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
- 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
- Genus Acusilenchus Shahina & Maqbool, 1990 accepted as Neopsilenchus Thorne & Malek, 1968
- Genus Allotylenchus Andrassy, 1984
- Genus Basiria Siddiqi, 1959
- Genus Basirienchus Geraert & Raski, 1985 accepted as Basiria Siddiqi, 1959
- Genus Basiroides Thorne & Malek, 1968 accepted as Basiria Siddiqi, 1959
- Genus Boleodorus Thorne, 1941
- Genus Cervoannulatus Bajaj, 1998
- Genus Clavilenchus Jairajpuri, 1966 accepted as Basiria Siddiqi, 1959
- Genus Cosaglenchus Siddiqui & Khan, 1983 accepted as Coslenchus Siddiqi, 1978
- Genus Coslenchus Siddiqi, 1978
- Genus Cucullitylenchus Huang & Raski, 1986
- Genus Discotylenchus Rafiq Siddiqi, 1980
- Genus Duosulcius Siddiqi, 1979
- Genus Duotylenchus Saha & Khan, 1982 accepted as Basiria Siddiqi, 1959
- Genus Dylenchus Chapais, 1909 accepted as Tylenchus Bastian, 1865
- Genus Filenchus Andrássy, 1954
- Genus Fraglenchus Siddiqi, 2000
- Genus Irantylenchus Kheiri, 1972
- Genus Labrys Qing & Bert, 2018
- Genus Malenchus Andrassy, 1968
- Genus Miculenchus Andrássy, 1959
- Genus Mukazia Siddiqi Tylenchida, 1986
- Genus Neobasiria Javed, 1982 accepted as Basiria Siddiqi, 1959
- Genus Neopsilenchus Thorne & Malek, 1968
- Genus Neothada Khan, 1973
- Genus Ottolenchus Husain & Khan, 1967
- Genus Paktylenchus Maqbool, 1983 accepted as Coslenchus Siddiqi, 1978
- Genus Paranguina Kiryanova, 1955
- Genus Polenchus Andrassy, 1980
- Species Polenchus curvicauda Raski & Geraert, 1988
- Species Polenchus minutus Lal & Mathur, 1996
- Species Polenchus politus Andrássy, 1980
- Species Polenchus shamimi Baqri, 1991
- Genus Pseudobasiria Jahan, 1986 accepted as Basiria Siddiqi, 1959
- Genus Rhabdotylenchus Xie, Feng, Li & Yin, 1994 accepted as Basiria Siddiqi, 1959
- Genus Ridgellus Siddiqi, 2000
- Genus Sakia Khan, 1964
- Genus Sigmolenchus Gharahkhani, Pourjam, Abolafia, Castillo & Pedram, 2020
- Genus Tanzanius Siddiqi, 1991
- Genus Thada Thorne, 1941
- Genus Tilenchus Huber, 1909 accepted as Tylenchus Bastian, 1865
- Genus Tylelenchus Bastian, 1865 accepted as Tylenchus Bastian, 1865
- Genus Tylenchus Bastian, 1865
- Genus Zanenchus Siddiqi, 1979
- 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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