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
- Family Acugutturidae Hunt, 1980
- Family Alirhabditidae Suryawanshi, 1971
- Family Allantonematidae Pereira, 1931
- Family Alloionematidae Chitwood & McIntosh, 1934
- Family Anandranematidae Poinar, Jackson, Bell & Wahid, 2002 accepted as Allantonematidae Pereira, 1931
- Family Anguinidae Nicoll, 1935
- Family Aphalenchoididae accepted as Aphelenchoididae Skarbilovich, 1947
- Family Aphelenchidae Fuchs, 1937
- Family Aphelenchoididae Skarbilovich, 1947
- Genus Acugutturus Hunt, 1980
- Genus Anomyctus Allen, 1940
- Genus Aphelenchoides Fischer, 1894
- Genus Aphelenchoïdes Fischer, 1894 accepted as Aphelenchoides Fischer, 1894
- Genus Aprutides Scognamiglio, Talamé & s'Jacob, 1970
- Genus Asteroaphelenchoides Drozdovsky, 1967 accepted as Aphelenchoides Fischer, 1894
- Genus Basilaphelenchus Pedram, Kanzaki, Giblin-Davis & Pourjam, 2018
- Genus Berntsenus Massey, 1974
- Genus Bursaphelenchus Fuchs, 1937
- Genus Caballeroides Chaturvedi & Khera, 1977 accepted as Ektaphelenchus Fuchs, 1937
- Genus Chalcidonema Poinar, 2011 †
- Genus Chitinoaphelenchus Micoletzky, 1922 accepted as Aphelenchoides Fischer, 1894
- Genus Chitinoaphelencus Micoletzky, 1922 accepted as Aphelenchoides Fischer, 1894
- Genus Cretaciaphelenchoides Poinar, 2011 †
- Genus Cryptaphelenchoides Goodey, 1960 accepted as Ektaphelenchus Fuchs, 1937
- Genus Cryptaphelenchus Fuchs, 1937
- Genus Devibursaphelenchus Kakuliya, 1967 accepted as Bursaphelenchus Fuchs, 1937
- Genus Ectaphelenchus accepted as Ektaphelenchus Fuchs, 1937
- Genus Ektaphelenchoides Baujard, 1984
- Genus Ektaphelenchus Fuchs, 1937
- Genus Huntaphelenchoides Nickle, 1970 accepted as Bursaphelenchus Fuchs, 1937
- Genus Indaphelenchus Bajaj, Bishnoi & Dabur, 1995 accepted as Seinura Fuchs, 1931
- Genus Ipsaphelenchus Lieutier & Laumond, 1978 accepted as Bursaphelenchus Fuchs, 1937
- Genus Ipspahelenchus Lieutier & Laumond, 1978 accepted as Bursaphelenchus Fuchs, 1937
- Genus Isaphelenchus Lieutier & Laumond, 1978
- Genus Japanema Pedram in Moosavi, Aliramaji, Pourjam & Pedram, 2014
- Genus Laimaphelenchus Fuchs, 1937
- Genus Lenisaphelenchus Kanzaki & Hamaguchi, 2020
- Genus Noctuidonema Remillet & Silvain, 1988
- Genus Oligaphelenchoides Poinar, 1977 †
- Genus Oligoaphelenchoides Poinar, 1977
- Genus Oligodiplogaster Poinar, 1977
- Genus Omemeea Massey, 1971 accepted as Bursaphelenchus Fuchs, 1937
- Genus Palaeoaphelenchoides Poinar, 2011 †
- Genus Paraphelenchoides Haque, 1967 accepted as Aphelenchoides Fischer, 1894
- Genus Paraseinura Timm, 1960
- Genus Pathoaphelenchoides
- Genus Pathoaphelenchus Cobb, 1927 accepted as Aphelenchoides Fischer, 1894
- Genus Potensaphelenchus Gu, Liu, Abolafia & Pedram, 2021 †
- Genus Praecocilenchus Poinar, 1969 †
- Genus Pseudaphelenchoides Drozdovsky, 1967 accepted as Aphelenchoides Fischer, 1894
- Genus Pseudaphelenchus Kanzaki & Giblin-Davis, 2009
- Genus Pseudoaphelenchoides
- Genus Ptychaphelenchus Hodda, 2009
- Genus Punchaulus De Ley & Coomans, 1996
- Species Punchaulus gemellensis de Ley & Coomans, 1996
- Genus Roveaphelenchus Nickle, 1970 †
- Genus Ruehmaphelenchus Goodey, 1963
- Genus Ruidosaphelenchus Laumond & Carle, 1971 accepted as Laimaphelenchus Fuchs, 1937
- Genus Schistonchus Cobb, 1927
- Genus Seineura Fuchs, 1931 accepted as Seinura Fuchs, 1931
- Genus Seinura Fuchs, 1931
- Genus Sheraphelenchus Nickle, 1970
- Genus Steineria Fuchs, 1937 accepted as Cryptaphelenchus Fuchs, 1937
- Genus Teragramia Massey, 1974 accepted as Bursaphelenchus Fuchs, 1937
- Genus Vampyronema Hunt, 1993
- Family Atylenchidae Skarbilovich, 1959
- Family Belonolaimidae Whitehead, 1959
- Family Berntsenidae Hodda, 2003
- Family Bicirronematidae Andrássy, 1978
- Family Boleodoridae Khan, 1964
- Family Caloosiidae Siddiqi, 1980 accepted as Hemicycliophoridae Skarbilovich, 1959
- Family Cephalobidae Filipjev, 1934
- Family Contortylenchidae Rühm, 1956 accepted as Allantonematidae Pereira, 1931
- Family Criconematidae Taylor, 1936
- Family Dolichodoridae Chitwood & Chitwood, 1950
- Family Ecphyadophoridae Skarbilovich, 1959
- Family Ektaphelenchidae Paramonov, 1964
- Family Elaphonematidae Heyns, 1962
- Family Entaphelenchidae Nickle, 1970
- Family Fergusobiidae accepted as Neotylenchidae Thorne, 1941
- Family Hemicycliophoridae Skarbilovich, 1959
- Family Heteroderidae Filipjev, 1934
- Family Hoplolaimidae Filipjev, 1934
- Family Interrotylenchidae Eroshenko, 1984 accepted as Hoplolaimidae Filipjev, 1934
- Family Iotonchiidae Goodey, 1953
- Family Meiodoridae Siddiqi, 1976 accepted as Telotylenchidae Siddiqi, 1960
- Family Meloidogynidae Skarbilovich, 1959
- Family Merliniidae Siddiqi, 1971
- Family Metacrobelidae Andrássy, 1974
- Family Myenchidae Pereira, 1931
- Family Naccobidae Chitwood in Chitwood & Chitwood, 1950 accepted as Pratylenchidae Thorne, 1949
- Family Nemonchidae Skarbilovich, 1959 accepted as Hoplolaimidae Filipjev, 1934
- Family Neoaplectanidae Sobolev, 1953 accepted as Steinernematidae Chitwood & Chitwood, 1937
- Family Neotylenchidae Thorne, 1941
- Family Osstellidae Heyns, 1962
- Family Ostellidae accepted as Osstellidae Heyns, 1962
- Family Panagrolaimidae Thorne, 1937
- Family Pangrolaimidae accepted as Panagrolaimidae Thorne, 1937
- Family Paraphelenchidae Goodey, 1951
- Family Pararotylenchidae Bladwin & Bell, 1981 accepted as Hoplolaimidae Filipjev, 1934
- Family Parasitaphelenchidae Ruehm, 1956
- Family Parasitylenchidae Siddiqi, 1986
- Family Paratylenchidae Thorne, 1949
- Family Paurodontidae Thorne, 1941 accepted as Neotylenchidae Thorne, 1941
- Family Phaenopsitylenchidae Blinova & Korentchenko, 1986 accepted as Neotylenchidae Thorne, 1941
- Family Pratylenchidae Thorne, 1949
- Family Psilenchidae Paramonov, 1967
- Family Radopholidae Allen & Sher, 1967 accepted as Pratylenchidae Thorne, 1949
- Family Rhabdiasidae Railliet, 1916
- Family Rotylenchulidae Husain & Khan, 1967
- Family Seinuridae Husain & Khan, 1967
- Family Shahnematidae Siddiqi, 2014 accepted as Panagrolaimidae Thorne, 1937
- Family Sphaeronematidae Raski & Sher, 1952
- Family Sphaerulariidae Lubbock, 1861
- Family Steinernematidae Chitwood & Chitwood, 1937
- Family Strongyloididae Chitwood & McIntosh, 1934
- Family Sychnotylenchidae Paramonov, 1967
- Family Telotylenchidae Siddiqi, 1960
- Family Tylenchidae Örley, 1880
- Family Tylenchocriconematidae Raski & Siddiqi, 1975 accepted as Tylenchulidae Skarbilovitch, 1947
- Family Tylenchorhychidae accepted as Telotylenchidae Siddiqi, 1960
- Family Tylenchorhynchidae Eliava, 1964 accepted as Telotylenchidae Siddiqi, 1960
- Family Tylenchulidae Skarbilovitch, 1947
- Family Tylenorhynchidae accepted as Telotylenchidae Siddiqi, 1960
- Family Tylodoridae Paramonov, 1967
- Order Plectida
- Order Rhabditida
- Order Selachinematida
- Order Spirurida
- 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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