Between brackets is the number of accepted species
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2 Shows the number of accepted species within the taxon
3 The last expanded taxon is highlighted
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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
- Order Plectida
- Order Rhabditida
- Family Ablechroiulidae Andrássy, 1976
- Family Agfidae Dougherty, 1955
- Family Amidostomatidae Baylis & Daubney, 1926
- Family Amphibiophilidae Durette-Desset & Chabaud, 1981 accepted as Trichostrongylidae Leiper, 1908
- Family Ancylostomatidae Looss, 1905
- Family Ancylostomidae accepted as Ancylostomatidae Looss, 1905
- Family Angiostomatidae Blanchard, 1895
- Family Angiostrongylidae Böhm & Gebauer, 1934 accepted as Metastrongylidae Leiper, 1908
- Family Brevibuccidae Paramonov, 1956
- Family Bunonematidae Paramonov, 1956
- Family Bunonemidae accepted as Bunonematidae Paramonov, 1956
- Family Chabertidae accepted as Chabertiidae Popova, 1952
- Family Chabertiidae Popova, 1952
- Family Cloacinidae Stossich, 1899 accepted as Chabertiidae Popova, 1952
- Family Cooperiidae Skrjabin & Schulz, 1937 accepted as Trichostrongylidae Leiper, 1908
- Family Crenosomatidae Schulz, 1951
- Family Cyathostomidae accepted as Strongylidae Baird, 1853
- Family Cyclicostrongylidae accepted as Diaphanocephalidae Travassos, 1920
- Family Deletrocephalidae Chitwood, 1969
- Family Diaphanocephalidae Travassos, 1920
- Family Dictyocaulidae Skrjabin, 1933
- Family Diploscapteridae Micoletzky, 1922
- Family Elaphostrongylidae Azimov, Akramova, Khusanov & Golovanov, 1999 accepted as Protostrongylidae Leiper, 1926
- Family Filarioididae accepted as Filaroididae Schulz, 1951
- Family Filaroididae Schulz, 1951
- Family Globocephalidae Travassos & Vogelsang, 1932 accepted as Ancylostomatidae Looss, 1905
- Family Haemonchidae Skrjabin & Schulz, 1937
- Family Heligmonellidae Skrjabin & Schikobalova, 1952
- Family Heligmosomidae Travassos, 1914
- Family Heligosomatidae accepted as Heligmosomidae Travassos, 1914
- Family Herpetostrongylidae Skrjabin & Schulz, 1937
- Family Heterohabditidae accepted as Heterorhabditidae Poinar, 1975
- Family Heterorhabditidae Poinar, 1975
- Family Ichthyostrongylidae
- Family Mackerrastrongylidae Inglis, 1968 accepted as Molineidae Skrjabin & Schulz, 1937
- Family Mesorhabditidae Andrássy, 1976
- Family Metastrongylidae Leiper, 1908
- Family Metastrongyloidea (awaiting allocation)
- Family Molineidae Skrjabin & Schulz, 1937
- Family Molinidae accepted as Molineidae Skrjabin & Schulz, 1937
- Family Nicollinidae Skrjabin & Schulz, 1937
- Family Odontopharyngidae Micoletzky, 1922
- Family Odontorhabditidae accepted as Rhabditidae Örley, 1880
- Family Ollulanidae
- Family Ornithostrongylidae Travassos, 1937
- Family Parasitorhabditidae Lazarevskaya, 1965
- Family Peloderidae Andrássy, 1976
- Family Pharyngostrongylidae
- Family Protostrongylidae Leiper, 1926
- Family Pseudaliidae Railliet & Henry, 1909
- Family Pterygorhabditidae Goodey, 1963
- Family Ransomnemidae Travassos, 1930 accepted as Ransomnematidae Travassos, 1930
- Family Rhabditida (awaiting allocation)
- Family Rhabditidae Örley, 1880
- Family Rhabditonematidae Andrássy, 1976
- Family Robertiidae Travassos & Kloss, 1960 accepted as Traklosiidae Bernard & Phillips, 2015
- Family Sclerostomidae Baird, 1853 accepted as Strongylidae Baird, 1853
- Family Skrjabingylidae Skrjabin, 1933
- Family Strongylacanthidae
- Family Strongylidae Baird, 1853
- Family Syngamidae Leiper, 1912
- Family Syrphonematidae Laumond & Lyon, 1971
- Family Traklosiidae Bernard & Phillips, 2015
- Family Trichonematidae accepted as Strongylidae Baird, 1853
- Family Trichostrongylidae Leiper, 1908
- Family Uncinariidae accepted as Ancylostomatidae Looss, 1905
- Family Viannaiidae Neveu-Lemaire, 1944
- Genus Avellaria Freitas & Lent, 1934
- Genus Brevispiculoides Ortlepp, 1939 accepted as Viannella Travassos, 1918
- Genus Camerostrongylus Wolfgang, 1950 accepted as Travassostrongylus Orloff, 1933
- Genus Heligmoskrjabinia Freitas & Lent, 1937 accepted as Oswaldonema Travassos, 1927
- Genus Hoineffia Diaw, 1977 † accepted as Viannaia Travassos, 1914
- Species Hoineffia cayennensis Diaw, 1976 † accepted as Viannaia cayennensis (Diaw, 1976)
- Species Hoineffia simplicispicula Navone, Suriano & Pujol, 1991 † accepted as Viannaia simplicispicula (Navone, Suriano & Pujol, 1991)
- Genus Hydrochoerisnema Arantes & Artigas, 1980
- Genus Ierestrongylus Cameron, 1935
- Genus Mazamanema Cameron, 1935 accepted as Mazanema Cameron, 1935
- Genus Mazanema Cameron, 1935
- Genus Nesomystrongylus Durette-Desset, Lethonen & Haukisalmi, 2002
- Genus Oswaldonema Travassos, 1927
- Genus Philostrongylus Wolfgang, 1951 accepted as Viannaia Travassos, 1914
- Genus Squamostrongylus Travassos, 1937
- Genus Travassostrongylus Orloff, 1933
- Genus Vianella accepted as Viannella Travassos, 1918
- Genus Viannaia Travassos, 1914
- Genus Viannella Travassos, 1920 accepted as Viannella Travassos, 1918
- Genus Viannella Travassos, 1918
- Genus Vlannia Travassos, 1915 accepted as Viannaia Travassos, 1914
- 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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