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
- Class Dorylaimea
- Order Bathyodontida
- Order Dioctophymatida
- Order Dorylaimida
- Family Actinolaimidae Thorne, 1939
- Family Aetholaimidae Jairajpuri, 1965
- Family Aporcelaimidae Heyns, 1965
- Family Arctidorylaimidae Mulvey & Anderson, 1979 accepted as Dorylaimidae de Man, 1876
- Family Aulolaimoididae Jairajpuri, 1964
- Family Axonchiidae Thorne, 1964 accepted as Belondiridae Thorne, 1939
- Family Basirotyleptidae Siddiqi & Khan, 1964 accepted as Leptonchidae Thorne, 1935
- Family Belondiridae Thorne, 1939
- Family Belonenchidae Thorne, 1964 accepted as Leptonchidae Thorne, 1935
- Family Brittonematidae Thorne, 1967 accepted as Actinolaimidae Thorne, 1939
- Family Carcharolaimidae Thorne, 1967
- Family Chrysonematidae Siddiqi, 1969 accepted as Qudsianematidae Jairajpuri, 1965
- Family Crateronematidae Siddiqi, 1969 accepted as Qudsianematidae Jairajpuri, 1965
- Family Discolaimidae Siddiqi, 1969 accepted as Qudsianematidae Jairajpuri, 1965
- Family Dorylaimellidae Jairajpuri, 1964 accepted as Belondiridae Thorne, 1939
- Family Dorylaimidae de Man, 1876
- Family Dorylaimoidea incertae sedis
- Family Dorylaimoididae Siddiqi, 1969 accepted as Mydonomidae Thorne, 1964
- Family Encholaimidae Golden & Murphy, 1967 accepted as Leptonchidae Thorne, 1935
- Family Falcihastidae Siddiqi, 1968 accepted as Belondiridae Thorne, 1939
- Family Kochinematidae Darekar & Khan, 1979 accepted as Nordiidae Siddiqi, 1969
- Family Leptonchidae Thorne, 1935
- Family Longidoridae Thorne, 1935
- Family Miranematidae Siddiqi, 1969 accepted as Mydonomidae Thorne, 1964
- Family Mydonomidae Thorne, 1964
- Family Neoactinolaimidae Thorne, 1967 accepted as Actinolaimidae Thorne, 1939
- Family Nordiidae Siddiqi, 1969
- Family Nygellidae Andrássy, 1958
- Family Nygolaimellidae Clark, 1961
- Family Nygolaimidae Thorne, 1935
- Genus Aetholaimus Williams, 1962
- Genus Afronygus Heyns, 1968
- Genus Aporcelaimoides Heyns, 1965
- Genus Aquatides Heyns, 1968
- Genus Clavicauda Heyns, 1968
- Genus Clavicaudatus accepted as Clavicaudoides Heyns, 1968
- Genus Clavicaudoides Heyns, 1968
- Genus Feroxides Heyns, 1968
- Genus Laevides Heyns, 1968
- Genus Nygellus Thorne, 1939
- Genus Nygolaimoides Meyl, 1960
- Genus Nygolaimus Thorne, 1930
- Species Nygolaimus acridens Thorne, 1974
- Species Nygolaimus acuticaudatus Thorne, 1930 accepted as Paravulvus acuticaudatus (Thorne, 1930)
- Species Nygolaimus altherri Heyns, 1968 accepted as Clavicaudoides altherri (Heyns, 1968)
- Species Nygolaimus amphigonicus Thorne, 1930
- Species Nygolaimus andrassyi Heyns, 1968 accepted as Paravulvus andrassyi (Heyns, 1968)
- Species Nygolaimus anneckei Heyns, 1968
- Species Nygolaimus aquaticus Thorne, 1930
- Species Nygolaimus asymmetricus Andrássy, 1962 accepted as Laevides americanus Loof, Jairajpuri & Ahmad, 1995
- Species Nygolaimus australis Heyns, 1968 accepted as Solididens australis (Heyns, 1968)
- Species Nygolaimus baeticus Liebanas & Pena-Santiago, 1997
- Species Nygolaimus bisexualis Thorne, 1939 accepted as Solididens bisexualis (Thorne, 1939)
- Species Nygolaimus brachyuris (de Man, 1880)
- Species Nygolaimus brachyuroides Vinciguerra & Zullini, 1980
- Species Nygolaimus butteus Thorne, 1974
- Species Nygolaimus capensis Heyns, 1968 accepted as Solididens capensis (Heyns, 1968)
- Species Nygolaimus capitellus Vinciguerra & Orselli, 2000
- Species Nygolaimus captivitatis (Andrássy, 1962)
- Species Nygolaimus christei Heyns, 1968 accepted as Aquatides christei (Heyns, 1968)
- Species Nygolaimus clavicaudatus Altherr, 1953 accepted as Clavicaudoides clavicaudatus (Altherr, 1953)
- Species Nygolaimus cuniculus Altherr, 1950 accepted as Laevides cuniculus (Altherr, 1950)
- Species Nygolaimus curvidens Heyns, 1968
- Species Nygolaimus cylindricus Thorne, 1974
- Species Nygolaimus denticulatus Cobb, 1922 accepted as Nygolaimium denticulatum Cobb, 1922
- Species Nygolaimus directus Heyns, 1968
- Species Nygolaimus diversus Liebanas & Pena-Santiago, 1997
- Species Nygolaimus dorotheae Heyns, 1968
- Species Nygolaimus dubius Thorne, 1930 accepted as Paravulvus hartingii (de Man, 1880)
- Species Nygolaimus elainnae Botha & Heyns, 1990
- Species Nygolaimus europaeus Heyns, 1968
- Species Nygolaimus ferox
- Species Nygolaimus georgiensis Eliava, 1966
- Species Nygolaimus gigantus Shahina, Erum & Siddiqi, 2005
- Species Nygolaimus gobabiensis Heyns, 1968
- Species Nygolaimus gracillimus Andrássy, 1968
- Species Nygolaimus harishi Ahmad & Jairajpuri, 1980
- Species Nygolaimus hartingi
- Species Nygolaimus heynsi Altherr, 1972 accepted as Clavicaudoides heynsi (Altherr, 1972)
- Species Nygolaimus husmanni Meyl, 1954 accepted as Laevides husmanni (Meyl, 1954)
- Species Nygolaimus hyans Thorne, 1974
- Species Nygolaimus kaburakii Imamura, 1931 accepted as Aquatides kaburakii (Imamura, 1931)
- Species Nygolaimus laevis Thorne, 1939 accepted as Laevides laevis (Thorne, 1939)
- Species Nygolaimus liberiensis Heyns, 1968 accepted as Clavicaudoides liberiensis (Heyns, 1968)
- Species Nygolaimus longicaudatus Heyns, 1968 accepted as Afronygus longicaudatus (Heyns, 1968)
- Species Nygolaimus loofi Heyns, 1968 accepted as Laevides loofi (Heyns, 1968)
- Species Nygolaimus macrobrachyuris Heyns, 1968
- Species Nygolaimus macrospiculum Altherr, 1958 accepted as Sectonema macrospiculum (Altherr, 1958)
- Species Nygolaimus menzeli Micoletzky, 1925 accepted as Nygolaimium menzeli (Micoletzky, 1925)
- Species Nygolaimus minimus Vinciguerra & Zullini, 1980
- Species Nygolaimus neodubius Heyns, 1968 accepted as Paravulvus acuticaudatus (Thorne, 1930)
- Species Nygolaimus neominimus Shahina, Erum & Siddiqi, 2005
- Species Nygolaimus obtus Thorne, 1930
- Species Nygolaimus pachydermatus
- Species Nygolaimus papillicaudatus Heyns, 1968
- Species Nygolaimus papilloides Thorne, 1974
- Species Nygolaimus paraamphigonicus Altherr, 1950 accepted as Paravulvus hartingii (de Man, 1880)
- Species Nygolaimus paraaquaticus Paetzold, 1958 accepted as Laevides paraaquaticus (Paetzold, 1958)
- Species Nygolaimus parabrachyuris Heyns, 1968
- Species Nygolaimus paramonovi Eliava, 1966 accepted as Sectonema paramonovi (Eliava, 1966)
- Species Nygolaimus paramphigonicus Altherr, 1950 accepted as Paravulvus paramphigonicus (Altherr, 1950)
- Species Nygolaimus paratenuis Thorne, 1974
- Species Nygolaimus parvus Thorne, 1974
- Species Nygolaimus paulbuschneri Meyl, 1956 accepted as Paranygolaimus paulbuschneri (Meyl, 1956)
- Species Nygolaimus planposae Altherr, 1952 accepted as Paravulvus planposae (Altherr, 1952)
- Species Nygolaimus rapax Thorne, 1939 accepted as Laevides rapax (Thorne, 1939)
- Species Nygolaimus scalprum Heyns, 1968
- Species Nygolaimus seguranus Pena-Santiago & Liebanas, 1997
- Species Nygolaimus shadini Filipjev, 1928 accepted as Aquatides shadini (Filipjev, 1928)
- Species Nygolaimus shahrekordiensis Olia, Ahmad, Choudhary & Jairajpuri, 2004
- Species Nygolaimus similis Liebanas & Pena-Santiago, 1997
- Species Nygolaimus solaniphilus Sabova, 1974
- Species Nygolaimus spiralis Loos, 1946 accepted as Solididens spiralis (Loos, 1946)
- Species Nygolaimus tenuis Thorne, 1930
- Species Nygolaimus teres Thorne, 1930 accepted as Paravulvus teres (Thorne, 1930)
- Species Nygolaimus thornei Schneider, 1937 accepted as Aquatides thornei (Schneider, 1937)
- Species Nygolaimus timmi Heyns, 1968 accepted as Laevides timmi (Heyns, 1968)
- Species Nygolaimus trichodorus Andrássy, 1965 accepted as Solididens trichodorus (Andrássy, 1965)
- Species Nygolaimus trophurus Heyns, 1968 accepted as Clavicaudoides trophurus (Heyns, 1968)
- Species Nygolaimus vulgaris Thorne, 1930 accepted as Solididens vulgaris (Thorne, 1930)
- Species Nygolaimus xosorum Heyns, 1968 accepted as Solididens xosorum (Heyns, 1968)
- Genus Nygolaimus Cobb, 1913
- Genus Paranygolaimus Heyns, 1968
- Genus Paravulvus Heyns, 1968
- Genus Solididens Heyns, 1968
- Family Opailaimidae accepted as Belondiridae Thorne, 1939
- Family Oxydiridae Thorne, 1964 accepted as Belondiridae Thorne, 1939
- Family Paractinolaimidae Thorne, 1967 accepted as Actinolaimidae Thorne, 1939
- Family Pararhyssocolpidae Elshishka, Lazarova, Radoslavov, Hristov & Peneva, 2015
- Family Paraxonchiidae Dhanachand & Jairajpuri, 1981
- Family Prodorylaimidae Andrássy, 1969 accepted as Dorylaimidae de Man, 1876
- Family Pungentidae Monteiro, 1970 accepted as Nordiidae Siddiqi, 1969
- Family Quadsianematidae accepted as Qudsianematidae Jairajpuri, 1965
- Family Qudsianematidae Jairajpuri, 1965
- Family Roqueidae Thorne, 1964 accepted as Belondiridae Thorne, 1939
- Family Swangeriidae Jairajpuri, 1964 accepted as Belondiridae Thorne, 1939
- Family Thornenematidae Siddiqi, 1969
- Family Thorniidae De Coninck, 1965 accepted as Qudsianematidae Jairajpuri, 1965
- Family Trachypleurosidae Thorne, 1967
- Family Tylencholaimellidae Jairajpuri, 1964
- Family Tylencholaimidae Filipjev, 1934
- Family Tyleptidae Monteiro, 1970 accepted as Leptonchidae Thorne, 1935
- Family Xiphinematidae Dalmasso, 1969
- Order Isolaimida accepted as Mermithida
- Order Marimermithida
- Order Mermithida
- Order Mononchida
- Order Muspiceida
- Order Trichocephalida
- 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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