| antarctica | | litoditis marina | species | 35 | 0 |
| antarctica | | pellioditis sp. fun120 | species | 1 | 0 |
| argentina | buenos aires province | caenorhabditis elegans | species | 1 | 0 |
| argentina | mendoza province | caenorhabditis elegans | species | 0 | 1 |
| argentina | misiones province | oscheius tipulae | species | 1 | 0 |
| australia | | rhabditis sp. ok-2011 | species | 3 | 0 |
| australia | new south wales | caenorhabditis elegans | species | 0 | 1 |
| australia | new south wales | poikilolaimus oxycercus | species | 1 | 0 |
| australia | queensland | caenorhabditis elegans | species | 9 | 1 |
| australia | south australia | caenorhabditis elegans | species | 9 | 0 |
| australia | south australia | oscheius necromenus | species | 1 | 0 |
| belgium | flemish region | phasmarhabditis hermaphrodita | species | 4 | 0 |
| brazil | | oscheius tipulae | species | 4 | 0 |
| brazil | | rhabditis blumi | species | 5 | 0 |
| brazil | parana | oscheius tipulae | species | 1 | 0 |
| brazil | rio de janeiro | caenorhabditis elegans | species | 0 | 1 |
| brazil | rio de janeiro | teratorhabditis palmarum | species | 0 | 1 |
| brazil | rio grande do sul | oscheius tipulae | species | 1 | 0 |
| brazil | sao paulo | oscheius tipulae | species | 8 | 0 |
| brazil | sao paulo | rhabditis rainai | species | 1 | 0 |
| canada | british columbia | caenorhabditis elegans | species | 3 | 0 |
| canada | british columbia | caenorhabditis remanei | species | 8 | 0 |
| canada | british columbia | rhabditis sp. bc7735 | species | 1 | 0 |
| canada | ontario | caenorhabditis elegans | species | 0 | 1 |
| canada | ontario | caenorhabditis remanei | species | 130 | 0 |
| chile | | cuticularia sp. ps-2006 | species | 1 | 0 |
| china | | mesorhabditis spiculigera | species | 5 | 0 |
| china | | oscheius chongmingensis | species | 17 | 0 |
| china | | oscheius microvilli | species | 2 | 0 |
| china | beijing | caenorhabditis elegans | species | 3 | 0 |
| china | guangdong | caenorhabditis elegans | species | 0 | 1 |
| china | henan | caenorhabditis elegans | species | 0 | 1 |
| china | hubei | caenorhabditis latens | species | 1438 | 0 |
| china | hunan | caenorhabditis elegans | species | 0 | 1 |
| china | inner mongolia | caenorhabditis elegans | species | 0 | 1 |
| china | jiangsu | caenorhabditis elegans | species | 0 | 1 |
| china | shanxi | caenorhabditis elegans | species | 0 | 1 |
| colombia | | oscheius myriophilus | species | 10 | 0 |
| colombia | | rhabditis blumi | species | 1 | 0 |
| colombia | antioquia department | oscheius tipulae | species | 1 | 0 |
| colombia | magdalena department | caenorhabditis elegans | species | 0 | 1 |
| colombia | santander department | caenorhabditis briggsae | species | 2 | 0 |
| costa rica | | sclerorhabditis sp. jm-2016 | species | 7 | 0 |
| czech republic | | mesorhabditis spiculigera | species | 1 | 0 |
| czech republic | | oscheius myriophilus | species | 1 | 0 |
| czech republic | | parasitorhabditis obtusa | species | 2 | 0 |
| czech republic | | phasmarhabditis sp. 185 | species | 1 | 0 |
| czech republic | | phasmarhabditis sp. ndv | species | 1 | 0 |
| czech republic | | phasmarhabditis sp. vp-2016a | species | 9 | 0 |
| ecuador | galapagos province | caenorhabditis elegans | species | 0 | 1 |
| egypt | | caenorhabditis elegans | species | 2 | 0 |
| egypt | | rhabditella axei | species | 2 | 0 |
| france | | caenorhabditis elegans | species | 5 | 0 |
| france | | mesorhabditis spiculigera | species | 3 | 0 |
| france | | oscheius sp. fvv-2 | species | 3 | 0 |
| france | | oscheius tipulae | species | 3 | 0 |
| france | aquitaine region | caenorhabditis elegans | species | 18 | 0 |
| france | ile-de-france region | caenorhabditis elegans | species | 7 | 1 |
| french polynesia | | caenorhabditis elegans | species | 0 | 1 |
| georgia | | pelodera strongyloides | species | 5 | 0 |
| germany | | caenorhabditis elegans | species | 3 | 0 |
| germany | | caenorhabditis remanei | species | 68 | 0 |
| germany | | mesorhabditis spiculigera | species | 2 | 0 |
| germany | | pellioditis sp. vs-2014 | species | 2 | 0 |
| germany | | rhabditis brassicae | species | 2 | 0 |
| germany | hesse | caenorhabditis elegans | species | 2 | 0 |
| germany | north rhine-westphalia | poikilolaimus sp. bi-lsu-273 | species | 1 | 0 |
| germany | north rhine-westphalia | poikilolaimus sp. bi-lsu-274 | species | 1 | 0 |
| germany | north rhine-westphalia | poikilolaimus sp. bi-lsu-275 | species | 1 | 0 |
| germany | north rhine-westphalia | poikilolaimus sp. bi-lsu-276 | species | 1 | 0 |
| germany | north rhine-westphalia | poikilolaimus sp. bi-lsu-277 | species | 1 | 0 |
| germany | north rhine-westphalia | poikilolaimus sp. bi-lsu-278 | species | 1 | 0 |
| germany | north rhine-westphalia | poikilolaimus sp. bi-lsu-279 | species | 1 | 0 |
| germany | north rhine-westphalia | poikilolaimus sp. bi-lsu-280 | species | 1 | 0 |
| germany | north rhine-westphalia | poikilolaimus sp. bi-lsu-281 | species | 1 | 0 |
| germany | north rhine-westphalia | poikilolaimus sp. bi-lsu-282 | species | 1 | 0 |
| germany | north rhine-westphalia | poikilolaimus sp. bi-lsu-283 | species | 1 | 0 |
| germany | saxony | poikilolaimus oxycercus | species | 10 | 0 |
| ghana | ashanti region | caenorhabditis elegans | species | 0 | 1 |
| hong kong | | caenorhabditis elegans | species | 0 | 1 |
| india | | distolabrellus veechi | species | 13 | 0 |
| india | | metarhabditis amsactae | species | 8 | 0 |
| india | | oscheius insectivora | species | 1 | 0 |
| india | | oscheius sp. | species | 2 | 0 |
| india | | rhabditis sp. b cm-2010 | species | 1 | 0 |
| india | | rhabditis sp. hy cm-2010 | species | 1 | 0 |
| india | | rhabditis sp. k cm-2010 | species | 1 | 0 |
| india | | rhabditis sp. n cm-2010 | species | 1 | 0 |
| india | andhra pradesh | metarhabditis amsactae | species | 3 | 0 |
| india | assam | oscheius sp. | species | 2 | 0 |
| india | gujarat | caenorhabditis briggsae | species | 1 | 0 |
| india | gujarat | caenorhabditis elegans | species | 0 | 1 |
| india | jammu and kashmir | mesorhabditis sp. vss-2017 | species | 3 | 0 |
| india | jammu and kashmir | rhabditis sp. a vss-2017 | species | 1 | 0 |
| india | jammu and kashmir | rhabditis sp. b vss-2017 | species | 1 | 0 |
| india | jammu and kashmir | rhabditis sp. d vss-2017 | species | 1 | 0 |
| india | jammu and kashmir | rhabditis sp. f vss-2017 | species | 1 | 0 |
| india | jammu and kashmir | rhabditis sp. g vss-2017 | species | 1 | 0 |
| india | jammu and kashmir | rhabditis sp. h vss-2017 | species | 1 | 0 |
| india | jammu and kashmir | rhabditis sp. i vss-2017 | species | 1 | 0 |
| india | jammu and kashmir | rhabditis sp. j vss-2017 | species | 1 | 0 |
| india | jammu and kashmir | rhabditis sp. k vss-2017 | species | 1 | 0 |
| india | jammu and kashmir | teratorhabditis sp. vss-2017 | species | 1 | 0 |
| india | tamil nadu | caenorhabditis elegans | species | 1 | 1 |
| india | uttar pradesh | teratorhabditis synpapillata | species | 2 | 0 |
| indonesia | | teratorhabditis synpapillata | species | 1 | 0 |
| iran | | oscheius chongmingensis | species | 4 | 0 |
| iran | | oscheius tipulae | species | 2 | 0 |
| iran | | pelodera strongyloides | species | 1 | 0 |
| iran | | rhabditis sp. | species | 3 | 0 |
| israel | | parasitorhabditis obtusa | species | 2 | 0 |
| israel | | teratorhabditis synpapillata | species | 2 | 0 |
| italy | | mesorhabditis spiculigera | species | 3 | 0 |
| italy | | phasmarhabditis sp. vp-2016a | species | 7 | 0 |
| italy | | rhabditella axei | species | 1 | 0 |
| italy | | rhabditis terricola | species | 1 | 0 |
| italy | apulia region | oscheius tipulae | species | 28 | 0 |
| italy | apulia region | rhabditidae sp. 1 jal-2013 | species | 1 | 0 |
| italy | apulia region | teratorhabditis synpapillata | species | 13 | 0 |
| italy | sicily autonomous region | oscheius tipulae | species | 3 | 0 |
| italy | tuscany region | oscheius sp. as-2017 | species | 2 | 0 |
| italy | tuscany region | oscheius sp. fdl-2014 | species | 2 | 0 |
| italy | tuscany region | oscheius tipulae | species | 5 | 0 |
| italy | tuscany region | rhabditis terricola | species | 2 | 0 |
| japan | | caenorhabditis elegans | species | 1 | 0 |
| japan | | oscheius sp. n2 | species | 1 | 0 |
| japan | | protorhabditis sp. vs-2014 | species | 2 | 0 |
| japan | aichi prefecture | pellioditis sp. gst17 | species | 1 | 0 |
| japan | aichi prefecture | pellioditis sp. gst45 | species | 1 | 0 |
| japan | aomori prefecture | rhabditidae environmental sample | species | 8 | 0 |
| japan | chiba prefecture | caenorhabditis elegans | species | 1 | 0 |
| japan | chiba prefecture | mesorhabditis environmental sample | species | 3 | 0 |
| japan | ibaraki prefecture | distolabrellus veechi | species | 3 | 0 |
| japan | ibaraki prefecture | rhabditis sp. 1 mk-2017 | species | 4 | 0 |
| japan | ibaraki prefecture | rhabditis sp. 2 mk-2017 | species | 1 | 0 |
| japan | ibaraki prefecture | rhabditis sp. 3 mk-2017 | species | 1 | 0 |
| japan | ibaraki prefecture | rhabditis sp. 4 mk-2017 | species | 3 | 0 |
| japan | ibaraki prefecture | rhabditis sp. 5 mk-2017 | species | 1 | 0 |
| japan | kagawa prefecture | caenorhabditis elegans | species | 3 | 0 |
| japan | kagoshima prefecture | teratorhabditis synpapillata | species | 2 | 0 |
| japan | okayama prefecture | caenorhabditis briggsae | species | 1 | 0 |
| japan | okinawa prefecture | caenorhabditis elegans | species | 0 | 1 |
| japan | okinawa prefecture | caenorhabditis inopinata | species | 6 | 0 |
| japan | tokyo prefecture | heterorhabditidoides rugaoensis | species | 1 | 0 |
| kenya | | mesorhabditis longespiculosa | species | 1 | 0 |
| lebanon | | heterorhabditidoides sp. bra6 | species | 1 | 0 |
| mexico | | mesorhabditis sp. wb-2009 | species | 1 | 0 |
| mexico | | oscheius myriophilus | species | 1 | 0 |
| mexico | guanajuato | rhabditoides regina | species | 1 | 0 |
| netherlands | | litoditis aff. marina pmi | species | 2 | 0 |
| netherlands | | litoditis aff. marina pmii | species | 2 | 0 |
| netherlands | | litoditis aff. marina pmiii | species | 2 | 0 |
| netherlands | | litoditis aff. marina pmiv | species | 2 | 0 |
| new caledonia | | caenorhabditis elegans | species | 1 | 1 |
| pakistan | | oscheius sp. pak.s.n.1 | species | 1 | 0 |
| pakistan | | oscheius sp. pak.s.n.10 | species | 1 | 0 |
| pakistan | | oscheius sp. pak.s.n.17 | species | 1 | 0 |
| pakistan | | oscheius sp. pak.s.n.2 | species | 1 | 0 |
| pakistan | | oscheius sp. pak.s.n.24 | species | 1 | 0 |
| pakistan | | oscheius sp. pak.s.n.5 | species | 1 | 0 |
| pakistan | | oscheius sp. pak.s.n.6 | species | 1 | 0 |
| philippines | | metarhabditis amsactae | species | 2 | 0 |
| portugal | | mesorhabditis spiculigera | species | 1 | 0 |
| portugal | madeira autonomous region | caenorhabditis elegans | species | 2 | 0 |
| puerto rico | | caenorhabditis elegans | species | 0 | 1 |
| reunion | | oscheius myriophilus | species | 3 | 0 |
| russia | astrakhan oblast | caenorhabditis elegans | species | 0 | 1 |
| saint helena | | caenorhabditis elegans | species | 0 | 1 |
| slovakia | | mesorhabditis sp. wb-2009 | species | 1 | 0 |
| slovakia | | parasitorhabditis obtusa | species | 2 | 0 |
| slovakia | | rhabditis sp. df5059 | species | 1 | 0 |
| slovakia | | rhabditis sp. ra5 | species | 10 | 0 |
| south africa | | caenorhabditis briggsae | species | 5 | 0 |
| south africa | | caenorhabditis elegans | species | 8 | 0 |
| south africa | | oscheius sp. mcb | species | 1 | 0 |
| south africa | | oscheius sp. tel-2014 | species | 73789 | 0 |
| south africa | | phasmarhabditis sp. sa1 | species | 1 | 0 |
| south africa | | phasmarhabditis sp. sa2 | species | 2 | 0 |
| south africa | | phasmarhabditis sp. sa3 | species | 3 | 0 |
| south africa | | phasmarhabditis sp. sa4 | species | 4 | 0 |
| south africa | | poikilolaimus oxycercus | species | 2 | 0 |
| south africa | | poikilolaimus regenfussi | species | 2 | 0 |
| south africa | north-west province | oscheius sp. mcb | species | 3 | 0 |
| south africa | the western cape province | caenorhabditis elegans | species | 0 | 1 |
| south africa | the western cape province | oscheius microvilli | species | 1 | 0 |
| south korea | | rhabditis rainai | species | 1 | 0 |
| spain | | mesorhabditis spiculigera | species | 1 | 0 |
| spain | | parasitorhabditis obtusa | species | 2 | 0 |
| sweden | | parasitorhabditis obtusa | species | 1 | 0 |
| sweden | | rhabditis cf. terricola jh-2004 | species | 2 | 0 |
| sweden | | rhabditis sp. df5059 | species | 2 | 0 |
| sweden | | rhabditis sp. ra5 | species | 5 | 0 |
| switzerland | | caenorhabditis elegans | species | 2 | 0 |
| switzerland | | oscheius sp. 67_p20 | species | 2 | 0 |
| switzerland | | oscheius sp. 68_p29 | species | 1 | 0 |
| switzerland | | oscheius sp. 69_p20 | species | 2 | 0 |
| switzerland | | oscheius tipulae | species | 1 | 0 |
| taiwan | | caenorhabditis briggsae | species | 2 | 0 |
| taiwan | | caenorhabditis elegans | species | 0 | 3 |
| taiwan | | parasitorhabditis obtusa | species | 1 | 0 |
| taiwan | | pelodera strongyloides | species | 0 | 1 |
| taiwan | | poikilolaimus sp. nktw | species | 2 | 0 |
| turkey | | oscheius tipulae | species | 1 | 0 |
| united kingdom | | caenorhabditis elegans | species | 8 | 0 |
| united kingdom | england | caenorhabditis elegans | species | 1667 | 7 |
| united kingdom | england | oscheius sp. seqzsl_5 | species | 1 | 0 |
| united kingdom | england | pelodera strongyloides | species | 0 | 1 |
| united kingdom | england | poikilolaimus sp. seqbet_1 | species | 1 | 0 |
| united kingdom | england | poikilolaimus sp. seqzsl_6 | species | 1 | 0 |
| united kingdom | scotland | caenorhabditis elegans | species | 0 | 1 |
| united states | | mesorhabditis spiculigera | species | 1 | 0 |
| united states | | oscheius dolichura | species | 2 | 0 |
| united states | | phasmarhabditis hermaphrodita | species | 15 | 0 |
| united states | | phasmarhabditis sp. 1 itdl-2014 | species | 7 | 0 |
| united states | | phasmarhabditis sp. 2 itdl-2014 | species | 3 | 0 |
| united states | | poikilolaimus floridensis | species | 1 | 0 |
| united states | | poikilolaimus regenfussi kw-1c-12 | subspecies | 1 | 0 |
| united states | alabama | caenorhabditis elegans | species | 0 | 1 |
| united states | california | caenorhabditis elegans | species | 55 | 5 |
| united states | california | oscheius myriophilus | species | 1 | 0 |
| united states | california | oscheius sp. rlh-2013 | species | 1 | 0 |
| united states | california | pelodera strongyloides | species | 0 | 1 |
| united states | florida | caenorhabditis elegans | species | 0 | 1 |
| united states | florida | poikilolaimus floridensis | species | 2 | 0 |
| united states | hawaii | caenorhabditis briggsae | species | 1 | 0 |
| united states | hawaii | caenorhabditis elegans | species | 11 | 3 |
| united states | iowa | pelodera strongyloides | species | 0 | 1 |
| united states | kansas | mesorhabditis sp. mr1 | species | 1 | 0 |
| united states | kansas | oscheius sp. fvv-2 | species | 1 | 0 |
| united states | kansas | oscheius tipulae | species | 1 | 0 |
| united states | kansas | rhabditis sp. ra5 | species | 1 | 0 |
| united states | massachusetts | caenorhabditis elegans | species | 2 | 0 |
| united states | michigan | caenorhabditis elegans | species | 0 | 1 |
| united states | minnesota | rhabditis rainai | species | 1 | 0 |
| united states | nebraska | oscheius sp. fdl-2014 | species | 1 | 0 |
| united states | new york | caenorhabditis elegans | species | 0 | 1 |
| united states | new york | caenorhabditis remanei | species | 1166 | 0 |
| united states | north carolina | oscheius carolinensis | species | 3 | 0 |
| united states | ohio | caenorhabditis remanei | species | 638 | 0 |
| united states | oregon | caenorhabditis elegans | species | 0 | 1 |
| united states | texas | pelodera strongyloides | species | 0 | 1 |
| united states | virginia | rhabditinae sp. 1 tmg-2010 | species | 1 | 0 |
| united states | virginia | rhabditinae sp. 2 tmg-2010 | species | 1 | 0 |
| united states | washington | caenorhabditis elegans | species | 0 | 1 |
| united states | wisconsin | caenorhabditis elegans | species | 7 | 0 |