Between brackets is the number of accepted species
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- Biota
- Kingdom Animalia
- Phylum Acanthocephala
- Phylum Agmata †
- Phylum Animalia (awaiting allocation)
- Phylum Animalia incertae sedis
- Phylum Annelida
- Phylum Arthropoda
- Phylum Brachiopoda
- Phylum Bryozoa
- Phylum Cephalorhyncha incertae sedis
- Phylum Chaetognatha
- Phylum Chitinozoa †
- Phylum Chordata
- Phylum Cnidaria
- Phylum Ctenophora
- Phylum Cycliophora
- Phylum Cycloneuralia incertae sedis
- Phylum Ecdysozoa incertae sedis †
- Phylum Echinodermata
- Phylum Entoprocta
- Phylum Gastrotricha
- Phylum Gnathostomulida
- Phylum Hemichordata
- Phylum Hyolitha †
- Phylum Kinorhyncha
- Phylum Lobopoda †
- Phylum Loricifera
- Phylum Micrognathozoa
- Phylum Mollusca
- Phylum Monoblastozoa accepted as Animalia incertae sedis
- Phylum Nematoda
- Class Adenophorea
- Class Aphasmida
- Class Chromadorea
- Order Aphelenchida accepted as Panagrolaimida
- Order Ascaridida accepted as Spirurida
- Order Benthimermithida
- Order Camallanida accepted as Spirurida
- Order Chromadorida
- Order Desmodorida
- Order Desmoscolecida
- Order Diplogasterida
- Order Draconematina accepted as Desmodorida
- Order Drilonematida
- Order Filariidea accepted as Spirurida
- Order Leptolaimida
- Order Monhysterida
- Order Oxyurida accepted as Spirurida
- Order Panagrolaimida
- Order Plectida
- Order Rhabditida
- Order Selachinematida
- Order Spirurida
- Family Acanthocheilidae Wülker, 1929 accepted as Anisakidae Railliet & Henry, 1912
- Family Acuariidae Railliet, Henry & Sisoff, 1912
- Family Ancyracanthidae accepted as Gnathostomatidae Railliet, 1895
- Family Anguillicolidae Yamaguti, 1935
- Family Anisakidae Railliet & Henry, 1912
- Family Aoruridae Walton, 1927 accepted as Thelastomatidae Travassos, 1929
- Family Aproctidae Yorke & Maplestone, 1926
- Family Ascaridae Baird, 1853 accepted as Ascarididae Baird, 1853
- Family Ascarididae Baird, 1853
- Family Ascaridiidae Travassos, 1920
- Family Askaridae Schneidemuehl, 1896 accepted as Ascarididae Baird, 1853
- Family Aspidoderidae Skrjabin & Schikhobalova, 1947
- Family Atractidae Railliet, 1917
- Family Blattophilidae Skrjabin, Schikhobalova & Lagodovskaya, 1966 accepted as Thelastomatidae Travassos, 1929
- Family Brumptaemiliidae accepted as Carnoyidae Filipjev, 1934
- Family Camallanidae Railliet & Henry, 1915
- Family Carnoyidae Filipjev, 1934
- Family Chitwoodchabaudiidae Puylaert, 1970
- Family Chitwoodiellidae Kloss, 1960 accepted as Travassosinematidae Rao, 1958
- Family Cobboldinidae Skrjabin, 1948 accepted as Atractidae Railliet, 1917
- Family Coronostomatidae Travassos & Kloss, 1961 accepted as Thelastomatidae Travassos, 1929
- Family Cosmocercidae Railliet, 1916
- Family Crossocephalidae Yorke & Maplestone, 1926 accepted as Atractidae Railliet, 1917
- Family Crossophoridae Baylis, 1920
- Family Cucullanidae Cobbold, 1864
- Family Cystidicolidae Skrjabin et al., 1949
- Family Dacnitidae Baird, 1853 accepted as Kathlaniidae Lane, 1914
- Family Daniconematidae Moravec & Køie, 1987
- Family Desmidocercidae Cram, 1927
- Family Dipetalonematidae Wehr, 1935 accepted as Onchocercidae Leiper, 1911
- Family Diplotriaenidae Skrjabin, 1916
- Family Dracunculidae Stiles, 1907
- Family Dubioxyuridae Ortlepp, 1937 accepted as Maupasinidae Inglis, 1960
- Family Filariidae Weinland, 1858
- Family Gnathostomatidae Railliet, 1895
- Family Goeziidae accepted as Anisakidae Railliet & Henry, 1912
- Family Gongylonematidae Hall, 1916
- Family Grathostomidae Skrjabin, 1916 accepted as Gnathostomatidae Railliet, 1895
- Family Guyanemidae Petter, 1974
- Family Habronematidae Chitwood & Wehr, 1932
- Family Hartertiidae Quentin, 1970
- Family Hedruridae Petter, 1971
- Family Heterakidae Railliet & Henry, 1912
- Family Heterocheilidae Railliet & Henry, 1915
- Family Heteroxynematidae Skrjabin & Shikhobalova, 1948
- Family Hethidae Skrjabin & Shikhobalova, 1951
- Family Hystrignathidae Travassos, 1929
- Family Ichthyocephalidae Travassos & Kloss, 1958
- Family Kathlaniidae Lane, 1914
- Family Kiwinematidae accepted as Heterakidae Railliet & Henry, 1912
- Family Lucionematidae Moravec, Molnár & Szekely, 1998
- Family Maupasinidae Inglis, 1960
- Family Micropleuridae Baylis & Daubney, 1926
- Family Onchocercidae Leiper, 1911
- Family Oncocercidae Yamaguti, 1961 accepted as Onchocercidae Leiper, 1911
- Family Oswaldofilariidae Chabaud & Choquet, 1953 accepted as Onchocercidae Leiper, 1911
- Family Oxyuridae Cobbold, 1864
- Genus Acanthoxyuris accepted as Acanthoxyurus Sandground, 1928
- Genus Acanthoxyurus Sandground, 1928
- Genus Adelonema Mawson, 1978
- Genus Africanoxys Hugot, 1981 accepted as Syphatineria Chabaud & Biocca, 1955
- Genus Anaspicularis Akhtar, 1955
- Genus Anaspiculuris Akhtar, 1955
- Genus Anterogoniporus Gambhir, Gyaneswori, Tarnita, Chinglenkhomba, Indrani & Zenith, 2009
- Genus Archeonema Ricci, 1988
- Genus Auchenacantha Baylis, 1929
- Genus Austroxyuris Johnston & Mawson, 1938
- Genus Avilandras Skrjabin & Shikhobalova in Skrjabin et al., 1951
- Genus Biguetius Chabaud, Petter & Golvan, 1961
- Genus Buckleyenterobius Sandosham, 1950 accepted as Paraoxyuronema Artigas, 1937
- Genus Carolodelatorrella Vigueras, 1943 accepted as Helminthoxys Freitas, Lent & Almeida, 1937
- Genus Caroloxyuris Jimenez-Ruiz & Gardner, 2003
- Genus Chilocrypta Mönnig, 1932 accepted as Skrjabinema Verestchagin, 1926
- Genus Citellina Prendel, 1928
- Genus Colobenterobius Quentin, Bellerton & Krishnasamy, 1980 accepted as Enterobius Baird, 1853
- Genus Cricetoxyuris Hugot, 1988 accepted as Syphacia Seurat, 1916
- Genus Didelphoxyuris Gardner & Hugot, 1995
- Genus Enterobius Baird, 1853
- Genus Evaginuris Skrjabin & Shikhobalova in Skrjabin et al., 1951
- Genus Furconema Gairola & Malhotra, 1988
- Genus Fusarella Seurat, 1916 accepted as Enterobius Baird, 1853
- Genus Gynaecometra Araujo, 1978
- Genus Hapaloxyuris Inglis & Cosgrove, 1964 accepted as Trypanoxyuris Vevers, 1923
- Genus Haplacis Railliet & Henry, 1916
- Genus Helminthoxys Freitas, Lent & Almeida, 1937
- Genus Heteromyoxyuris Quentin, 1974
- Genus Hilgertia Quentin, 1974 †
- Genus Hoepplius Chu, 1931
- Genus Hoplodontophorus Turner, 1922
- Genus Idiuoxyuris Hugot, 1988
- Genus Inglisoxyuris accepted as Lemuricola Chabaud & Petter, 1960
- Genus Ingloxyuris Chabaud, Petter & Golvan, 1961 accepted as Lemuricola Chabaud & Petter, 1960
- Genus Laoxyuris Hugot, Feliu, Douangboupha & Ribas, 2013
- Genus Lemuricola Chabaud & Petter, 1960
- Genus Lepturis Schlotthauber, 1860 accepted as Oxyuris Rudolphi, 1803
- Genus Lepusius Farooq & Khatoon, 1995
- Genus Lobatorobius Skrjabin & Shikhobalova in Skrjabin et al., 1951
- Genus Lorentzicola Smales, 2010
- Genus Macropoxyuris Mawson, 1964
- Genus Madoxyuris Chabaud, Brygoo & Petter, 1965 accepted as Lemuricola Chabaud & Petter, 1960
- Genus Monodelphoxyuris Guerrero & Hugot, 2003
- Genus Neohilgertia Navone, Suriano & Pujol, 1990
- Genus Neyrapharingodon Calvente, 1948 accepted as Neyrapharyngodon Calvente, 1948
- Genus Neyrapharyngodon Calvente, 1948
- Genus Octodonthoxys Quentin, Courtin & Fontecilla, 1975 accepted as Helminthoxys Freitas, Lent & Almeida, 1937
- Genus Odontogeton Allgén, 1921
- Genus Odontorobius Skrjabin & Shikhabalova in Skrjabin et al., 1951 accepted as Paraoxyuronema Artigas, 1937
- Genus Orientoxys Hugot, 1981 accepted as Syphatineria Chabaud & Biocca, 1955
- Genus Oryuris Mudie in Blyth, 1840 accepted as Oxyuris Rudolphi, 1803
- Genus Oxiuris Leuckart in Froriep, 1835 accepted as Oxyuris Rudolphi, 1803
- Genus Oxiurus Sonsino, 1878 accepted as Oxyuris Rudolphi, 1803
- Genus Oxyaris Calmette, 1895 accepted as Oxyuris Rudolphi, 1803
- Genus Oxyurias Stiles in Stiles & Hassall, 1905 accepted as Enterobius Baird, 1853
- Genus Oxyuris Rudolphi, 1803
- Genus Oxyuronema Kreis, 1932
- Genus Oxyuros Oliveira, 1904 accepted as Oxyuris Rudolphi, 1803
- Genus Oxyurus Lamarck, 1816 accepted as Oxyuris Rudolphi, 1803
- Genus Paraicosiella Majumdar & Chakravarty, 1963
- Genus Paraoxyuronema Artigas, 1937
- Genus Paraspiculuris Akhtar, 1955
- Genus Parathelandros Magzoub, Kasim & Shawa, 1980
- Genus Paraustroxyuris Mawson, 1964
- Genus Paroxyuronema accepted as Paraoxyuronema Artigas, 1937
- Genus Passalurus Dujardin, 1844
- Genus Passelurus Galeb, 1878 accepted as Passalurus Dujardin, 1844
- Genus Petauxyuris Hugot, 1985 accepted as Sypharista Quentin, 1971
- Genus Petronema Hugot, 1983 accepted as Acanthoxyurus Sandground, 1928
- Genus Pongobius Barus, Foitová, Koubková, Hodova, Simková & Nurcahyo, 2007
- Genus Potoroxyuris Mawson, 1964
- Genus Protenterobius Inglis, 1961 accepted as Lemuricola Chabaud & Petter, 1960
- Genus Protozoophaga Travassos, 1923
- Genus Pseudaspiculuris Akhtar, 1955
- Genus Quentenora Hugot, 1981 accepted as Syphatineria Chabaud & Biocca, 1955
- Genus Quentinema Hugot, 1985 accepted as Sypharista Quentin, 1971
- Genus Rauschtineria Hugot, 1980
- Genus Rodentoxyuris Quentin & Tenora, 1975 accepted as Lemuricola Chabaud & Petter, 1960
- Genus Rumbaisyphacia Dewi, Hasegawa & Asakawa, 2014 accepted as Syphacia Seurat, 1916
- Genus Sarcophiloxyuris Barton, Smales, Lee, Zhu & Shamsi, 2021
- Genus Segienamsyphacia Dewi, Hasegawa & Asakawa, 2014 accepted as Syphacia Seurat, 1916
- Genus Seuratoxyuris Hugot, 1988 accepted as Syphacia Seurat, 1916
- Genus Skjrabinema accepted as Skrjabinema Verestchagin, 1926
- Genus Skrjabinema Verestchagin, 1926
- Genus Skryabineandros Markov, 1962
- Genus Subaspiculuris Akhtar, 1955
- Genus Syphabulea Gubanov, 1964
- Species Syphabulea coli Quentin & Krishnasamy, 1975
- Species Syphabulea critesi Quentin & Krishnasamy, 1975
- Species Syphabulea magnispicula Schmidt & Kuntz, 1968
- Species Syphabulea magnispiculoides Quentin & Krishnasamy, 1975
- Species Syphabulea mascomai Hugot & Feliu, 1990
- Species Syphabulea maseri Hugot, 1981
- Species Syphabulea sarawakensis Quentin & Krishnasamy, 1975
- Species Syphabulea schmidti Quentin & Krishnasamy, 1975
- Species Syphabulea sobolevi Gubanov, 1964 accepted as Syphabulea tjanschani Ablasov, 1962
- Species Syphabulea thompsoni Price, 1928
- Species Syphabulea tjanschani Ablasov, 1962
- Species Syphabulea toschevi Petrov & Bayanov, 1962 accepted as Syphabulea tjanschani Ablasov, 1962
- Genus Syphacia Seurat, 1916
- Genus Syphaciuris Skrjabin & Shikhobalova in Skrjabin et al., 1951
- Genus Syphaciurus accepted as Syphaciuris Skrjabin & Shikhobalova in Skrjabin et al., 1951
- Genus Sypharista Quentin, 1971
- Genus Syphatineria Chabaud & Biocca, 1955
- Genus Tlacuatzoxyuris Jiménez, Caspeta-Mandujano & Albino-Miranda, 2019
- Genus Trypanoxyuris Vevers, 1923
- Genus Welcomia accepted as Wellcomia Sambon, 1907
- Genus Wellocomia Sambon, 1907 accepted as Wellcomia Sambon, 1907
- Genus Xeroxyuris Hugot, 1995
- Genus Zenkoxyuris Quentin, 1975 †
- Family Pharyngodonidae Travassos, 1920
- Family Philometridae Baylis & Daubney, 1926
- Family Phlyctainophoridae Roman, 1965
- Family Physalopteridae Railliet, 1893
- Family Pneumospiruridae Wu & Hu, 1938
- Family Protrelloididae Chitwood, 1932
- Family Pseudonymidae Adamson & Buck, 1990
- Family Pulchrocephalidae Kloss, 1960 accepted as Travassosinematidae Rao, 1958
- Family Quimperiidae Gendre, 1928
- Family Ransomnematidae Travassos, 1930
- Family Raphidascarididae Hartwich, 1954
- Family Rhabdochonidae Travassos, Artigas & Pereira, 1928
- Family Rhigonematidae Artigas, 1930
- Family Rictulariidae Hall, 1916
- Family Ringonematidae accepted as Rhigonematidae Artigas, 1930
- Family Schneidernematidae Freitas, 1956
- Family Setariidae Yorke & Maplestone, 1926 accepted as Onchocercidae Leiper, 1911
- Family Seuratidae Hall, 1916
- Family Skrjabillanidae Shigin & Shigina, 1958
- Family Spinitectidae Skrjabin, 1946 accepted as Cystidicolidae Skrjabin et al., 1949
- Family Spirocercidae Chitwood & Wehr, 1932
- Family Spiropteridae Leiper, 1911 accepted as Acuariidae Railliet, Henry & Sisoff, 1912
- Family Spirurida incertae sedis
- Family Spiruridae Örley, 1885
- Family Steinertetanonematidae Sokolov, 2010
- Family Stephanofilariidae accepted as Filariidae Weinland, 1858
- Family Streptocaridae Skrjabin, Sobolev & Ivashkin, 1965 accepted as Acuariidae Railliet, Henry & Sisoff, 1912
- Family Subuluridae Travassos, 1914
- Family Tetanonematidae Skryabin & Shikhobalova, 1948 accepted as Steinertetanonematidae Sokolov, 2010
- Family Tetrameridae Travassos, 1914
- Family Thelastomatidae Travassos, 1929
- Family Thelastomidae accepted as Thelastomatidae Travassos, 1929
- Family Thelaziidae Railliet, 1910
- Family Toxocaridae accepted as Ascarididae Baird, 1853
- Family Travassosinematidae Rao, 1958
- Family Tricheilidae Wang & Wang, 1991
- Family Xustromatidae Hunt, 2002
- Family Xustrostomatidae Hunt, 2002 accepted as Xustromatidae Hunt, 2002
- Order Strongylida accepted as Panagrolaimida
- Order Teratocephalida
- Order Tylenchida accepted as Panagrolaimida
- Class Dorylaimea
- Class Enoplea
- Class Nematoda (awaiting allocation)
- Class Nematoda incertae sedis
- Class Rhabditea
- Class Secernentea
- Phylum Nematomorpha
- Phylum Nemertea
- Phylum Onychophora
- Phylum Orthonectida
- Phylum Phoronida
- Phylum Placozoa
- Phylum Platyhelminthes
- Phylum Pogonophora accepted as Siboglinidae Caullery, 1914
- Phylum Porifera
- Phylum Priapula accepted as Priapulida
- Phylum Priapulida
- Phylum Problematica † accepted as Animalia incertae sedis
- Phylum Rhombozoa
- Phylum Rotifera
- Phylum Scalidophora incertae sedis
- Phylum Sipuncula
- Phylum Tardigrada
- Phylum Trace fossils †
- Phylum Vendobionta †
- Phylum Vestimentifera accepted as Siboglinidae Caullery, 1914
- Phylum Vetulicolia †
- Phylum Vinctiplicata incertae sedis †
- Phylum Xenacoelomorpha
- Genus Trilobocaris Pribyl, 1953 †
- Kingdom Archaea
- Kingdom Bacteria
- Kingdom Chromista
- Kingdom Fungi
- Kingdom Plantae
- Kingdom Protista accepted as Protozoa
- Kingdom Protozoa
- Kingdom Viruses
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