| albania | | dina krilata | species | 3 | 0 |
| albania | | dina latestriata | species | 1 | 0 |
| albania | | dina ohridana | species | 2 | 0 |
| albania | | dina sp. tw-2010 | species | 5 | 0 |
| argentina | | helobdella simplex | species | 3 | 0 |
| argentina | chaco province | haementeria paraguayensis | species | 3 | 0 |
| australia | | chtonobdella bilineata | species | 9 | 0 |
| australia | | chtonobdella gloriosi | species | 5 | 0 |
| australia | | chtonobdella mediorubra | species | 3 | 0 |
| australia | | chtonobdella pungens | species | 4 | 0 |
| australia | | chtonobdella sp. 'green' | species | 1 | 0 |
| australia | | chtonobdella tanae | species | 18 | 0 |
| australia | | chtonobdella whitmani | species | 23 | 0 |
| australia | | freshwater leech | species | 1 | 0 |
| australia | | helobdella europaea | species | 2 | 0 |
| australia | | neoterrabdella australis | species | 3 | 0 |
| australia | | philaemon gloriosi | species | 3 | 0 |
| australia | | philaemon pungens | species | 3 | 0 |
| australia | | philaemon sp. 'brown' eb-2010 | species | 3 | 0 |
| australia | | philaemon sp. 'green' eb-2010 | species | 3 | 0 |
| australia | | terrestrial leech | species | 1 | 0 |
| australia | queensland | haemadipsa | genus | 0 | 1 |
| australia | queensland | terrestrial leech | species | 0 | 1 |
| australia | victoria | haemadipsa | genus | 0 | 1 |
| australia | victoria | terrestrial leech | species | 0 | 1 |
| azerbaijan | | hirudo orientalis | species | 2 | 0 |
| azerbaijan | | limnatis paluda | species | 1 | 0 |
| bolivia | | helobdella nununununojensis | species | 1 | 0 |
| bolivia | | helobdella ringueleti | species | 1 | 0 |
| bolivia | | helobdella sorojchi | species | 1 | 0 |
| bolivia | | helobdella triserialis | species | 3 | 0 |
| brazil | | haementeria sp. tsc62le | species | 1 | 0 |
| brazil | | haementeria sp. tsc64le | species | 1 | 0 |
| brazil | | oligobdella brasiliensis | species | 2 | 0 |
| brazil | sao paulo | haementeria vizottoi | species | 29 | 0 |
| brunei | | zeylanicobdella arugamensis | species | 39 | 0 |
| burkina faso | high-basins region | placobdella fimbriata | species | 10 | 0 |
| cambodia | | haemadipsa interrupta | species | 11 | 0 |
| cambodia | | haemadipsa trimaculosa | species | 292 | 0 |
| canada | | erpobdella bucera | species | 5 | 0 |
| canada | | erpobdella microstoma | species | 6 | 0 |
| canada | | erpobdella obscura | species | 154 | 0 |
| canada | | erpobdella punctata | species | 95 | 0 |
| canada | | glossiphonia elegans | species | 1 | 0 |
| canada | | helobdella lineata | species | 1 | 0 |
| canada | | placobdella parasitica | species | 2 | 0 |
| canada | | placobdella phalera | species | 1 | 0 |
| canada | | placobdella rugosa | species | 5 | 0 |
| canada | | placobdella sophieae | species | 1 | 0 |
| canada | alberta | erpobdella montezuma | species | 1 | 0 |
| canada | alberta | erpobdella obscura | species | 4 | 0 |
| canada | alberta | glossiphoniidae sp. bold:aav0355 | species | 4 | 0 |
| canada | alberta | haemopis kingi | species | 5 | 0 |
| canada | alberta | haemopis sp. bold:aai1954 | species | 2 | 0 |
| canada | alberta | helobdella modesta | species | 5 | 0 |
| canada | alberta | motobdella montezuma | species | 3 | 0 |
| canada | alberta | placobdella sp. 1 ddc-2017 | species | 4 | 0 |
| canada | british columbia | haemopis kingi | species | 2 | 0 |
| canada | british columbia | helobdella stagnalis | species | 1 | 0 |
| canada | british columbia | motobdella montezuma | species | 1 | 0 |
| canada | manitoba | erpobdella obscura | species | 9 | 0 |
| canada | manitoba | erpobdellidae sp. bold:aaf9628 | species | 15 | 0 |
| canada | manitoba | glossiphonia elegans | species | 6 | 0 |
| canada | manitoba | glossiphoniidae sp. bold:aaf9645 | species | 1 | 0 |
| canada | manitoba | glossiphoniidae sp. bold:aaf9646 | species | 1 | 0 |
| canada | manitoba | glossiphoniidae sp. bold:aan6509 | species | 1 | 0 |
| canada | manitoba | haemopis sp. bold:aai1954 | species | 1 | 0 |
| canada | manitoba | helobdella modesta | species | 5 | 0 |
| canada | manitoba | motobdella montezuma | species | 2 | 0 |
| canada | manitoba | placobdella ornata | species | 1 | 0 |
| canada | manitoba | placobdella rugosa | species | 11 | 0 |
| canada | nunavut | crangonobdella spitzbergensis | species | 1 | 0 |
| canada | ontario | erpobdella microstoma | species | 1 | 0 |
| canada | ontario | erpobdella obscura | species | 1 | 0 |
| canada | ontario | erpobdella punctata | species | 7 | 0 |
| canada | ontario | erpobdellidae sp. bold:aav0360 | species | 1 | 0 |
| canada | ontario | glossiphonia elegans | species | 1 | 0 |
| canada | ontario | haemopis sp. bold:aby6228 | species | 1 | 0 |
| canada | ontario | helobdella stagnalis | species | 3 | 0 |
| canada | ontario | macrobdella decora | species | 12 | 0 |
| canada | ontario | placobdella hollensis | species | 7 | 0 |
| canada | ontario | placobdella ornata | species | 1 | 0 |
| canada | ontario | placobdella parasitica | species | 9 | 0 |
| canada | ontario | placobdella phalera | species | 8 | 0 |
| canada | ontario | placobdella picta | species | 12 | 0 |
| canada | ontario | placobdella rugosa | species | 16 | 0 |
| canada | saskatchewan | placobdella picta | species | 1 | 0 |
| canada | saskatchewan | placobdella rugosa | species | 3 | 0 |
| canada | saskatchewan | placobdella sp. 1 ddc-2017 | species | 4 | 0 |
| chile | | americobdella valdiviana | species | 2 | 0 |
| chile | | helobdella cordobensis | species | 1 | 0 |
| chile | | helobdella duplicata | species | 1 | 0 |
| chile | | helobdella pichipanan | species | 3 | 0 |
| chile | | mesobdella gemmata | species | 3 | 0 |
| chile | santiago metropolitan region | chtonobdella skottsbergi | species | 1 | 0 |
| chile | santiago metropolitan region | nesophilaemon skottsbergii | species | 62 | 0 |
| china | | haemadipsa cavatuses | species | 4 | 0 |
| china | | haemadipsa crenata | species | 2 | 0 |
| china | | haemadipsa hainana | species | 1 | 0 |
| china | | haemadipsa limuna | species | 3 | 0 |
| china | | tritetrabdella taiwana | species | 4 | 0 |
| china | anhui | hirudo nipponia | species | 1 | 0 |
| china | chongqing | hirudo nipponia | species | 1 | 0 |
| china | guangxi | poecilobdella manillensis | species | 1 | 0 |
| china | guizhou | hirudo nipponia | species | 1 | 0 |
| china | inner mongolia | tritetrabdella taiwana | species | 314 | 0 |
| china | shandong | whitmania pigra | species | 1 | 0 |
| china | yunnan | hirudinaria manillensis | species | 5 | 0 |
| costa rica | | barbronia weberi | species | 1 | 0 |
| ecuador | | haementeria lutzi | species | 1 | 0 |
| finland | | acanthobdella peledina | species | 19 | 0 |
| france | | glossiphonia complanata | species | 1 | 0 |
| france | | hirudo medicinalis | species | 6 | 0 |
| france | provence-alpes-cote d'azur region | erpobdella sp. t_p54 | species | 1 | 0 |
| france | provence-alpes-cote d'azur region | erpobdellidae environmental sample | species | 1 | 0 |
| france | provence-alpes-cote d'azur region | glossiphonia complanata | species | 1 | 0 |
| france | provence-alpes-cote d'azur region | glossiphoniidae environmental sample | species | 1 | 0 |
| france | provence-alpes-cote d'azur region | piscicola geometra | species | 1 | 0 |
| germany | | caspiobdella fadejewi | species | 2 | 0 |
| germany | | erpobdella octoculata | species | 2 | 0 |
| germany | | erpobdella testacea | species | 1 | 0 |
| germany | | glossiphonia complanata | species | 1 | 0 |
| germany | | piscicola geometra | species | 2 | 0 |
| germany | | piscicola sp. pt-2003 | species | 1 | 0 |
| germany | mecklenburg-vorpommern | dina lineata | species | 3 | 0 |
| germany | mecklenburg-vorpommern | erpobdella monostriata | species | 1 | 0 |
| germany | mecklenburg-vorpommern | erpobdella nigricollis | species | 1 | 0 |
| germany | mecklenburg-vorpommern | erpobdella testacea | species | 1 | 0 |
| germany | mecklenburg-vorpommern | erpobdella vilnensis | species | 1 | 0 |
| germany | mecklenburg-vorpommern | glossiphonia complanata | species | 1 | 0 |
| germany | north rhine-westphalia | dina lineata | species | 2 | 0 |
| germany | north rhine-westphalia | erpobdella nigricollis | species | 3 | 0 |
| germany | north rhine-westphalia | glossiphonia complanata | species | 2 | 0 |
| germany | north rhine-westphalia | helobdella stagnalis | species | 3 | 0 |
| germany | saxony-anhalt | erpobdella vilnensis | species | 4 | 0 |
| iceland | | helobdella stagnalis | species | 1 | 0 |
| india | | erpobdella octoculata | species | 1 | 0 |
| india | | glossiphonia complanata | species | 1 | 0 |
| india | | haemadipsa montana | species | 3 | 0 |
| india | | haemadipsa zeylanica | species | 1 | 0 |
| india | | myxobdella annandalei | species | 4 | 0 |
| india | | poecilobdella javanica | species | 6 | 0 |
| india | | poecilobdella manillensis | species | 8 | 0 |
| india | | whitmania laevis | species | 6 | 0 |
| india | arunachal pradesh | haemadipsa montana | species | 3 | 0 |
| india | national capital territory of delhi | hirudinaria bpling | species | 1 | 0 |
| indonesia | east java province | zeylanicobdella arugamensis | species | 16 | 0 |
| indonesia | west nusa tenggara province | zeylanicobdella arugamensis | species | 18 | 0 |
| iran | | dina lineata | species | 5 | 0 |
| iran | | dina lineata lineata | subspecies | 4 | 0 |
| iran | | erpobdella borisi | species | 24 | 0 |
| iran | | glossiphonia concolor | species | 2 | 0 |
| iran | | haemopis sanguisuga | species | 14 | 0 |
| iran | | helobdella stagnalis | species | 10 | 0 |
| iran | | hirudo medicinalis | species | 1 | 0 |
| iran | | hirudo orientalis | species | 59 | 0 |
| iran | | limnatis paluda | species | 8 | 0 |
| iran | | placobdella costata | species | 9 | 0 |
| iran | | trocheta haskonis | species | 1 | 0 |
| iran | | zeylanicobdella arugamensis | species | 3 | 0 |
| iraq | basra governorate | dina punctata | species | 1 | 0 |
| italy | | glossiphonia verrucata | species | 1 | 0 |
| italy | | myzobdella lugubris | species | 1 | 0 |
| italy | | placobdella costata | species | 3 | 0 |
| italy | | pontobdella muricata | species | 4 | 0 |
| italy | calabria region | placobdella costata | species | 2 | 0 |
| italy | sicily autonomous region | helobdella stagnalis | species | 5 | 0 |
| italy | sicily autonomous region | placobdella costata | species | 14 | 0 |
| japan | | haemadipsa japonica japonica | subspecies | 3 | 0 |
| japan | | haemadipsa rjukjuana | species | 1 | 0 |
| japan | | orobdella octonaria | species | 4 | 0 |
| japan | chiba prefecture | domanibdella palmyrae | species | 2 | 0 |
| japan | chiba prefecture | ozobranchus jantseanus | species | 7 | 0 |
| japan | ehime prefecture | orobdella kanaekoikeae | species | 66 | 0 |
| japan | ehime prefecture | orobdella nakahamai | species | 3 | 0 |
| japan | ehime prefecture | orobdella okanoi | species | 3 | 0 |
| japan | fukuoka prefecture | dinobdella ferox | species | 0 | 1 |
| japan | fukuoka prefecture | ozobranchus jantseanus | species | 1 | 0 |
| japan | gifu prefecture | orobdella whitmani | species | 9 | 0 |
| japan | gifu prefecture | ozobranchus jantseanus | species | 1 | 0 |
| japan | hiroshima prefecture | glossiphonia sp. | species | 1 | 0 |
| japan | hiroshima prefecture | hirudo nipponia | species | 1 | 0 |
| japan | hiroshima prefecture | odontobdella blanchardi | species | 2 | 0 |
| japan | hiroshima prefecture | orobdella naraharaetmagarum | species | 21 | 0 |
| japan | hiroshima prefecture | ozobranchus jantseanus | species | 11 | 0 |
| japan | hokkaido prefecture | orobdella kawakatsuorum | species | 21 | 0 |
| japan | hokkaido prefecture | orobdella koikei | species | 13 | 0 |
| japan | hyogo prefecture | orobdella yamaneae | species | 9 | 0 |
| japan | ibaraki prefecture | myxobdella sinanensis | species | 5 | 0 |
| japan | kagawa prefecture | ozobranchus jantseanus | species | 5 | 0 |
| japan | kagoshima prefecture | mimobdella japonica | species | 11 | 0 |
| japan | kagoshima prefecture | orobdella dolichopharynx | species | 11 | 0 |
| japan | kagoshima prefecture | orobdella mononoke | species | 10 | 0 |
| japan | kagoshima prefecture | tritetrabdella scandens | species | 1 | 0 |
| japan | kanagawa prefecture | haemadipsa japonica | species | 1 | 0 |
| japan | kanagawa prefecture | orobdella octonaria | species | 6 | 0 |
| japan | kochi prefecture | orobdella brachyepididymis | species | 3 | 0 |
| japan | kochi prefecture | orobdella nakahamai | species | 9 | 0 |
| japan | kochi prefecture | orobdella okanoi | species | 6 | 0 |
| japan | kumamoto prefecture | orobdella esulcata | species | 9 | 0 |
| japan | kyoto prefecture | odontobdella blanchardi | species | 9 | 0 |
| japan | kyoto prefecture | ozobranchus jantseanus | species | 5 | 0 |
| japan | nagano prefecture | erpobdella japonica | species | 9 | 0 |
| japan | nagano prefecture | orobdella ijimai | species | 2 | 0 |
| japan | nagano prefecture | orobdella masaakikuroiwai | species | 18 | 0 |
| japan | nagasaki prefecture | orobdella esulcata | species | 2 | 0 |
| japan | nagasaki prefecture | orobdella tsushimensis | species | 13 | 0 |
| japan | nagasaki prefecture | ozobranchus jantseanus | species | 5 | 0 |
| japan | okinawa prefecture | domanibdella palmyrae | species | 1 | 0 |
| japan | okinawa prefecture | mimobdella japonica | species | 10 | 0 |
| japan | okinawa prefecture | orobdella shimadae | species | 11 | 0 |
| japan | shiga prefecture | hirudo nipponia | species | 1 | 0 |
| japan | shiga prefecture | limnotrachelobdella sinensis | species | 3 | 0 |
| japan | shiga prefecture | orobdella whitmani | species | 2 | 0 |
| japan | shimane prefecture | ozobranchus jantseanus | species | 5 | 0 |
| japan | shizuoka prefecture | orobdella masaakikuroiwai | species | 3 | 0 |
| japan | tochigi prefecture | haemadipsa japonica | species | 13 | 0 |
| japan | tochigi prefecture | orobdella ijimai | species | 9 | 0 |
| japan | tokushima prefecture | orobdella brachyepididymis | species | 9 | 0 |
| japan | tokushima prefecture | ozobranchus jantseanus | species | 10 | 0 |
| japan | tokyo prefecture | domanibdella palmyrae | species | 24 | 0 |
| japan | tokyo prefecture | mimobdella japonica | species | 9 | 0 |
| japan | tokyo prefecture | orobdella masaakikuroiwai | species | 3 | 0 |
| japan | tokyo prefecture | orobdella octonaria | species | 6 | 0 |
| japan | tokyo prefecture | ozobranchus jantseanus | species | 3 | 0 |
| japan | tottori prefecture | orobdella naraharaetmagarum | species | 3 | 0 |
| kazakhstan | | hemiclepsis marginata | species | 1 | 0 |
| laos | | haemadipsa cavatuses | species | 5 | 0 |
| lithuania | utena municipality | hirudo medicinalis | species | 0 | 1 |
| macedonia | | dina cf. profunda tw-2010 | species | 4 | 0 |
| macedonia | | dina cf. svilesta tw-2010 | species | 1 | 0 |
| macedonia | | dina krilata | species | 8 | 0 |
| macedonia | | dina latestriata | species | 1 | 0 |
| macedonia | | dina lepinja | species | 8 | 0 |
| macedonia | | dina lineata | species | 3 | 0 |
| macedonia | | dina lyhnida | species | 13 | 0 |
| macedonia | | dina ohridana | species | 17 | 0 |
| macedonia | | dina sp. tw-2010 | species | 24 | 0 |
| macedonia | | dina svilesta | species | 1 | 0 |
| macedonia | | erpobdella octoculata | species | 2 | 0 |
| macedonia | ohrid municipality | dina sp. tw-2010 | species | 55 | 0 |
| macedonia | ohrid municipality | erpobdella sp. tw-2010 | species | 1 | 0 |
| madagascar | | chtonobdella fallax | species | 1 | 0 |
| madagascar | | chtonobdella niarchosorum | species | 1 | 0 |
| madagascar | | chtonobdella vagans | species | 14 | 0 |
| madagascar | | linta be | species | 3 | 0 |
| madagascar | | malagabdella fallax | species | 3 | 0 |
| madagascar | | malagabdella niarchosorum | species | 3 | 0 |
| madagascar | | malagabdella vagans | species | 3 | 0 |
| malaysia | | haemadipsa interrupta | species | 9 | 0 |
| malaysia | | hirudinaria javanica | species | 4 | 0 |
| malaysia | | hirudinaria manillensis | species | 4 | 0 |
| malaysia | | poecilobdella javanica | species | 1 | 0 |
| malaysia | | poecilobdella manillensis | species | 2 | 0 |
| malaysia | sabah | haemadipsa sp. bold:aco5628 | species | 1 | 0 |
| malaysia | sabah | tritetrabdella sp. 'kinabaluensis' ssp. 'inobongensis' | subspecies | 4 | 0 |
| malaysia | sabah | tritetrabdella sp. 'kinabaluensis' ssp. 'kinabaluensis' | subspecies | 2 | 0 |
| malaysia | sarawak | gastrostomobdella monticola | species | 15 | 0 |
| malaysia | terengganu | poecilobdella javanica | species | 2 | 0 |
| malaysia | terengganu | zeylanicobdella arugamensis | species | 11 | 0 |
| maldives | | dinobdella ferox | species | 0 | 1 |
| maldives | | ozobranchus margoi | species | 2 | 0 |
| mexico | | barbronia weberi | species | 2 | 0 |
| mexico | | diestecostoma magna | species | 3 | 0 |
| mexico | | diestecostoma mexicana | species | 3 | 0 |
| mexico | | diestecostoma trujillensis | species | 3 | 0 |
| mexico | | erpobdella mexicana | species | 15 | 0 |
| mexico | | erpobdella ochoterenai | species | 22 | 0 |
| mexico | | erpobdella triannulata | species | 2 | 0 |
| mexico | | haementeria acuecueyetzin | species | 2 | 0 |
| mexico | | haementeria officinalis | species | 1 | 0 |
| mexico | | helobdella atli | species | 4 | 0 |
| mexico | | helobdella elongata | species | 5 | 0 |
| mexico | | helobdella octatestisaca | species | 14 | 0 |
| mexico | | helobdella socimulcensis | species | 7 | 0 |
| mexico | | helobdella virginiae | species | 1 | 0 |
| mexico | | ozobranchus branchiatus | species | 1 | 0 |
| mexico | | pintobdella chiapasensis | species | 4 | 0 |
| mexico | | placobdella lamothei | species | 1 | 0 |
| mexico | | placobdella mexicana | species | 10 | 0 |
| mexico | | placobdella ringueleti | species | 3 | 0 |
| mexico | chiapas | erpobdella triannulata | species | 3 | 0 |
| mexico | chiapas | placobdella ringueleti | species | 3 | 0 |
| mexico | colima | haementeria lopezi | species | 7 | 0 |
| mexico | durango | haementeria officinalis | species | 2 | 0 |
| mexico | federal district | erpobdella mexicana | species | 3 | 0 |
| mexico | federal district | erpobdella ochoterenai | species | 3 | 0 |
| mexico | guanajuato | erpobdella mexicana | species | 4 | 0 |
| mexico | guanajuato | haementeria officinalis | species | 1 | 0 |
| mexico | jalisco | erpobdella ochoterenai | species | 209 | 0 |
| mexico | jalisco | haementeria lopezi | species | 2 | 0 |
| mexico | jalisco | hirudo medicinalis | species | 0 | 1 |
| mexico | mexico | placobdella lamothei | species | 6 | 0 |
| mexico | michoacan ocampo | haementeria officinalis | species | 4 | 0 |
| mexico | michoacan ocampo | placobdella lamothei | species | 3 | 0 |
| mexico | morelos | barbronia arcana | species | 7 | 0 |
| mexico | morelos | barbronia weberi | species | 1 | 0 |
| mexico | queretaro arteaga | haementeria officinalis | species | 3 | 0 |
| mexico | tabasco | erpobdella triannulata | species | 4 | 0 |
| mexico | tlaxcala | erpobdella mexicana | species | 6 | 0 |
| mexico | tlaxcala | erpobdella ochoterenai | species | 4 | 0 |
| mexico | veracruz-llave | erpobdella triannulata | species | 4 | 0 |
| mexico | veracruz-llave | haementeria acuecueyetzin | species | 23 | 0 |
| mexico | veracruz-llave | placobdella ringueleti | species | 2 | 0 |
| morocco | | limnatis nilotica | species | 1 | 0 |
| myanmar | tanintharyi division | haemadipsa sp. flmnh 4328 | species | 1 | 0 |
| myanmar | tanintharyi division | haemadipsa sp. flmnh 4330 | species | 1 | 0 |
| myanmar | tanintharyi division | haemadipsa sp. flmnh 4333 | species | 1 | 0 |
| namibia | | alboglossiphonia quadrata | species | 3 | 0 |
| nepal | | haemadipsa montana | species | 3 | 0 |
| nepal | | haemadipsa zeylanica agilis | subspecies | 3 | 0 |
| nepal | | haemadipsa zeylanica montivindicis | subspecies | 3 | 0 |
| new zealand | | helobdella europaea | species | 2 | 0 |
| norway | | acanthobdella peledina | species | 22 | 0 |
| norway | | helobdella stagnalis | species | 25 | 0 |
| norway | | johanssonia arctica | species | 2 | 0 |
| norway | finnmark county | johanssonia arctica | species | 0 | 2 |
| panama | | helobdella octatestisaca | species | 1 | 0 |
| panama | | placobdella parasitica | species | 2 | 0 |
| papua new guinea | | chtonobdella sp. doau | species | 1 | 0 |
| papua new guinea | | chtonobdella sp. pgsp | species | 4 | 0 |
| papua new guinea | | chtonobdella sp. png13 | species | 1 | 0 |
| papua new guinea | | domanibdella sp. n. eb-2010 | species | 3 | 0 |
| papua new guinea | | leiobdella sp. eb-2010 | species | 3 | 0 |
| papua new guinea | | planobdella sp. eb-2010 | species | 3 | 0 |
| peru | | haementeria tuberculifera | species | 2 | 0 |
| peru | | ozobranchus branchiatus | species | 2 | 0 |
| peru | | tyrannobdella rex | species | 4 | 0 |
| peru | loreto region | haementeria paraguayensis | species | 2 | 0 |
| philippines | | chtonobdella meyeri | species | 4 | 0 |
| philippines | | haemadipsa cf. zeylanica eb-2010 | species | 3 | 0 |
| philippines | | haemadipsa cochiniana | species | 3 | 0 |
| poland | | erpobdella octoculata | species | 1 | 0 |
| poland | | haemopis sanguisuga | species | 1 | 0 |
| poland | pomorskie province | piscicola geometra | species | 0 | 1 |
| portugal | | placobdella costata | species | 5 | 0 |
| romania | | erpobdella octoculata | species | 1 | 0 |
| russia | | alboglossiphonia papillosa | species | 3 | 0 |
| russia | | erpobdella sp. iak-2015a | species | 2 | 0 |
| russia | | glossiphonia baicalensis | species | 1 | 0 |
| russia | | glossiphonia sp. iak-2015a | species | 1 | 0 |
| russia | | helobdella stagnalis | species | 2 | 0 |
| russia | | hemiclepsis marginata | species | 2 | 0 |
| russia | | johanssonia arctica | species | 1 | 0 |
| russia | | piscicola sp. iak-2015a | species | 2 | 0 |
| russia | arkhangelsk oblast | erpobdella monostriata | species | 1 | 0 |
| russia | arkhangelsk oblast | glossiphonia complanata | species | 2 | 0 |
| russia | arkhangelsk oblast | glossiphonia concolor | species | 1 | 0 |
| russia | arkhangelsk oblast | helobdella stagnalis | species | 4 | 0 |
| russia | karelia republic | helobdella stagnalis | species | 2 | 0 |
| russia | kemerovo oblast | helobdella stagnalis | species | 1 | 0 |
| russia | khabarovsk krai | alboglossiphonia papillosa | species | 1 | 0 |
| russia | krasnoyarsk krai | helobdella stagnalis | species | 3 | 0 |
| russia | moscow city | helobdella stagnalis | species | 1 | 0 |
| russia | moscow oblast | glossiphonia complanata | species | 4 | 0 |
| russia | moscow oblast | glossiphonia concolor | species | 1 | 0 |
| russia | moscow oblast | helobdella stagnalis | species | 1 | 0 |
| russia | moscow oblast | hemiclepsis marginata | species | 4 | 0 |
| russia | moscow oblast | theromyzon tessulatum | species | 1 | 0 |
| russia | nenets autonomous okrug | helobdella stagnalis | species | 1 | 0 |
| russia | primorsky krai | alboglossiphonia lata | species | 1 | 0 |
| russia | sakha republic | alboglossiphonia papillosa | species | 8 | 0 |
| russia | samara oblast | helobdella stagnalis | species | 3 | 0 |
| russia | saratov oblast | helobdella stagnalis | species | 3 | 0 |
| russia | voronezh oblast | erpobdella monostriata | species | 4 | 0 |
| russia | yamalo-nenets autonomous okrug | glossiphonia complanata | species | 3 | 0 |
| russia | yamalo-nenets autonomous okrug | helobdella stagnalis | species | 1 | 0 |
| serbia | | haemopis sanguisuga | species | 2 | 0 |
| serbia | | hirudo verbana | species | 4 | 0 |
| seychelles | | chtonobdella seychellensis | species | 1 | 0 |
| seychelles | | idiobdella seychellensis | species | 3 | 0 |
| slovenia | | helobdella stagnalis | species | 1 | 0 |
| slovenia | | xerobdella lecomtei | species | 2 | 0 |
| south africa | | barbronia gwalagwalensis | species | 3 | 0 |
| south africa | | barbronia sp. eb-2004 | species | 3 | 0 |
| south africa | | batracobdelloides tricarinata | species | 3 | 0 |
| south africa | | helobdella cordobensis | species | 1 | 0 |
| south africa | | helobdella europaea | species | 3 | 0 |
| south africa | | helobdella octatestisaca | species | 2 | 0 |
| south africa | | placobdelloides jaegerskioeldi | species | 2 | 0 |
| south africa | gauteng province | oosthuizobdella garoui | species | 13 | 0 |
| south africa | mpumalanga province | placobdelloides jaegerskioeldi | species | 3 | 0 |
| south korea | | alboglossiphonia lata | species | 9 | 0 |
| south korea | | batracobdella paludosa | species | 1 | 0 |
| south korea | | erpobdella lineata | species | 1 | 0 |
| south korea | daejeon city | orobdella tsushimensis | species | 568 | 0 |
| south korea | gangwon province | orobdella tsushimensis | species | 3 | 0 |
| south korea | gwangju city | orobdella tsushimensis | species | 89 | 0 |
| south korea | incheon city | orobdella tsushimensis | species | 3 | 0 |
| south korea | jeju province | orobdella tsushimensis | species | 43 | 0 |
| south korea | seoul city | orobdella tsushimensis | species | 6 | 0 |
| spain | | helobdella europaea | species | 4 | 0 |
| spain | | helobdella octatestisaca | species | 1 | 0 |
| spain | andalusia | batracobdella algira | species | 1 | 0 |
| spain | basque country | hirudo verbana | species | 2 | 0 |
| spain | galicia | hirudo verbana | species | 6 | 0 |
| spain | valencia | dina punctata | species | 2 | 0 |
| sri lanka | | haemadipsa zeylanica | species | 3 | 0 |
| sweden | | acanthobdella peledina | species | 42 | 0 |
| sweden | | glossiphonia concolor | species | 3 | 0 |
| sweden | | haemopis sanguisuga | species | 1 | 0 |
| sweden | | helobdella stagnalis | species | 12 | 0 |
| sweden | | hirudo medicinalis | species | 5 | 0 |
| taiwan | | alboglossiphonia lata | species | 2 | 0 |
| taiwan | | dinobdella ferox | species | 3 | 1 |
| taiwan | | haemadipsa picta | species | 3 | 0 |
| taiwan | | haemadipsa rjukjuana | species | 27 | 0 |
| taiwan | | ozobranchus branchiatus | species | 6 | 0 |
| taiwan | | ozobranchus margoi | species | 3 | 0 |
| taiwan | | tritetrabdella taiwana | species | 7 | 0 |
| taiwan | | whitmania laevis | species | 3 | 0 |
| taiwan | taipei municipality | orobdella ketagalan | species | 13 | 0 |
| tajikistan | | helobdella stagnalis | species | 1 | 0 |
| thailand | | haemadipsa crenata | species | 3 | 0 |
| thailand | | haemadipsa interrupta | species | 6 | 0 |
| thailand | | haemadipsa sylvestris | species | 3 | 0 |
| thailand | | haemadipsa trimaculosa | species | 3 | 0 |
| thailand | | haemadipsa zeylanica subagilis | subspecies | 3 | 0 |
| thailand | | hirudinaria bpling | species | 10 | 0 |
| thailand | | placobdelloides siamensis | species | 3 | 0 |
| thailand | | poecilobdella javanica | species | 6 | 0 |
| thailand | | poecilobdella manillensis | species | 10 | 0 |
| thailand | | tritetrabdella scandens | species | 7 | 0 |
| thailand | nan province | tritetrabdella longiducta | species | 3 | 0 |
| tunisia | | placobdella costata | species | 8 | 0 |
| turkey | | helobdella stagnalis | species | 4 | 0 |
| turkey | | hirudo verbana | species | 18 | 0 |
| turkey | | limnatis nilotica | species | 1 | 0 |
| turkey | adiyaman province | hirudo sp. ns-2016 | species | 6 | 0 |
| turkey | ankara province | glossiphonia complanata | species | 232 | 0 |
| turkey | ankara province | glossiphonia concolor | species | 1 | 0 |
| turkey | ankara province | helobdella stagnalis | species | 68 | 0 |
| turkey | ankara province | hirudo verbana | species | 10 | 0 |
| turkey | ankara province | limnatis paluda | species | 16 | 0 |
| turkey | antalya province | placobdella costata | species | 9 | 0 |
| turkey | batman province | hirudo sp. ns-2016 | species | 5 | 0 |
| turkey | bursa province | hirudo verbana | species | 27 | 0 |
| turkey | diyarbakir province | placobdella costata | species | 16 | 0 |
| turkey | elazig province | hirudo verbana | species | 3 | 0 |
| turkey | gaziantep province | hirudo sp. ns-2016 | species | 8 | 0 |
| uganda | | batracobdelloides tricarinata | species | 7 | 0 |
| ukraine | | caspiobdella fadejewi | species | 2 | 0 |
| ukraine | | erpobdella vilnensis | species | 1 | 0 |
| ukraine | | glossiphonia concolor | species | 2 | 0 |
| ukraine | | helobdella europaea | species | 1 | 0 |
| ukraine | | hemiclepsis marginata | species | 1 | 0 |
| ukraine | | piscicola geometra | species | 2 | 0 |
| united kingdom | | glossiphonia complanata | species | 2 | 0 |
| united kingdom | | helobdella stagnalis | species | 1 | 0 |
| united kingdom | england | helobdella stagnalis | species | 4 | 0 |
| united states | | barbronia weberi formosana | subspecies | 3 | 0 |
| united states | | erpobdella microstoma | species | 3 | 0 |
| united states | | erpobdella obscura | species | 7 | 0 |
| united states | | erpobdella punctata | species | 5 | 0 |
| united states | | haemopis terrestris | species | 3 | 0 |
| united states | | helobdella elongata | species | 5 | 0 |
| united states | | helobdella lineata | species | 1 | 0 |
| united states | | helobdella modesta | species | 9 | 0 |
| united states | | helobdella robusta | species | 2 | 0 |
| united states | | helobdella sp. (serendipitous) ns-2017 | species | 1 | 0 |
| united states | | helobdella sp. 20118-1gh | species | 1 | 0 |
| united states | | helobdella sp. 3 ns-2017 | species | 2 | 0 |
| united states | | helobdella sp. 4 ns-2017 | species | 1 | 0 |
| united states | | helobdella sp. 5e-20224-1 | species | 1 | 0 |
| united states | | helobdella sp. 7 ns-2017 | species | 1 | 0 |
| united states | | helobdella sp. n. fpws2 ns-2017 | species | 1 | 0 |
| united states | | hirudo verbana | species | 1 | 0 |
| united states | | macrobdella decora | species | 2 | 0 |
| united states | | myzobdella lugubris | species | 3 | 0 |
| united states | | placobdella burresonae | species | 3 | 0 |
| united states | | placobdella kwetlumye | species | 1 | 0 |
| united states | | placobdella montifera | species | 1 | 0 |
| united states | | placobdella nuchalis | species | 1 | 0 |
| united states | | placobdella ornata | species | 2 | 0 |
| united states | | placobdella papillifera | species | 1 | 0 |
| united states | | placobdella rugosa | species | 1 | 0 |
| united states | alaska | acanthobdella peledina | species | 7 | 0 |
| united states | arizona | helobdella blinni | species | 3 | 0 |
| united states | arizona | helobdella modesta | species | 283607 | 0 |
| united states | arizona | helobdella sp. rkbp-2014 | species | 1 | 0 |
| united states | arkansas | placobdella pediculata | species | 1 | 0 |
| united states | california | austrobdella californiana | species | 6 | 0 |
| united states | california | helobdella aff. robusta casa 1 | species | 1 | 0 |
| united states | california | helobdella europaea | species | 13 | 0 |
| united states | california | helobdella robusta | species | 3 | 0 |
| united states | california | helobdella triserialis | species | 1 | 0 |
| united states | connecticut | helobdella modesta | species | 13 | 0 |
| united states | connecticut | placobdella ali | species | 2 | 0 |
| united states | connecticut | placobdella ornata | species | 5 | 0 |
| united states | connecticut | placobdella papillifera | species | 5 | 0 |
| united states | florida | ozobranchus branchiatus | species | 57 | 0 |
| united states | florida | ozobranchus margoi | species | 25 | 0 |
| united states | hawaii | alboglossiphonia weberi | species | 3 | 0 |
| united states | idaho | placobdella kwetlumye | species | 4 | 0 |
| united states | louisiana | macrobdella ditetra | species | 9 | 0 |
| united states | louisiana | philobdella gracilis | species | 4 | 0 |
| united states | louisiana | placobdella multilineata | species | 4 | 0 |
| united states | maryland | calliobdella vivida | species | 3 | 0 |
| united states | maryland | myzobdella lugubris | species | 2 | 0 |
| united states | maryland | placobdella sp. 3 ddc-2017 | species | 3 | 0 |
| united states | massachusetts | helobdella lineata | species | 1 | 0 |
| united states | massachusetts | helobdella modesta | species | 1 | 0 |
| united states | massachusetts | helobdella papillata | species | 1 | 0 |
| united states | massachusetts | placobdella ali | species | 7 | 0 |
| united states | massachusetts | placobdella hollensis | species | 7 | 0 |
| united states | massachusetts | placobdella ornata | species | 4 | 0 |
| united states | michigan | glossiphonia elegans | species | 2 | 0 |
| united states | michigan | helobdella elongata | species | 1 | 0 |
| united states | michigan | helobdella fusca | species | 1 | 0 |
| united states | michigan | helobdella lineata | species | 1 | 0 |
| united states | michigan | helobdella papillata | species | 3 | 0 |
| united states | michigan | helobdella transversa | species | 1 | 0 |
| united states | michigan | placobdella montifera | species | 1 | 0 |
| united states | michigan | placobdella pediculata | species | 1 | 0 |
| united states | michigan | placobdella transluscens | species | 1 | 0 |
| united states | minnesota | erpobdella microstoma | species | 1 | 0 |
| united states | minnesota | placobdella parasitica | species | 5 | 0 |
| united states | minnesota | placobdella pediculata | species | 1 | 0 |
| united states | mississippi | helobdella europaea | species | 1 | 0 |
| united states | mississippi | placobdella multilineata | species | 1 | 0 |
| united states | mississippi | placobdella siddalli | species | 1 | 0 |
| united states | missouri | haemopis terrestris | species | 3 | 0 |
| united states | missouri | macrobdella diplotertia | species | 3 | 0 |
| united states | missouri | placobdella cryptobranchii | species | 21 | 0 |
| united states | nebraska | placobdella picta | species | 4 | 0 |
| united states | nebraska | placobdella rugosa | species | 4 | 0 |
| united states | nebraska | placobdella transluscens | species | 1 | 0 |
| united states | new hampshire | placobdella papillifera | species | 1 | 0 |
| united states | new jersey | erpobdella punctata | species | 1 | 0 |
| united states | new jersey | haemopis marmorata | species | 3 | 0 |
| united states | new jersey | haemopis sp. ds-2009 | species | 7 | 0 |
| united states | new jersey | placobdella ali | species | 2 | 0 |
| united states | new jersey | placobdella ornata | species | 8 | 0 |
| united states | new jersey | placobdella papillifera | species | 3 | 0 |
| united states | new jersey | placobdella phalera | species | 4 | 0 |
| united states | new york | erpobdella sp. dnas-159-145130 | species | 1 | 0 |
| united states | new york | helobdella aff. robusta nyta | species | 1 | 0 |
| united states | new york | helobdella modesta | species | 2 | 0 |
| united states | new york | placobdella ali | species | 8 | 0 |
| united states | new york | placobdella nuchalis | species | 12 | 0 |
| united states | new york | placobdella papillifera | species | 8 | 0 |
| united states | new york | placobdella phalera | species | 4 | 0 |
| united states | new york | placobdella sp. 2 ddc-2017 | species | 4 | 0 |
| united states | north carolina | branchellion torpedinis | species | 1 | 0 |
| united states | north carolina | placobdella hollensis | species | 2 | 0 |
| united states | ohio | haemopis terrestris | species | 3 | 0 |
| united states | ohio | helobdella modesta | species | 2 | 0 |
| united states | ohio | helobdella stagnalis | species | 1 | 0 |
| united states | oklahoma | placobdella multilineata | species | 5 | 0 |
| united states | oklahoma | placobdella papillifera | species | 1 | 0 |
| united states | oregon | helobdella bowermani | species | 3 | 0 |
| united states | oregon | placobdella sophieae | species | 2 | 0 |
| united states | pennsylvania | erpobdella punctata | species | 2 | 0 |
| united states | pennsylvania | placobdella papillifera | species | 4 | 0 |
| united states | pennsylvania | placobdella parasitica | species | 4 | 0 |
| united states | pennsylvania | placobdella phalera | species | 4 | 0 |
| united states | rhode island | placobdella ali | species | 1 | 0 |
| united states | rhode island | placobdella hollensis | species | 1 | 0 |
| united states | south carolina | philobdella floridana | species | 13 | 0 |
| united states | tennessee | placobdella papillifera | species | 1 | 0 |
| united states | tennessee | placobdella phalera | species | 3 | 0 |
| united states | texas | erpobdella costata | species | 3 | 0 |
| united states | texas | helobdella aff. robusta txau1 | species | 1 | 0 |
| united states | texas | helobdella austinensis | species | 1 | 0 |
| united states | texas | helobdella octatestisaca | species | 1 | 0 |
| united states | texas | helobdella robusta | species | 9 | 0 |
| united states | texas | placobdella parasitica | species | 1 | 0 |
| united states | virginia | helobdella lineata | species | 1 | 0 |
| united states | virginia | placobdella phalera | species | 4 | 0 |
| united states | virginia | placobdella sp. cih-2014 | species | 4 | 0 |
| united states | washington | erpobdella annulata | species | 3 | 0 |
| united states | washington | placobdella kwetlumye | species | 4 | 0 |
| united states | washington | placobdella montifera | species | 4 | 0 |
| united states | washington | placobdella sophieae | species | 8 | 0 |
| uruguay | | haementeria depressa | species | 3 | 0 |
| uruguay | | haementeria molesta | species | 1 | 0 |
| uruguay | | haementeria tuberculifera | species | 1 | 0 |
| uruguay | colonia department | haementeria depressa | species | 3 | 0 |
| uruguay | flores department | haementeria depressa | species | 4 | 0 |
| uruguay | maldonado department | haementeria depressa | species | 7 | 0 |
| uzbekistan | | erpobdella octoculata | species | 3 | 0 |
| uzbekistan | | helobdella stagnalis | species | 1 | 0 |
| uzbekistan | | limnatis paluda | species | 4 | 0 |
| vietnam | kon tum province | salifa motokawai | species | 9 | 0 |
| vietnam | son la province | tritetrabdella longiducta | species | 3 | 0 |