List of nematode families

List of Nematoda has 25,000 recorded species from the Nematode phylum. There are estimated to be a million.^[1]

Class Chromadorea

Subclass Chromadoria

Order Araeolaimida
- Superfamily Axonolaimoidea Filipjev, 1918
  - Axonolaimidae Filipjev, 1918
  - Bodonematidae Jensen, 1991
  - Comesomatidae Filipjev, 1918
  - Coninckiidae Lorenzen, 1981
  - Diplopeltidae Filipjev, 1918
Order Ascaridida
Order Chromadorida
- Suborder Chromadorina
  - Superfamily Chromadoroidea Filipjev, 1917
    - Achromadoridae Gerlach & Riemann, 1973
    - Chromadoridae Filipjev, 1917
    - Cyatholaimidae Filipjev, 1918
    - Ethmolaimidae Filipjev & Schuurmans Stekhoven, 1941
    - Neotonchidae Wieser & Hopper, 1966
    - Selachinematidae Cobb, 1915
Order Desmodorida
- Suborder Desmodorina
  - Superfamily Desmodoroidea Filipjev, 1922
    - Desmodoridae Filipjev, 1922
    - Draconematidae Filipjev, 1918
    - Epsilonematidae Steiner, 1927
  - Superfamily Microlaimoidea Micoletzky, 1922
    - Aponchiidae Gerlach, 1963
    - Microlaimidae Micoletzky, 1922
    - Monoposthiidae Filipjev, 1934
Order Desmoscolecida
- Suborder Desmoscolecina
  - Superfamily Desmoscolecoidea Shipley, 1896
    - Cyartonematidae Tchesunov, 1990
    - Desmoscolecidae Shipley, 1896
    - †Eophasmidae Poinar, 2011^[2]
    - Meyliidae de Coninck, 1965
Order Monhysterida
- Suborder Linhomoeina
  - Superfamily Siphonolaimoidea Filipjev, 1918
    - Fusivermidae Tchesunov, 1996
    - Linhomoeidae Filipjev, 1922
    - Siphonolaimidae Filipjev, 1918
- Suborder Monhysterina
  - Superfamily Monhysteroidea Filipjev, 1929
    - Monhysteridae de Man, 1876
  - Superfamily Sphaerolaimoidea Filipjev, 1918
    - Sphaerolaimidae Filipjev, 1918
    - Xyalidae Chitwood, 1951
Order Plectida
- Suborder Ceramonematina
  - Superfamily Ceramonematoidea Cobb, 1933
    - Ceramonematidae Cobb, 1933
    - Diplopeltoididae Tchesunov, 1990
    - Paramicrolaimidae Lorenzen, 1981
    - Tarvaiidae Lorenzen, 1981
    - Tubolaimoididae Lorenzen, 1981
- Incertae sedis
  - Superfamily Haliplectoidea Chitwood, 1951
    - Haliplectidae Chitwood, 1951
  - Aegialoalaimidae Lorenzen, 1981
  - Aulolaimidae Jairajpuri & Hopper, 1968
- Suborder Plectina
  - Superfamily Camacolaimoidea Micoletzky, 1924
    - Camacolaimidae Micoletzky, 1924
    - Rhadinematidae Lorenzen, 1981
  - Superfamily Leptolaimoidea Örley, 1880
    - Aphanolaimidae Chitwood, 1936
    - Leptolaimidae Örley, 1880
  - Superfamily Ohridioidea (Andrassy, 1976)
    - Creagrocercidae Baylis, 1943
    - Ohridiidae Andrássy, 1976
  - Superfamily Plectoidea Örley, 1880
    - Chronogastridae Gagarin, 1975
    - Metateratocephalidae Eroshenko, 1973
    - Plectidae Örley, 1880
Order Rhabditida
- Incertae sedis
  - Brevibuccidae Paramonov, 1956
  - Chambersiellidae Thorne, 1937
  - Teratocephalidae Andrassy, 1958
- Suborder Myolaimina
  - Superfamily Myolaimoidea Andrassy, 1958
    - Myolaimidae Andrassy, 1958
- Suborder Rhabditina
  - Infraorder Bunonematomorpha
    - Superfamily Bunonematoidea Micoletzky, 1922
      - Bunonematidae Micoletzky, 1922
      - Pterygorhabditidae Goodey, 1963
  - Infraorder Diplogasteromorpha
    - Superfamily Cylindrocorporoidea Goodey, 1939
      - Cylindrocorporidae Goodey, 1939
    - Superfamily Diplogasteroidea Micoletzky, 1922
      - Cephalobiidae Filipjev, 1934
      - Diplogasteridae Micoletzky, 1922
      - Diplogasteroididae Filipjev & Schuurmans Stekhoven, 1941
      - Mehdinematidae Farooqui, 1967
      - Neodiplogasteridae Paramonov, 1952
      - Pseudodiplogasteroididae Körner, 1954
    - Superfamily Odontopharyngoidea Micoletzky, 1922
      - Odontopharyngidae Micoletzky, 1922
  - Infraorder Rhabditomorpha
    - Incertae sedis
      - Agfidae Dougherty, 1955
      - Carabonematidae Stammer & Wachek, 1952
    - Superfamily Mesorhabditoidea Andrassy, 1976
      - Mesorhabditidae Andrassy, 1976
      - Peloderidae Andrassy, 1976
    - Superfamily Rhabditoidea Örley, 1880
      - Diploscapteridae Micoletzky, 1922
      - Rhabditidae Örley, 1880
    - Superfamily Strongyloidea Baird, 1853
      - Ancylostomatidae Looss, 1905
      - Diaphanocephalidae Travassos, 1920
      - Heligmosomidae Cram, 1927
      - Heterorhabditidae Poinar, 1976
      - Metastrongylidae Diesing, 1851
      - Moleinidae Durette-Desset & Chabaud, 1977
      - Strongylidae Baird, 1853
      - Trichostrongylidae Leiper, 1912
- Suborder Spirurina
  - Infraorder Ascaridomorpha
    - Superfamily Ascaridoidea Baird, 1853
      - Acanthocheilidae Wülker, 1929
      - Anisakidae Railliet & Henry, 1912
      - Ascarididae Baird, 1853
      - Heterocheilidae Railliet & Henry, 1915
      - Raphidascarididae Hartwich, 1954
    - Superfamily Cosmocercoidea Travassos, 1925
      - Atractidae Travassos, 1919
      - Cosmocercidae Travassos, 1925
      - Kathlaniidae Travassos, 1918
    - Superfamily Heterakoidea Railliet & Henry, 1912
      - Ascaridiidae Travassos, 1919
      - Aspidoderidae Skrjabin & Shikhobalova, 1947
      - Heterakidae Railliet & Henry, 1912
    - Superfamily Seuratoidea Railliet, 1906
      - Chitwoodchabaudiidae Puylaert, 1970
      - Cucullanidae Cobbold, 1864
      - Quimperiidae Gendre, 1928
      - Schneidernematidae Freitas, 1956
      - Seuratidae Railliet, 1906
    - Superfamily Subuluroidea Yorke & Maplestone, 1926
      - Maupasinidae Inglis, 1959
      - Subuluridae Yorke & Maplestone, 1926
  - Infraorder Gnathostomatomorpha
    - Superfamily Gnathostomatoidea Railliet, 1895
      - Gnathostomatidae Railliet, 1895
  - Incertae sedis
    - Superfamily Dracunculoidea Stiles, 1907
      - Anguillicolidae Yamaguti, 1935
      - Daniconematidae Moravec & Køie, 1987
      - Dracunculidae Stiles, 1907
      - Guyanemidae Petter, 1975
      - Micropleuridae Baylis & Daubney, 1926
      - Philometridae Baylis & Daubney, 1926
      - Skrjabillanidae Shigin & Shigina, 1958
  - Infraorder Oxyuridomorpha
    - Superfamily Oxyuroidea Cobbold, 1864
      - Heteroxynematidae Skrjabin & Shikhobalova, 1948
      - Oxyuridae Cobbold, 1864
      - Pharyngodonidae Travassos, 1919
    - Superfamily Thelastomatoidea Travassos, 1929
      - Hystrignathidae Travassos, 1929
      - Protrelloididae Chitwood, 1932
      - Thelastomatidae Travassos, 1929
      - Travassosinematidae Rao, 1958
  - Infraorder Rhigonematomorpha
    - Superfamily Ransomnematoidea Travassos, 1930
      - Camoyidae Travassos & Kloss, 1960
      - Hethidae Travassos & Kloss, 1960
      - Ransomnematidae Travassos, 1930
    - Superfamily Rhigonematoidea Artigas, 1930
      - Ichthyocephalidae Travassos & Kloss, 1958
      - Rhigonematidae Artigas, 1930
  - Infraorder Spiruromorpha
    - Superfamily Acuarioidea Railliet, Henry & Sisoff, 1912
      - Acuariidae Railliet, Henry & Sisoff, 1912
    - Superfamily Aproctoidea Skrjabin & Shikhobalova, 1945
      - Aproctidae Skrjabin & Shikhobalova, 1945
      - Desmidocercidae Cram, 1927
    - Superfamily Camallanoidea Travassos, 1920
      - Camallanidae Railliet & Henry, 1915
    - Superfamily Diplotriaenoidea Anderson, 1958
      - Diplotriaenidae Anderson, 1958
      - Oswaldofilariidae Chabaud & Choquet, 1953
    - Superfamily Filarioidea Chabaud & Anderson, 1959
      - Filariidae Chabaud & Anderson, 1959
      - Onchocercidae Leiper, 1911
    - Superfamily Habronematoidea Ivaschkin, 1961
      - Cystidicolidae Skrjabin, 1946
      - Habronematidae Ivaschkin, 1961
      - Hedruridae Railliet, 1916
      - Tetrameridae Travassos, 1914
    - Superfamily Physalopteroidea Railliet, 1893
      - Physalopteridae Railliet, 1893
    - Superfamily Rictularoidea Railliet, 1916
      - Rictulariidae Railliet, 1916
    - Superfamily Spiruroidea Oerley, 1885
      - Gongylonematidae Sobolev, 1949
      - Hartertiidae Quentin, 1970
      - Spirocercidae Chitwood & Wehr, 1932
      - Spiruridae Oerley, 1885
    - Superfamily Thelazioidea Skrjabin, 1915
      - Pneumospiruridae Wu & Hu, 1938
      - Rhabdochonidae Skrjabin, 1946
      - Thelaziidae Skrjabin, 1915
- Suborder Tylenchina
  - Infraorder Cephalobomorpha
    - Superfamily Cephaloboidea Filipjev, 1934
      - Alirhabditidae Suryawanshi, 1971
      - Bicirronematidae Andrassy, 1978
      - Cephalobidae Filipjev, 1934
      - Elaphonematidae Heyns, 1962
      - Osstellidae Heyns, 1962
  - Infraorder Drilonematomorpha
    - Superfamily Drilonematoidea Pierantoni, 1916
      - Drilonematidae Pierantoni, 1916
      - Homungellidae Timm, 1966
      - Pharyngonematidae Chitwood, 1950
      - Ungellidae Chitwood, 1950
  - Incertae sedis
    - Superfamily Anguinoidea Nicoll, 1935
  - Infraorder Panagrolaimomorpha
    - Superfamily Panagrolaimoidea Thorne, 1937
      - Panagrolaimidae Thorne, 1937
    - Superfamily Strongyloidoidea Chitwood & McIntosh, 1934
      - Alloionematidae Chitwood & McIntosh, 1934
      - Rhabdiasidae Railliet, 1916
      - Steinernematidae Filipjev, 1934
      - Strongyloididae Chitwood & McIntosh, 1934
  - Infraorder Tylenchomorpha
    - Superfamily Aphelenchoidea Fuchs, 1937
      - Aphelenchidae Fuchs, 1937
      - Aphelenchoididae Skarbilovich, 1947
    - Superfamily Criconematoidea Taylor, 1936
      - Criconematidae Taylor, 1936
      - Hemicycliophoridae Skarbilovich, 1959
      - Tylenchulidae Skarbilovich, 1947
    - Superfamily Myenchoidea Pereira, 1931
      - Myenchidae Pereira, 1931
    - Superfamily Sphaerularioidea Lubbock, 1861
      - Anguinidae Nicoll, 1935
      - Iotonchidae Goodey, 1935
      - Neotylenchidae Thorne, 1941
      - Sphaerulariidae Lubbock, 1861
    - Superfamily Tylenchoidea Örley, 1880
      - Belonolaimidae Whitehead, 1959
      - Dolichodoridae Chitwood, 1950
      - Hoplolaimidae Filipjev, 1934
      - Meloidogynidae Skarbilovich, 1959
      - Pratylenchidae Thorne, 1949
      - Tylenchidae Örley, 1880
Order Spirurida
- Suborder Camallanina
Order Strongylida
- Superfamily Metastrongyloidea Lane, 1917
  - Pseudaliidae Railliet & Henry, 1909
- Superfamily Trichostrongyloidea (Durette-Desset, 1985)
  - Amidostomatidae Baylis & Daubney, 1926

Class Enoplea

Subclass Dorylaimia

Trichosomoides crassicauda

Order Dioctophymatida
- Suborder Dioctophymatina
  - Dioctophymidae Railliet, 1915
  - Soboliphymatidae Petrov, 1930
Order Dorylaimida
- Suborder Dorylaimina
  - Superfamily Belondiroidea Thorne, 1964
    - Belondiridae Thorne, 1939
  - Superfamily Dorylaimoidea de Man, 1876
    - Actinolaimidae Thorne, 1939
    - Aporcelaimidae Heyns, 1965
    - Dorylaimidae de Man, 1876
    - Longidoridae Thorne, 1935
    - Nordiidae Jairajpuri & Siddiqi, 1964
    - Qudsianematidae Jairajpuri, 1965
  - Incertae sedis
    - Thornenematidae Siddiqi, 1969
    - Thorniidae de Coninck, 1965
  - Superfamily Tylencholaimoidea Filipjev, 1934
    - Aulolaimoididae Jairajpuri, 1964
    - Leptonchidae Thorne, 1935
    - Mydonomidae Thorne, 1964
    - Tylencholaimellidae Jairajpuri, 1964
    - Tylencholaimidae Filipjev, 1934
- Suborder Nygolaimina
  - Superfamily Nygolaimoidea Thorne, 1935
    - Aetholaimidae Jairajpuri, 1965
    - Nygellidae Andrassy, 1958
    - Nygolaimellidae Clark, 1961
    - Nygolaimidae Thorne, 1935
Order Isolaimida
- Superfamily Isolaimoidea Timm, 1969
  - Isolaimiidae Cobb, 1920
Order Marimermithida
- Marimermithidae Rubtzov & Platonova, 1974
Order Mermithida
- Suborder Mermithina
  - Superfamily Mermithoidea Braun, 1883
    - Mermithidae Braun, 1883
    - Tetradonematidae Cobb, 1919
Order Mononchida
- Suborder Bathyodontina
  - Superfamily Cryptonchoidea Chitwood, 1937
    - Bathyodontidae Clark, 1961
    - Cryptonchidae Chitwood, 1937
  - Superfamily Mononchuloidea de Coninck, 1965
    - Mononchulidae de Coninck, 1965
- Suborder Mononchina
  - Superfamily Anatonchoidea Jairajpuri, 1969
    - Anatonchidae Jairajpuri, 1969
  - Incertae sedis
    - Cobbonchidae Jairajpuri, 1969
    - Iotonchidae Jairajpuri, 1969
  - Superfamily Mononchoidea Filipjev, 1934
    - Mononchidae Filipjev, 1934
    - Mylonchulidae Jairajpuri, 1969
Order Muspiceida
- Suborder Muspiceina
  - Muspiceidae Bain & Chabaud, 1959
  - Robertdollfusiidae Chabaud & Campana, 1950
Order Trichinellida
- Superfamily Trichinelloidea Ward, 1907
  - Anatrichosomatidae Yamaguti, 1961
  - Capillariidae Railliet, 1915
  - Cystoopsidae Skrjabin, 1923
  - Trichinellidae Ward, 1907
  - Trichosomoididae Yorke & Maplestone, 1926
  - Trichuridae Railliet, 1915

Subclass Enoplia

Mermis nigrescens

Order Enoplida
- Suborder Alaimina
  - Superfamily Alaimoidea Micoletzky, 1922
    - Alaimidae Micoletzky, 1922
- Suborder Campydorina
  - Superfamily Campydoroidea Jairajpuri, 1976
    - Campydoridae (Thorne, 1935)
- Suborder Dioctophymina
- Suborder Enoplina
  - Superfamily Enoploidea Dujardin, 1845
    - Anoplostomatidae Gerlach & Riemann, 1974
    - Anticomidae Filipjev, 1918
    - Enoplidae Dujardin, 1845
    - Phanodermatidae Filipjev, 1927
    - Thoracostomopsidae Filipjev, 1927
- Incertae sedis
  - Andrassyidae Tchesunov & Gagarin, 1999
- Suborder Ironina
  - Superfamily Ironoidea de Man, 1876
    - Ironidae de Man, 1876
    - Leptosomatidae Filipjev, 1916
    - Oxystominidae Chitwood, 1935
- Suborder Oncholaimina
  - Superfamily Oncholaimoidea Filipjev, 1916
    - Enchelidiidae Filipjev, 1918
    - Oncholaimidae Filipjev, 1916
    - Thalassogeneridae Orton Williams & Jairajpuri, 1984
- Suborder Trefusiina
  - Superfamily Trefusioidea Gerlach, 1966
    - Lauratonematidae Gerlach, 1953
    - Simpliconematidae Blome & Schrage, 1985
    - Trefusiidae Gerlach, 1966
    - Trischistomatidae Andrassy, 2007
    - Xenellidae de Coninck, 1965
- Suborder Trichinellina
- Suborder Tripyloidina
  - Superfamily Tripyloidoidea Filipjev, 1928
    - Tripyloididae Filipjev, 1918
Order Triplonchida
- Suborder Diphtherophorina
  - Superfamily Diphtherophoroidea Micoletzkyi, 1922
    - Diphtherophoridae Micoletzky, 1922
    - Trichodoridae Thorne, 1935
- Incertae sedis
  - Bastianiidae de Coninck, 1965
  - Odontolaimidae Gerlach & Riemann, 1974
- Suborder Tobrilina
  - Superfamily Prismatolaimoidea Micoletzky, 1922
    - Prismatolaimidae Micoletzky, 1922
  - Superfamily Tobriloidea Filipjev, 1918
    - Pandolaimidae Belogurov, 1980
    - Rhabdodemaniidae Filipjev, 1934
    - Tobrilidae de Coninck, 1965
    - Triodontolaimidae de Coninck, 1965
- Suborder Tripylina
  - Superfamily Tripyloidea de Man, 1876
    - Tripyloidea de Man, 1876
    - Tripylidae de Man, 1876

Incertae sedis

Order Benthimermithida
- Benthimermithidae Petter, 1980
Order Rhaptothyreida
- Rhaptothyreidae Hope & Murphy, 1969

Class Secernentea

Caenorhabditis elegans

Rhabditia

Nippostrongylus brasiliensis

Unidentified Anisakidae (Ascaridina: Ascaridoidea)

Oxyuridae Threadworm

Spiruridae Dirofilaria immitis

Order Camallanida (sometimes included in Spirurida)
- Family Anguillicolidae
- Family Camallanidae
- Family Dracunculidae
- Family Micropleudidae
- Family Philometridae
Order Drilonematida (sometimes included in Spirurida)
Order Oxyurida (= Rhabdiasida)
- Family Heteroxynematidae
- Family Oxyuridae
- Family Pharyngodonidae
- Family Thelastomatidae
Order Rhigonematida (formerly in Tylenchia)
Order Spirurida
- Superfamily Acuarioidea
- Superfamily Aproctoidea
- Superfamily Diplotriaenoidea
- Superfamily Filarioidea
- Superfamily Gnathostomatoidea
- Superfamily Habronematoidea
- Superfamily Physalopteroidea
- Superfamily Rictularioidea
- Superfamily Spiruroidea
- Superfamily Thelazioidea

Subclass Diplogasteria

(may belong in Rhabditia)

Diplogastridae Pristionchus pacificus

Order Diplogasterida
Suborder Chambersiellina Hodda 2007
- Superfamily Chambersielloidea Thorne 1937
  - Family Chambersiellidae Thorne 1937 (Sanwal 1957)
Suborder Diplogasterina Paramonov 1952
- Superfamily Cylindrocorporoidea T. Goodey 1939
  - Family Cylindrocorporidae T. Goodey 1939
  - Family Odontopharyngidae Micoletzky 1922
- Superfamily Diplogasteroidea Micoletzky 1922
  - Family Cephalobiidae Travassos & Kloss 1960a
  - Family Diplogasteridae Micoletzky 1922
  - Family Diplogasteroididae Paramonov 1952
  - Family Neodiplogasteridae Paramonov 1952
  - Family Pseudodiplogasteroididae De Ley & Blaxter 2002
  - Family Tylopharyngidae Filipjev 1918
Suborder Myolaimina Inglis 1983
- Superfamily Carabonematoidea Stammer & Wachek 1952
  - Family Carabonematidae Stammer & Wachek 1952
- Superfamily Myolaimoidea Goodey 1963
  - Family Myolaimidae Goodey 1963

Subclass Tylenchia