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
- Genus Antarctylus Sher, 1973
- Genus Aorolaimus Sher, 1963
- Genus Aphasmatylenchus Sher, 1965
- Genus Bairolaimus accepted as Hoplolaimus Daday, 1905
- Genus Basirolaimus Shamsi, 1979 accepted as Hoplolaimus Daday, 1905
- Genus Calvatylus Jairajpuri & Siddiqi, 1977 † accepted as Rotylenchus Filipjev, 1936
- Genus Croserinema Khan, Chawla & Saha, 1976 accepted as Ogma Southern, 1914
- Genus Ethiolaimus Siddiqi, 2000 accepted as Hoplolaimus Daday, 1905
- Genus Gottholdsteineria Andrássy, 1958 accepted as Rotylenchus Filipjev, 1936
- Genus Helicotylenchus Steiner, 1945
- Genus Helicotylencjus
- Genus Homogma Siddiqi Tylenchida, 1986 accepted as Crossonema Mehta & Raski, 1971
- Genus Hoploaimus accepted as Hoplolaimus Daday, 1905
- Genus Hoplolaimoides Shakil, 1973 accepted as Hoplolaimus Daday, 1905
- Genus Hoplolaimus Daday, 1905
- Species Hoplolaimus abelmoschi Tandon & Singh, 1973 accepted as Basirolaimus abelmoschi (Tandon & Singh, 1973)
- Species Hoplolaimus aberrans Whitehead, 1960 accepted as Scutellonema clathricaudatum Whitehead, 1959
- Species Hoplolaimus aegypti Shafiee & Koura, 1970 accepted as Basirolaimus aegypti (Shafiee & Koura, 1970)
- Species Hoplolaimus angustalatus
- Species Hoplolaimus annulifer de Man, 1921 accepted as Criconema annuliferum (de Man, 1921)
- Species Hoplolaimus aorolaimoides Siddiqi, 1972
- Species Hoplolaimus arachidis Maharaju & Das, 1982 accepted as Basirolaimus indicus (Sher, 1963)
- Species Hoplolaimus bradys Steiner & LeHew, 1933 accepted as Scutellonema bradys
- Species Hoplolaimus californicus Sher, 1963
- Species Hoplolaimus capensis Van den Berg & Heyns, 1970 accepted as Ethiolaimus capensis (Van den Berg & Heyns, 1970)
- Species Hoplolaimus casparus Van den Berg & Heyns, 1970 accepted as Ethiolaimus casparus (Van den Berg & Heyns, 1970)
- Species Hoplolaimus caudifurcatus Tiwara, Mishra & Malhotra, 2001
- Species Hoplolaimus cephalus Mulk & Jairajpuri, 1976 accepted as Basirolaimus cephalus (Mulk & Jairajpuri, 1976)
- Species Hoplolaimus chambus Jairajpuri & Baqri, 1973 accepted as Basirolaimus chambus (Jairajpuri & Baqri, 1973)
- Species Hoplolaimus clarissimus Fortuner, 1973 accepted as Basirolaimus clarissimus (Fortuner, 1973)
- Species Hoplolaimus columbus Sher, 1963 accepted as Basirolaimus columbus (Sher, 1963)
- Species Hoplolaimus concaudajuvencus Golden & Minton, 1970
- Species Hoplolaimus coronatus Cobb, 1923 accepted as Hoplolaimus galeatus
- Species Hoplolaimus diadematus Hunt & Freire, 1994 accepted as Ethiolaimus diadematus (Hunt & Freire, 1994)
- Species Hoplolaimus dimorphicus Mulk & Jairajpuri, 1976 accepted as Basirolaimus dimorphicus (Mulk & Jairajpuri, 1976)
- Species Hoplolaimus dubius Chaturvedi, Singh & Khera in Chaturvedi & Khera, 1979 accepted as Basirolaimus dubius (Chaturvedi, Singh & Khera in Chaturvedi & Khera, 1979)
- Species Hoplolaimus gadsdenensis Thames in Sher, 1963
- Species Hoplolaimus galeatus
- Species Hoplolaimus gracilidens Sauer, 1958 accepted as Rotylenchus gracilidens (Sauer, 1958)
- Species Hoplolaimus igualaensis Cid Del Prado V., 1994
- Species Hoplolaimus imphalensis Khan & Khan, 1985
- Species Hoplolaimus indicus Sher, 1963 accepted as Basirolaimus indicus (Sher, 1963)
- Species Hoplolaimus informis Micoletzky, 1922 accepted as Criconemoides informis (Micoletzky, 1922)
- Species Hoplolaimus intermedius (Suryawanshi, 1971)
- Species Hoplolaimus johani Tiwara, Mishra & Malhotra, 2001
- Species Hoplolaimus jonesi Kumar, 1981 accepted as Basirolaimus jonesi (Kumar, 1981)
- Species Hoplolaimus kittenbergeri Andrássy, 1961 accepted as Ethiolaimus pararobustus (Schuurmans Stekhoven & Teunissen, 1938)
- Species Hoplolaimus leiomerus de Guiran, 1963 accepted as Aorolaimus leiomerus (de Guiran, 1963)
- Species Hoplolaimus maggentii Cid Del Prado V., 1994 accepted as Basirolaimus maggentii (Cid-Del-Prado-V, 1994)
- Species Hoplolaimus magnistylus Robbins, 1982
- Species Hoplolaimus menzeli Stefanski, 1924 accepted as Crossonema menzeli (Stefanski, 1924)
- Species Hoplolaimus neocoronatus Whitten in Sher, 1961
- Species Hoplolaimus peruensis Steiner, 1920 accepted as Macroposthonia peruensis (Steiner, 1920)
- Species Hoplolaimus proporicus Goodey, 1957 accepted as Ethiolaimus pararobustus (Schuurmans Stekhoven & Teunissen, 1938)
- Species Hoplolaimus puertoricensis Ramirez, 1964 accepted as Basirolaimus puertoricensis (Ramirez, 1964)
- Species Hoplolaimus sanwali Kumar, 1981 accepted as Basirolaimus sanwali (Kumar, 1981)
- Species Hoplolaimus seinhorsti Luc, 1958 accepted as Basirolaimus seinhorsti (Luc, 1958)
- Species Hoplolaimus seshadrii Mulk & Jairajpuri, 1976 accepted as Basirolaimus seshadrii (Mulk & Jairajpuri, 1976)
- Species Hoplolaimus sheri Suryawanshi, 1971 accepted as Basirolaimus seinhorsti (Luc, 1958)
- Species Hoplolaimus sinensis Rahm, 1937 accepted as Criconemoides sinensis (Rahm, 1937)
- Species Hoplolaimus singhi Das & Shivaswamy, 1977 accepted as Basirolaimus singhi (Das & Shivaswamy, 1977)
- Species Hoplolaimus steineri Kannan, 1961 accepted as Basirolaimus steineri (Kannan, 1961)
- Species Hoplolaimus stephanus Sher, 1963
- Species Hoplolaimus tabacum Firoza, Nasira & Maqbool, 1990 accepted as Basirolaimus tabacum (Firoza, Nasira & Maqbool, 1990)
- Species Hoplolaimus thienemanni Schneider, 1925 accepted as Loofia thienemanni (Schneider, 1925)
- Species Hoplolaimus tylenchiformis Daday, 1905
- Species Hoplolaimus uasi Sharma, Edward & Krishnappa, 1983
- Species Hoplolaimus uniformis Thorne, 1949 accepted as Rotylenchus robustus (de Man, 1876)
- Species Hoplolaimus zavadskii Tulaganov, 1941 accepted as Criconemella zavadskii (Tulaganov, 1941)
- Genus Hoplonema Ivanova & Tebenkova, 1992
- Genus Interrotylenchus Eroshenko, 1984 accepted as Rotylenchus Filipjev, 1936
- Genus Leiperotylenchus Manohar Das, 1960 accepted as Rotylenchulus Linford & Oliveira, 1940
- Genus Macrocriconema Minagawa, 1986 accepted as Ogma Southern, 1914
- Genus Nectopelta Siddiqi Tylenchida, 1986 accepted as Peltamigratus Sher, 1963
- Genus Nemonchus Cobb, 1913 accepted as Hoplolaimus Daday, 1905
- Genus Neocrossonema Ebsary, 1981 accepted as Crossonema Mehta & Raski, 1971
- Genus Ogama accepted as Ogma Southern, 1914
- Genus Orientylus Jairajpuri & Siddiqi, 1977
- Genus Orphreyus Siddiqi, 2000 accepted as Ogma Southern, 1914
- Genus Pararotylenchus Baldwin & Bell, 1981 accepted as Rotylenchus Filipjev, 1936
- Genus Pateracephalanema Mehta & Raski, 1971 accepted as Ogma Southern, 1914
- Genus Pellipecten Siddiqi Tylenchida, 1986 accepted as Ogma Southern, 1914
- Genus Peltamigratus Sher, 1963
- Genus Plesiorotylenchus Vovlas, Castillo & Lamberti, 1993 accepted as Rotylenchus Filipjev, 1936
- Genus Pseudocriconema Minagawa, 1984 accepted as Ogma Southern, 1914
- Genus Rotylenchoides Whitehead, 1958
- Genus Rotylenchus Filipjev, 1934
- Genus Rotylenchus Filipjev, 1936
- Genus Scutellonema Andrássy, 1958
- Genus Scutellonemoides Eroshenko, 1984 accepted as Rotylenchus Filipjev, 1936
- Genus Scuttellonema accepted as Scutellonema Andrássy, 1958
- Genus Seriespinula Mehta & Raski, 1971 accepted as Ogma Southern, 1914
- Genus Spirotylenchus Lordella & Cesnik, 1958 accepted as Rotylenchulus Linford & Oliveira, 1940
- Genus Spyrotylenchus Lordello & Cesnik, 1958 accepted as Rotylenchulus Linford & Oliveira, 1940
- Genus Syro Orton Williams, 1985 accepted as Ogma Southern, 1914
- Genus Variasquamata Mehta & Raski, 1971 † accepted as Ogma Southern, 1914
- Genus Varotylus Siddiqi Tylenchida, 1986
- Genus Zimmermannia Shamsi, 1973 accepted as Helicotylenchus Steiner, 1945
- 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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