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
- 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
- Family Anguillulidae
- Family Carabonematidae Stammer & Wachek, 1952
- Family Cephalobiidae Travassos & Kloss, 1960
- Family Chambersiellidae Thorne, 1937
- Family Cylindrocorporidae Goodey, 1939
- Family Daubayliidae Chitwood & Chitwood, 1934 accepted as Myolaimidae Goodey, 1963
- Family Diplogasteridae Micoletzky, 1922
- Genus Acrostichus Rahm, 1928
- Genus Adenticum Gantait & Chatterjee, 2007 accepted as Cephalobium Cobb, 1920
- Genus Aduncospiculum Giblin & Kaya, 1984 accepted as Acrostichus Rahm, 1928
- Genus Aenigmenchus De Ley, Coomans & Geraert, 1994
- Genus Allodiplogaster Paramonov, 1952
- Genus Allodiplogaster Paramonov & Sobolev in Skrjabin, Shikhobalova, Sobolev, Paramonov & Sudarikov, 1954 accepted as Koerneria Meyl, 1960
- Genus Amphidiplogasteroides Ruhm in Körner, 1954 accepted as Diplogasteroides de Man, 1912
- Genus Anchidiplogaster Paramov, 1952 accepted as Koerneria Meyl, 1960
- Genus Anchidiplogasteroides Paramonov & Turlingina, 1955 accepted as Rhabditidoides Rahm, 1928
- Genus Butleriellus Meyl, 1960 accepted as Butlerius Goodey, 1929
- Genus Butlerioides Lordello & Zamith, 1959 accepted as Butlerius Goodey, 1929
- Genus Butlerius Goodey, 1929
- Genus Cephalobium Cobb, 1920
- Genus Ceratosolenus Rajeswari Anand, 2005
- Genus Chitinotylenchoides Aries & Jimenez-Millan, 1968 accepted as Tylopharynx Man, 1876
- Genus Chroniodiplogaster Poinar, 1990 accepted as Pristionchus Kreis, 1932
- Genus Costanemella Andrassy, 2001
- Genus Cutidiplogaster Fürst von Lieven, Uni & Bain, 2011
- Genus Demania Steiner, 1914 accepted as Demaniella Steiner, 1914
- Genus Demaniella Steiner, 1914
- Genus Denticum Gantait & Chatterjee, 2007 accepted as Cephalobium Cobb, 1920
- Genus Diplogaster Schultze in Carus, 1857
- Genus Diplogasterellus
- Genus Diplogasteriana Meyl, 1960
- Genus Diplogasteritus Paramonov, 1952
- Genus Diplogasterium Paramonov, 1952 accepted as Pristionchus Kreis, 1932
- Genus Diplogastrellus Paramonov, 1952
- Genus Diplogastrellus Weingärtner, 1955 accepted as Diplogaster Schultze in Carus, 1857
- Genus Eudiplogaster Weingärtner, 1955 accepted as Diplogaster Schultze in Carus, 1857
- Genus Eudiplogasterium Meyl, 1960 accepted as Fictor Paramonov, 1952
- Genus Filipjevella Lazarevskaya, 1965 † accepted as Acrostichus Rahm, 1928
- Genus Fuchsia Micoletzky, 1922 accepted as Micoletzkya
- Genus Fuchsnema Andrássy, 1984 accepted as Diplogasteroides de Man, 1912
- Genus Gerthornus Massey, 1966 accepted as Micoletzkya
- Genus Glauxinemella Gagarin, 1998 accepted as Koerneria Meyl, 1960
- Genus Gobindonema Khera, 1970 accepted as Koerneria Meyl, 1960
- Genus Goffartia Hirschmann, 1952
- Genus Gubalonus Siddiqi, 2014
- Genus Gynopoecilia Chabaud, Golvan, Bain & Brygoo, 1965
- Genus Hemidiplogaster Goodey, 1963
- Species Hemidiplogaster agilis
- Genus Heteropleuronema Andrassy, 1970
- Genus Holodiplogaster Meyl, 1960 accepted as Fictor Paramonov, 1952
- Genus Hugotdiplogaster
- Genus Isacis Diesing, 1861 accepted as Pristionchus Kreis, 1932
- Genus Isakis Lespès, 1856 accepted as Pristionchus Kreis, 1932
- Genus Kerneria Meyl, 1960 accepted as Koerneria Meyl, 1960
- Genus Koernaria
- Genus Koerneria Meyl, 1960
- Genus Leptojacobus Kanzaki, Ragsdale, Susoy & Sommer, 2014
- Genus Levipalatum Ragsdale, Kanzaki & Sommer, 2014
- Genus Loxolaimus Rahm, 1930
- Genus Lycolaimus Rahm, 1928 accepted as Pristionchus Kreis, 1932
- Genus Masseyus Paramonov, 1964 accepted as Diplogasteroides de Man, 1912
- Genus Mehdinema Farooqui, 1967
- Genus Mesodiplogaster Goodey, 1963 accepted as Pristionchus Kreis, 1932
- Genus Mesodiplogaster Körner, 1954 accepted as Pristionchus Kreis, 1932
- Genus Mesodiplogasteroides Khera, 1969 accepted as Butlerius Goodey, 1929
- Genus Metadiplogaster Meyl, 1961
- Genus Metadiplogaster Weingärtner, 1955 accepted as Diplogastrellus Paramonov, 1952
- Genus Micoletzkya
- Genus Micoletzkyella Weingärtner, 1955 accepted as Micoletzkya
- Genus Mikoletzkya Weingärtner, 1955 accepted as Micoletzkya
- Genus Monobutlerius Andrassy, 1984 accepted as Butlerius Goodey, 1929
- Genus Monochoides
- Genus Myctolaimellus Andrássy, 1984 accepted as Myctolaimus Cobb, 1920
- Genus Neodiplogaster Cobb, 1924
- Genus Neodiplogasteroides Rühm, 1956 accepted as Diplogasteroides de Man, 1912
- Genus Noteodiplogaster de Villalobos, Camino & Reboredo, 1998
- Genus Odontopharyx accepted as Odontopharynx de Man, 1912
- Genus Parabutlerius Ebsary, 1986 accepted as Butlerius Goodey, 1929
- Genus Paradiplogaster Paramonov, 1952 accepted as Fictor Paramonov, 1952
- Genus Paradiplogaster Stekhoven & Tennisson, 1938 accepted as Pristionchus Kreis, 1932
- Genus Paradiplogaster Weingärtner, 1955 accepted as Paroigolaimella Paramonov, 1952
- Genus Paradoxogaster Khera, 1970 accepted as Fictor Paramonov, 1952
- Genus Paraigolaimella accepted as Paroigolaimella Paramonov, 1952
- Genus Paramonoviola Blinova & Vosilite, 1976 accepted as Pristionchus Kreis, 1932
- Genus Paramonovnema Andrassy, 1968 accepted as Goffartia Hirschmann, 1952
- Genus Parapristionchus Kanzaki, Ragsdale, Herrmann, Mayer, Tanaka & Sommer, 2012
- Genus Parasitodiplogaster Poinar, 1979
- Genus Paroigolaimella Paramonov, 1952
- Genus Peronilaimus Rahm, 1928 accepted as Pristionchus Kreis, 1932
- Genus Peterngus Ahmad, Ahmad & Mahamood, 2004
- Genus Prosodontus
- Genus Proterodiplogasteroides accepted as Pseudodiplogasteroides Körner, 1954
- Genus Pseudodiplogaster Takaki, 1941 accepted as Diplogasteroides de Man, 1912
- Genus Rhabditidoides Rahm, 1928
- Genus Rhabditolaimus Fuchs, 1915
- Genus Rhabdontolaimus Fuchs, 1931
- Genus Sachsia Meyl, 1960
- Genus Sudhausia Herrmann, Ragsdale, Kanzaki & Sommer, 2013
- Genus Syedella Suryawanshi, 1971
- Genus Tawdenema Suryawanshi, 1971
- Genus Teratodiplogaster Kanzaki, Giblin-Davis, Davies, Ye, Center & Thomas, 2009
- Genus Titilleus Siddiqi, 2014
- Genus Tridontus Khera, 1965 accepted as Mononchoides Rahm, 1928
- Genus Tylenchodon Fuchs, 1930 accepted as Neodiplogaster Cobb, 1924
- Genus Zullinius Andrássy, 1984 accepted as Odontopharynx de Man, 1912
- Family Diplogasteroididae Paramonov, 1952
- Family Diplogastridae accepted as Diplogasteridae Micoletzky, 1922
- Family Diplogastroidea incertae sedis
- Family Myolaimidae Goodey, 1963
- Family Neodiplogasteridae Paramonov, 1952
- Family Pseudodiplogasteroididae De Ley & Blaxter, 2002
- Family Tylopharyngidae Filipjev, 1918
- Order Draconematina accepted as Desmodorida
- Order Drilonematida
- Order Filariidea accepted as Spirurida
- Order Leptolaimida
- Order Monhysterida
- Order Oxyurida accepted as Spirurida
- Order Panagrolaimida
- 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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