Between brackets is the number of accepted species
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2 Shows the number of accepted species within the taxon
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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
- Genus Aviabronema Ali, 1961 accepted as Procyrnea Chabaud, 1958
- Genus Cathematella Yamaguti, 1961 accepted as Torquatoides Williams, 1929
- Genus Cheilonematodum Johnston & Mawson, 1941
- Genus Cheniellospirura Kuo, 1961 accepted as Gendrespirura Chabaud, 1958
- Genus Chenospirura Hsu, 1957 accepted as Cyrnea Seurat, 1914
- Genus Chenospirura Kou, 1958 accepted as Gendrespirura Chabaud, 1958
- Genus Chitwoodspirura Chabaud & Rousselot, 1956
- Genus Cyrnea Seurat, 1914
- Genus Dermofilaria Rivolta, 1884 accepted as Habronema Diesing, 1861
- Genus Dollfusnema Caballero, 1974
- Genus Draschearia Skrjabin, Sobolev & Ivaschkin, 1965 accepted as Procyrnea Chabaud, 1958
- Genus Draschia Chitwood & Wehr, 1934
- Genus Echinurioides Thwaite, 1926
- Genus Excisa Gendre in Joyeux, Gendre & Baer, 1928
- Genus Gendrespira Chabaud, 1958 accepted as Gendrespirura Chabaud, 1958
- Genus Gendrespirura Chabaud, 1958
- Genus Gilsonia Gedoelst, 1919 accepted as Hadjelia Seurat, 1916
- Genus Gubernaculomeres Oshmarin & Parukhin, 1963
- Genus Habronema Diesing, 1861
- Genus Hadjelia Seurat, 1916
- Genus Histeocephalus Molin, 1860 accepted as Histiocephalus Diesing, 1851
- Genus Histiocephalus Diesing, 1851
- Genus Leprirophus Skrjabin, Sobolev & Ivaschkin, 1965 accepted as Torquatoides Williams, 1929
- Genus Metacyrnea Chabaud, 1961
- Genus Odontospirura Wehr, 1933
- Genus Okapinema Ivashkin, 1960
- Genus Parabronema Baylis, 1921
- Genus Parhadjelia Lent & Freitas, 1939 accepted as Hadjelia Seurat, 1916
- Genus Procyrnea Chabaud, 1958
- Genus Ruschiella Teixeira de Freitas, 1967 accepted as Procyrnea Chabaud, 1958
- Genus Serticeps Railliet, 1916 accepted as Viguiera Seurat, 1913
- Genus Seurocyrnea Strand, 1929 accepted as Cyrnea Seurat, 1914
- Genus Sicarius Li, 1934
- Genus Sinicaspirura Skrjabin & Sobolev, 1963 accepted as Gendrespirura Chabaud, 1958
- Genus Skrjabinochona Guschanskaja, 1931 accepted as Cyrnea Seurat, 1914
- Genus Sobolevicephalus Parukhin, 1964 accepted as Hadjelia Seurat, 1916
- Genus Spirocaudata Sharma, 1971 † accepted as Viguiera Seurat, 1913
- Genus Squamanema Van Thiel, 1925 accepted as Parabronema Baylis, 1921
- Genus Stellabronema Gushanskaya, 1937 accepted as Hadjelia Seurat, 1916
- Genus Stellobronema Guschanskaja, 1937 accepted as Hadjelia Seurat, 1916
- Genus Stellocaronema Gilbert, 1930
- Genus Torquatella Yorke & Maplestone, 1926 accepted as Torquatoides Williams, 1929
- Genus Torquatoides Williams, 1929
- Genus Vaznema Freitas & Lent, 1948 accepted as Odontospirura Wehr, 1933
- Genus Viguiera Seurat, 1913
- 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
- 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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