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
- 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
- Genus Anguillonema Fuchs, 1938
- Genus Aphanitylenchus Rubtsov, 1981 accepted as Psyllotylenchus Poinar & Nelson, 1973
- Genus Helionema Brzeski, 1962
- Genus Heteromorphotylenchus Remillet & Van Waerebeke, 1978
- Genus Heterotylenchus Bovien, 1937
- Genus Incurvinema Deunff, Launay & Beaucornu, 1985
- Genus Kurochkinitylenchus Slobodyanyuk, 1999
- Genus Neonema Pawlowsky, 1938 accepted as Psyllotylenchus Poinar & Nelson, 1973
- Genus Parasitylenchus Micoletzky, 1922
- Species Parasitylenchus aculeatus Slankis, 1972
- Species Parasitylenchus athetae Wachek, 1955 accepted as Proparasitylenchus athetae (Wachek, 1955)
- Species Parasitylenchus avulsi Massey, 1958 accepted as Neoparasitylenchus avulsi (Massey, 1958)
- Species Parasitylenchus betulae Rühm, 1956 accepted as Neoparasitylenchus betulae (Rühm, 1956)
- Species Parasitylenchus boopini Wachek, 1955 accepted as Metaparasitylenchus boopini (Wachek, 1955)
- Species Parasitylenchus caudapilli Tomalak, 1984
- Species Parasitylenchus chalcographi Fuchs, 1938 accepted as Sulphuretylenchus sulphureus (Fuchs, 1938)
- Species Parasitylenchus coccinellinae Iperti & van Waerebeke, 1968
- Species Parasitylenchus coronatus Massey, 1974 accepted as Neoparasitylenchus coronatus (Massey, 1974)
- Species Parasitylenchus cossoni Wulker, 1929 accepted as Metaparasitylenchus cossoni (Wulker, 1929)
- Species Parasitylenchus cryptophagi Wachek, 1955 accepted as Metaparasitylenchus cryptophagi (Wachek, 1955)
- Species Parasitylenchus curvidentis (Fuchs, 1914)
- Species Parasitylenchus diplogenus Welch, 1959
- Species Parasitylenchus elongatus Massey, 1958 accepted as Sulphuretylenchus elongatus (Massey, 1958)
- Species Parasitylenchus escherichi Rühm, 1956 accepted as Sulphuretylenchus escherichi (Rühm, 1956)
- Species Parasitylenchus fuchsi Rühm, 1956 accepted as Sulphuretylenchus fuchsi (Rühm, 1956)
- Species Parasitylenchus grosmannae Rühm, 1954 accepted as Sulphuretylenchus grosmannae (Rühm, 1954)
- Species Parasitylenchus helmidis Wachek, 1955 accepted as Metaparasitylenchus helmidis (Wachek, 1955)
- Species Parasitylenchus hylastis (Wülker, 1923)
- Species Parasitylenchus hylurgi Filipjev, 1934 accepted as Neoparasitylenchus hylastis (Wulker, 1923)
- Species Parasitylenchus ipinus Massey, 1974 accepted as Neoparasitylenchus ipinus (Massey, 1974)
- Species Parasitylenchus kleinei Rühm, 1956 accepted as Sulphuretylenchus kleinei (Rühm, 1956)
- Species Parasitylenchus klimenkorum Korenchenko, 1987
- Species Parasitylenchus leperisini Massey, 1974 accepted as Metaparasitylenchus leperisini (Massey, 1974)
- Species Parasitylenchus macrobursatus Blinova & Gurando, 1977
- Species Parasitylenchus medonis Wachek, 1955 accepted as Proparasitylenchus medonis (Wachek, 1955)
- Species Parasitylenchus mycetophagi Wachek, 1955 accepted as Metaparasitylenchus mycetophagi (Wachek, 1955)
- Species Parasitylenchus myrmedoniae Wachek, 1955 accepted as Proparasitylenchus myrmedoniae (Wachek, 1955)
- Species Parasitylenchus nearcticus Poinar, Jaenike & Dombeck, 1997
- Species Parasitylenchus oriundus Massey, 1974 accepted as Neoparasitylenchus oriundus (Massey, 1974)
- Species Parasitylenchus orthotomici Ho-Yul-Choo, Kaya & Shea, 1989
- Species Parasitylenchus orthotomici Rühm, 1960 accepted as Neoparasitylenchus orthotomici (Rühm, 1960)
- Species Parasitylenchus oschei Rühm, 1956 accepted as Metaparasitylenchus oschei (Rühm, 1956)
- Species Parasitylenchus ovarius Massey, 1958 accepted as Neoparasitylenchus ovarius (Massey, 1958)
- Species Parasitylenchus oxyteli Wachek, 1955 accepted as Proparasitylenchus oxyteli (Wachek, 1955)
- Species Parasitylenchus parasitus Massey, 1974 accepted as Neoparasitylenchus parasitus (Massey, 1974)
- Species Parasitylenchus pessoni Rühm in Rühm & Chararas, 1957 accepted as Neoparasitylenchus pessoni (Rühm in Rühm & Chararas, 1957)
- Species Parasitylenchus pilifrons Massey, 1958 accepted as Sulphuretylenchus pilifrons (Massey, 1958)
- Species Parasitylenchus pityophtori Rühm, 1956 accepted as Neoparasitylenchus pityophtori (Rühm, 1956)
- Species Parasitylenchus platystethi Wachek, 1955 accepted as Proparasitylenchus platystethi (Wachek, 1955)
- Species Parasitylenchus poligraphi Fuchs, 1938 accepted as Neoparasitylenchus poligraphi (Fuchs, 1938)
- Species Parasitylenchus pusilli Fuchs, 1938 accepted as Neoparasitylenchus cinerei (Fuchs, 1929)
- Species Parasitylenchus rhizophagi Wachek, 1955 accepted as Metaparasitylenchus rhizophagi (Wachek, 1955)
- Species Parasitylenchus rugulosi Schvester, 1957 accepted as Neoparasitylenchus rugulosi (Schvester, 1957)
- Species Parasitylenchus scolyti Oldham, 1930 accepted as Neoparasitylenchus scolyti (Oldham, 1930)
- Species Parasitylenchus scrutillus Massey, 1974 accepted as Neoparasitylenchus scrutillus (Massey, 1974)
- Species Parasitylenchus secundus Fuchs, 1933 accepted as Neoparasitylenchus scolyti (Oldham, 1930)
- Species Parasitylenchus senicus Massey, 1974 accepted as Neoparasitylenchus senicus (Massey, 1974)
- Species Parasitylenchus stipatus Massey, 1966 accepted as Sulphuretylenchus stipatus (Massey, 1966)
- Species Parasitylenchus strangaliae Wachek, 1955 accepted as Metaparasitylenchus strangaliae (Wachek, 1955)
- Species Parasitylenchus sulphureus Fuchs, 1938 accepted as Sulphuretylenchus sulphureus (Fuchs, 1938)
- Species Parasitylenchus telmatophili Wachek, 1955 accepted as Metaparasitylenchus telmatophili (Wachek, 1955)
- Species Parasitylenchus tetropii Wachek, 1955 accepted as Metaparasitylenchus tetropii (Wachek, 1955)
- Species Parasitylenchus trogophoei Wachek, 1955 accepted as Proparasitylenchus trogophoei (Wachek, 1955)
- Species Parasitylenchus typographi (Fuchs, 1915)
- Species Parasitylenchus undulatus Massey, 1974 accepted as Sulphuretylenchus undulatus (Massey, 1974)
- Species Parasitylenchus wuelkeri Rühm, 1956 accepted as Neoparasitylenchus wuelkeri (Rühm, 1956)
- Species Parasitylenchus xylebori Schvester, 1950 accepted as Neoparasitylenchus xylebori (Schvester, 1950)
- Genus Paregletylenchus Slobodianiuc in Slobodyanyuk, 1984
- Genus Polymorphotylenchus Rühm, 1956 accepted as Parasitylenchus Micoletzky, 1922
- Genus Psyllotylenchus Poinar & Nelson, 1973
- Genus Robleus Massey, 1974
- Genus Spilotylenchus Launay, Deunff & Bain, 1983
- Genus Thylakolenchus Ruhm, 1956 accepted as Parasitylenchus Micoletzky, 1922
- Genus Vastotylenchus Slankis, 1967 accepted as Parasitylenchus Micoletzky, 1922
- Genus Wachekitylenchus Slobodianiuk, 1986
- Genus Wachekytylenchus accepted as Wachekitylenchus Slobodianiuk, 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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