| angola | | dracunculus medinensis | species | 11 | 0 |
| anguilla | | anguillicola crassus | species | 0 | 103 |
| anguilla | | anguillicola novaezelandiae | species | 0 | 7 |
| anguilla | | anguillicola papernai | species | 0 | 2 |
| australia | | anguillicola australiensis | species | 49 | 0 |
| australia | | anguillicola crassus | species | 2 | 0 |
| australia | | anguillicola novaezelandiae | species | 30 | 0 |
| australia | | micropleura australiensis | species | 20 | 0 |
| australia | western australia | micropleura australiensis | species | 0 | 1 |
| austria | lower austria | anguillicola papernai | species | 2 | 0 |
| belgium | flemish region | anguillicola crassus | species | 0 | 2 |
| brazil | | rumai rumai | species | 1 | 0 |
| brazil | amazonas | nilonema senticosum | species | 0 | 1 |
| brazil | amazonas | rumai rumai | species | 0 | 1 |
| brazil | mato grosso | nilonema senticosum | species | 0 | 1 |
| cameroon | far north region | dracunculus medinensis | species | 0 | 1 |
| cameroon | north region | dracunculus medinensis | species | 0 | 1 |
| canada | new brunswick | anguillicola crassus | species | 0 | 1 |
| canada | nova scotia | anguillicola crassus | species | 6 | 3 |
| canada | ontario | dracunculus insignis | species | 59 | 3 |
| canada | ontario | dracunculus lutrae | species | 34 | 1 |
| canada | prince edward island | anguillicola crassus | species | 0 | 1 |
| chad | | dracunculus medinensis | species | 1602 | 0 |
| china | | anguillicola australiensis | species | 2 | 0 |
| china | | anguillicola crassus | species | 49 | 0 |
| china | | philometra sp. s.g.wu 060201 (cas) | species | 2 | 0 |
| china | | philometroides pseudorasbori | species | 1 | 0 |
| china | | philometroides sanguineus | species | 2 | 0 |
| china | guangdong | philometra lagocephali | species | 151 | 0 |
| china | hubei | dentiphilometra monopteri | species | 2 | 2 |
| china | hubei | philometra clavaeceps | species | 2 | 1 |
| china | hubei | philometroides carassii | species | 2 | 0 |
| china | hubei | philometroides cyprini | species | 2 | 0 |
| china | jiangxi | clavinema parasiluri | species | 2 | 0 |
| china | jiangxi | philometroides fulvidraconi | species | 3 | 0 |
| china | jiangxi | philometroides ganzhounensis | species | 2 | 0 |
| china | xinjiang | philometra fujimotoi | species | 2 | 0 |
| czech republic | | anguillicola crassus | species | 1 | 0 |
| ethiopia | | dracunculus medinensis | species | 36 | 0 |
| finland | | anguillicola crassus | species | 16 | 0 |
| finland | southwest finland region | philometra obturans | species | 0 | 1 |
| france | | anguillicola crassus | species | 123 | 0 |
| france | corse region | anguillicola crassus | species | 0 | 1 |
| france | ile-de-france region | dracunculus medinensis | species | 0 | 2 |
| germany | | anguillicola crassus | species | 15 | 0 |
| ghana | | dracunculus medinensis | species | 1 | 0 |
| ghana | ashanti region | dracunculus medinensis | species | 0 | 1 |
| ghana | northern region | dracunculus medinensis | species | 0 | 8 |
| ghana | upper east region | dracunculus medinensis | species | 0 | 1 |
| ghana | upper west region | dracunculus medinensis | species | 0 | 1 |
| ghana | volta region | dracunculus medinensis | species | 0 | 1 |
| ghana | western region | dracunculus medinensis | species | 0 | 2 |
| india | andhra pradesh | dracunculus medinensis | species | 0 | 1 |
| india | bihar | dracunculus medinensis | species | 0 | 1 |
| india | chandigarh | dracunculus medinensis | species | 0 | 1 |
| india | gujarat | dracunculus medinensis | species | 0 | 1 |
| india | madhya pradesh | dracunculus medinensis | species | 0 | 2 |
| india | maharashtra | dracunculus medinensis | species | 0 | 1 |
| india | odisha | dracunculus medinensis | species | 0 | 1 |
| india | rajasthan | dracunculus medinensis | species | 0 | 3 |
| india | uttar pradesh | dracunculus medinensis | species | 0 | 1 |
| india | west bengal | philometra sawara | species | 0 | 1 |
| ireland | | anguillicola crassus | species | 30 | 0 |
| italy | | anguillicola crassus | species | 30 | 0 |
| italy | lombardy region | molnaria intestinalis | species | 0 | 1 |
| japan | | anguillicola crassus | species | 55 | 0 |
| japan | | anguillicola globiceps | species | 14 | 0 |
| japan | aichi prefecture | anguillicola crassus | species | 0 | 1 |
| japan | chiba prefecture | philometra lateolabracis | species | 6 | 0 |
| japan | ehime prefecture | philometra madai | species | 1 | 0 |
| japan | hyogo prefecture | philometra sawara | species | 2 | 0 |
| japan | kagoshima prefecture | philometra nemipteri | species | 7 | 0 |
| japan | nagasaki prefecture | philometra sciaenae | species | 7 | 0 |
| japan | oita prefecture | philometroides seriolae | species | 2 | 0 |
| japan | osaka prefecture | philometroides seriolae | species | 1 | 0 |
| japan | shizuoka prefecture | dracunculus medinensis | species | 0 | 1 |
| japan | tokyo prefecture | philometra lateolabracis | species | 1 | 0 |
| japan | tokyo prefecture | philometra madai | species | 1 | 0 |
| kenya | | afrophilometra hydrocyoni | species | 1 | 0 |
| kenya | | mexiconema africanum | species | 1 | 0 |
| kenya | | philometra bagri | species | 1 | 0 |
| kenya | | philometra lati | species | 1 | 0 |
| kenya | | philometra spiriformis | species | 1 | 0 |
| kenya | rift valley province | dracunculus medinensis | species | 0 | 1 |
| madagascar | | anguillicola novaezelandiae | species | 2 | 0 |
| madagascar | | anguillicola papernai | species | 48 | 0 |
| maldives | | dracunculus medinensis | species | 0 | 2 |
| maldives | | philometra gymnosardae | species | 1 | 0 |
| mali | | dracunculus medinensis | species | 42 | 0 |
| mexico | | mexiconema cichlasomae | species | 6 | 0 |
| mexico | campeche | mexiconema cichlasomae | species | 0 | 1 |
| mexico | quintana roo | dentiphilometra monopteri | species | 0 | 1 |
| mexico | yucatan | mexiconema cichlasomae | species | 0 | 1 |
| new caledonia | | philometra ocularis | species | 1 | 1 |
| new zealand | | anguillicola novaezelandiae | species | 2 | 0 |
| nigeria | anambra | dracunculus medinensis | species | 0 | 1 |
| nigeria | bauchi | dracunculus medinensis | species | 0 | 1 |
| nigeria | borno | dracunculus medinensis | species | 0 | 1 |
| nigeria | ebonyi | dracunculus medinensis | species | 0 | 2 |
| nigeria | enugu | dracunculus medinensis | species | 0 | 1 |
| nigeria | imo | dracunculus medinensis | species | 0 | 2 |
| nigeria | katsina | dracunculus medinensis | species | 0 | 1 |
| nigeria | kwara | dracunculus medinensis | species | 0 | 7 |
| nigeria | oyo | dracunculus medinensis | species | 0 | 10 |
| nigeria | plateau | dracunculus medinensis | species | 0 | 1 |
| peru | loreto region | alinema amazonicum | species | 0 | 1 |
| poland | | anguillicola crassus | species | 12 | 0 |
| portugal | | anguillicola crassus | species | 15 | 0 |
| portugal | aveiro district | anguillicola crassus | species | 0 | 1 |
| reunion | | anguillicola crassus | species | 0 | 1 |
| russia | | skrjabillanus tincae | species | 1 | 0 |
| russia | kamchatka krai | philonema oncorhynchi | species | 0 | 1 |
| russia | karelia republic | philonema oncorhynchi | species | 0 | 1 |
| south africa | | anguillicola papernai | species | 44 | 0 |
| south korea | | clavinema sp. rf1 | species | 2 | 0 |
| south sudan | | dracunculus medinensis | species | 48 | 0 |
| spain | | anguillicola crassus | species | 43 | 0 |
| sudan | khartoum | dracunculus medinensis | species | 0 | 2 |
| sudan | river nile | dracunculus medinensis | species | 0 | 1 |
| sweden | | anguillicola crassus | species | 30 | 0 |
| taiwan | | anguillicola crassus | species | 87 | 1 |
| togo | | dracunculus medinensis | species | 0 | 1 |
| tunisia | | philometra saltatrix | species | 5 | 0 |
| tunisia | bizerte governorate | anguillicola crassus | species | 0 | 1 |
| turkey | | anguillicola crassus | species | 19 | 0 |
| turkey | hatay province | anguillicola crassus | species | 0 | 1 |
| united kingdom | | anguillicola crassus | species | 46 | 0 |
| united kingdom | england | anguillicola crassus | species | 0 | 1 |
| united kingdom | england | dracunculus medinensis | species | 0 | 1 |
| united kingdom | england | philometroides sanguineus | species | 0 | 1 |
| united kingdom | scotland | anguillicola crassus | species | 46 | 1 |
| united kingdom | scotland | dracunculus medinensis | species | 0 | 1 |
| united states | | anguillicola crassus | species | 92 | 0 |
| united states | | caranginema americanum | species | 1 | 0 |
| united states | | philometra brevispicula | species | 1 | 0 |
| united states | | philometra diplectri | species | 1 | 0 |
| united states | | philometra floridensis | species | 1 | 0 |
| united states | | philometra morii | species | 1 | 0 |
| united states | | philometra saltatrix | species | 1 | 0 |
| united states | | philometra sp. ah-2011 | species | 1 | 0 |
| united states | | philometroides grandipapillatus | species | 1 | 0 |
| united states | arkansas | anguillicola crassus | species | 0 | 1 |
| united states | arkansas | dracunculus insignis | species | 0 | 1 |
| united states | florida | caranginema americanum | species | 0 | 2 |
| united states | florida | dracunculus insignis | species | 0 | 1 |
| united states | florida | philometra brevispicula | species | 0 | 1 |
| united states | florida | philometra diplectri | species | 0 | 1 |
| united states | florida | philometra floridensis | species | 0 | 1 |
| united states | florida | philometroides grandipapillatus | species | 0 | 1 |
| united states | georgia | dracunculus insignis | species | 10 | 1 |
| united states | iowa | dracunculus sp. v3104 | species | 1 | 0 |
| united states | kentucky | dracunculus insignis | species | 0 | 2 |
| united states | louisiana | dracunculus globocephalus | species | 0 | 1 |
| united states | maine | anguillicola crassus | species | 0 | 1 |
| united states | maryland | anguillicola crassus | species | 0 | 1 |
| united states | maryland | dracunculus insignis | species | 0 | 1 |
| united states | massachusetts | anguillicola crassus | species | 464 | 1 |
| united states | massachusetts | dracunculus insignis | species | 0 | 1 |
| united states | mississippi | anguillicola crassus | species | 0 | 1 |
| united states | mississippi | dracunculus insignis | species | 0 | 1 |
| united states | mississippi | margolisianum bulbosum | species | 0 | 1 |
| united states | new hampshire | dracunculus insignis | species | 0 | 1 |
| united states | new york | anguillicola crassus | species | 0 | 1 |
| united states | new york | dracunculus insignis | species | 0 | 1 |
| united states | north carolina | dracunculus insignis | species | 0 | 1 |
| united states | north carolina | margolisianum bulbosum | species | 1 | 0 |
| united states | pennsylvania | dracunculus medinensis | species | 0 | 1 |
| united states | rhode island | anguillicola crassus | species | 0 | 1 |
| united states | south carolina | anguillicola crassus | species | 0 | 2 |
| united states | south carolina | dracunculus insignis | species | 0 | 1 |
| united states | south carolina | margolisianum bulbosum | species | 0 | 2 |
| united states | south carolina | philometra carolinensis | species | 0 | 2 |
| united states | south carolina | philometra cynoscionis | species | 0 | 1 |
| united states | south carolina | philometra overstreeti | species | 0 | 2 |
| united states | south carolina | philometra rubra | species | 0 | 2 |
| united states | south carolina | philometroides paralichthydis | species | 0 | 2 |
| united states | tennessee | dracunculus insignis | species | 0 | 1 |
| united states | virginia | dracunculus insignis | species | 0 | 1 |
| united states | west virginia | dracunculus insignis | species | 0 | 1 |
| uzbekistan | bukhara region | dracunculus medinensis | species | 0 | 1 |
| vietnam | yen bai province | dracunculus medinensis | species | 2 | 0 |