 | 5 |
| south africa | free state province | nematodirus spathiger | species | 0 | 1 |
| south africa | the western cape province | nematodirus abnormalis | species | 0 | 1 |
| south africa | the western cape province | nematodirus spathiger | species | 0 | 3 |
| spain | | nematodiroides zembrae | species | 3 | 0 |
| spain | andalusia | nematodirus spathiger | species | 0 | 1 |
| syria | hama governorate | nematodirus oiratianus | species | 0 | 1 |
| tunisia | | nematodirus helvetianus | species | 30 | 0 |
| tunisia | | nematodirus spathiger | species | 7 | 0 |
| tunisia | gafsa governorate | nematodirus helvetianus | species | 8 | 0 |
| tunisia | gafsa governorate | nematodirus spathiger | species | 1 | 0 |
| tunisia | medenine governorate | nematodirus helvetianus | species | 5 | 0 |
| tunisia | medenine governorate | nematodirus spathiger | species | 10 | 0 |
| tunisia | sidi bouzid governorate | nematodirus helvetianus | species | 13 | 0 |
| tunisia | sidi bouzid governorate | nematodirus spathiger | species | 3 | 0 |
| tunisia | tozeur governorate | nematodirus helvetianus | species | 12 | 0 |
| tunisia | tunis governorate | nematodirus helvetianus | species | 8 | 0 |
| tunisia | tunis governorate | nematodirus spathiger | species | 7 | 0 |
| turkey | sanliurfa province | nematodirus spathiger | species | 0 | 1 |
| turkey | van province | nematodirus oiratianus | species | 0 | 1 |
| united kingdom | england | nematodirus battus | species | 6 | 3 |
| united kingdom | northern ireland | nematodirus battus | species | 0 | 1 |
| united kingdom | scotland | nematodirus battus | species | 6 | 6 |
| united kingdom | scotland | nematodirus filicollis | species | 1 | 0 |
| united kingdom | wales | nematodirus battus | species | 0 | 1 |
| united states | | nematodirus helvetianus | species | 15 | 0 |
| united states | california | nematodirus filicollis | species | 0 | 1 |
| united states | california | nematodirus helvetianus | species | 0 | 3 |
| united states | california | nematodirus spathiger | species | 0 | 1 |
| united states | georgia | nematodirus spathiger | species | 0 | 1 |
| united states | maine | nematodirus helvetianus | species | 0 | 2 |
| united states | nevada | nematodirus helvetianus | species | 0 | 1 |
| united states | new york | nematodirus helvetianus | species | 0 | 1 |
| united states | oregon | nematodirus battus | species | 5 | 2 |
| united states | oregon | nematodirus oiratianus | species | 0 | 1 |
| united states | washington | nematodirus helvetianus | species | 0 | 1 |