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
- 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
- Genus Alfortia Railliet, 1923 accepted as Strongylus Müller, 1780
- Genus Alocostoma Mawson, 1979
- Genus Amira Lane, 1914 accepted as Khalilia Neveu-Lemaire, 1924
- Genus Amiroides Strand, 1929 accepted as Khalilia Neveu-Lemaire, 1924
- Genus Amitroides Strand, 1929 accepted as Khalilia Neveu-Lemaire, 1924
- Genus Asifa Lane, 1914 accepted as Choniangium Railliet, Henry & Bauche, 1914
- Genus Bidentostomum Tshoijo, 1957
- Genus Borania Ricci, 1939
- Genus Buissonia Neveu-Lemaire, 1924 accepted as Murshidia Lane, 1914
- Genus Caballonema Abuladze, 1937
- Genus Chabaudia Campana-Rouget, 1959 accepted as Murshidia Lane, 1914
- Genus Chabertiella Tadros, 1964
- Genus Chapiniella Yamaguti, 1961
- Genus Choniagnium accepted as Choniangium Railliet, Henry & Bauche, 1914
- Genus Choniangium Railliet, Henry & Bauche, 1914
- Genus Cilicodontophorus accepted as Cylicodontophorus Ihle, 1922
- Genus Codiostomum Horst, Railliet & Henry, 1911
- Genus Coronocyclus Hartwich, 1986
- Genus Craterostomum Boulenger, 1920
- Genus Crycophorus Chaves, 1930
- Genus Cyathostomum Molin, 1861
- Genus Cycostomum accepted as Cyathostomum Molin, 1861
- Genus Cylichnostomum Looss, 1901 accepted as Cyathostomum Molin, 1861
- Genus Cylichostomum accepted as Cyathostomum Molin, 1861
- Genus Cylicobrachitus accepted as Cylicocyclus Ihle, 1922
- Genus Cylicobrachytus Cram, 1924 accepted as Cylicocyclus Ihle, 1922
- Genus Cylicocercus Ihle, 1922 accepted as Cyathostomum Molin, 1861
- Genus Cylicocyclus Ihle, 1922
- Genus Cylicodontophorus Ihle, 1922
- Genus Cylicostephanus Ihle, 1922
- Genus Cylicosternus accepted as Cylicostephanus Ihle, 1922
- Genus Cylicostoma Looss, 1911 accepted as Cyathostomum Molin, 1861
- Genus Cylicostomias Cram, 1925 accepted as Cyathostomum Molin, 1861
- Genus Cylicostomum Railliet, 1901 accepted as Cyathostomum Molin, 1861
- Genus Cylicostomus Leneveu, 1915 accepted as Cyathostomum Molin, 1861
- Genus Cylicotetrapedon Ihle, 1925 accepted as Cylicostephanus Ihle, 1922
- Genus Cylicotoichus Cram, 1924 accepted as Cyathostomum Molin, 1861
- Genus Cylindropharynx Leiper, 1911
- Genus Decrusia Lane, 1914
- Genus Delafondia Railliet, 1923 accepted as Strongylus Müller, 1780
- Genus Dicerocola Round, 1962
- Genus Echinopharynx Thapar, 1925 accepted as Sauricola Chapin, 1924
- Genus Equinurbia Lane, 1914
- Genus Erschowinema Tshoijo, 1957 accepted as Cylicostephanus Ihle, 1922
- Genus Ershovinema Tshoijo, 1957 accepted as Cylicostephanus Ihle, 1922
- Genus Eucyathostomum Molin, 1861
- Genus Evansia Railliet & Henry in Railliet, Henry & Joyeux, 1913 accepted as Quilonia Lane, 1914
- Genus Gyalocephalus Looss, 1900
- Genus Henryella Neveu-Lemaire, 1924 accepted as Murshidia Lane, 1914
- Genus Hexodontostomum Ihle, 1920 accepted as Poteriostomum Quiel, 1919
- Genus Hsiungia K'ung & Yang, 1964
- Genus Hudsonia Leroux, 1940
- Genus Hypodontus Mönnig, 1929
- Genus Javellia Ricci, 1939
- Genus Khalilia Neveu-Lemaire, 1924
- Genus Kiluluma Skrjabin, 1916
- Genus Macropicola Mawson, 1978
- Genus Macropostrongyloides Yamaguti, 1961
- Genus Maplestonema Johnston & Mawson, 1939
- Genus Memphisia Khalil, 1922 accepted as Murshidia Lane, 1914
- Genus Murshidia Lane, 1914
- Genus Nematevansia Ihle, 1919 accepted as Quilonia Lane, 1914
- Genus Neomurshidia Chabaud, 1957
- Genus Oesophagodontus Railliet & Henry, 1902
- Genus Oesophagostoma Giles, 1892 accepted as Oesophagostomum Molin, 1861
- Genus Oesophagostomoides Schwartz, 1928
- Genus Oesophagostomum Molin, 1861
- Genus Öesophagostomum Molin, 1861 accepted as Oesophagostomum Molin, 1861
- Genus Oesophagostonium Olt, 1898 accepted as Oesophagostomum Molin, 1861
- Genus Paradoxostrongylus Özdikmen, 2010
- Genus Paramacropostrongylus Johnson & Mawson, 1940
- Genus Parapoteriostomum Hartwich, 1986
- Genus Paraquilonia Neveu-Lemaire, 1924 accepted as Quilonia Lane, 1914
- Genus Parastrongylus Yin, Jiang & Kung, 1986 accepted as Paradoxostrongylus Özdikmen, 2010
- Genus Petrovinema Ershov, 1943
- Genus Phascolostongylus
- Genus Phascolostrongylus Canavan, 1931
- Genus Poteriostomum Quiel, 1919
- Genus Pseudosclerostomum Quiel, 1919 accepted as Oesophagodontus Railliet & Henry, 1902
- Genus Pteridopharynx Lane, 1921 accepted as Murshidia Lane, 1914
- Genus Pterygopharynx Lane, 1921 accepted as Murshidia Lane, 1914
- Genus Quilonia Lane, 1914
- Species Quilonia africana Lane, 1921
- Species Quilonia apiensis Gedoelst, 1916
- Species Quilonia brevicauda Khalil, 1922
- Species Quilonia crenelata Vuylsteke, 1953
- Species Quilonia edentata Zhang & Xie, 1992
- Species Quilonia ethiopica Khalil, 1922
- Species Quilonia guptai Gupta & Jaiswal, 1985
- Species Quilonia khalili Neveu-Lemaire, 1928
- Species Quilonia loxodontae Neveu-Lemaire, 1928
- Species Quilonia magma Neveu-Lemaire, 1928
- Species Quilonia parva Neveu-Lemaire, 1925
- Species Quilonia quilona Lane, 1914
- Species Quilonia rhinocerotis Neveu-Lemaire, 1924
- Species Quilonia simhai Gupta & Trivedi, 1985
- Species Quilonia spiculodentata Chabaud & Rousselot, 1956
- Species Quilonia travancra Lane, 1914
- Species Quilonia uganda Khalil, 1922
- Genus Rhinocerotonema Jiang, Yin & Kung, 1986
- Genus Sauricola Chapin, 1924
- Genus Schlerostoma Costa, 1864 accepted as Strongylus Müller, 1780
- Genus Schlerostomum Theobald, 1897 accepted as Strongylus Müller, 1780
- Genus Schultzitrichonema Ershov, 1943 accepted as Cylicocyclus Ihle, 1922
- Genus Schulzitrichonema accepted as Cylicocyclus Ihle, 1922
- Genus Sclerastoma Campbell & Lacroix, 1907 accepted as Strongylus Müller, 1780
- Genus Sclerostema Morgan, 1868 accepted as Strongylus Müller, 1780
- Genus Sclerostoma Rudolphi, 1809 accepted as Strongylus Müller, 1780
- Genus Sclerostomium Railliet, 1898 accepted as Strongylus Müller, 1780
- Genus Sclerostomum Dujardin, 1845 accepted as Strongylus Müller, 1780
- Genus Sclerostomum Diesing, 1851 accepted as Strongylus Müller, 1780
- Genus Sclerottoma Mudie in Blyth, 1840 accepted as Strongylus Müller, 1780
- Genus Sclorostomum Sonsino, 1878 accepted as Strongylus Müller, 1780
- Genus Sinostrongylus Hsuing & Chao, 1949 accepted as Caballonema Abuladze, 1937
- Genus Skladnikia Ricci, 1939
- Genus Sklerostomum Schneidemuehl, 1896 accepted as Strongylus Müller, 1780
- Genus Skrjabinodentus Tshoijo, 1957 accepted as Cylicostephanus Ihle, 1922
- Genus Srungylus Bosc, 1802 accepted as Strongylus Müller, 1780
- Genus Steongylus Giles, 1892 accepted as Strongylus Müller, 1780
- Genus Stongylus Gistl, 1857 accepted as Strongylus Müller, 1780
- Genus Strangulus Zenker, 1872 accepted as Strongylus Müller, 1780
- Genus Strogylus Meyer, 1896 accepted as Strongylus Müller, 1780
- Genus Strongglus Leblond, 1835 accepted as Strongylus Müller, 1780
- Genus Strongillus Renier, 1807 accepted as Strongylus Müller, 1780
- Genus Strongilus Rudolphi, 1801 accepted as Strongylus Müller, 1780
- Genus Strongolus Remlinger & Hodara, 1903 accepted as Strongylus Müller, 1780
- Genus Strongulus Watrin, 1838 accepted as Strongylus Müller, 1780
- Genus Strongylatus Railliet, 1900 accepted as Strongylus Müller, 1780
- Genus Strongylos Weinland, 1859 accepted as Strongylus Müller, 1780
- Genus Strongylus Müller, 1780
- Genus Strorgylus Galeb, 1878 accepted as Strongylus Müller, 1780
- Genus Strougilus Graham, 1906 accepted as Strongylus Müller, 1780
- Genus Strugglus Shaw, 1901 accepted as Strongylus Müller, 1780
- Genus Theileriana Monnig, 1924
- Genus Trichonema Cobbold, 1874 accepted as Cyathostomum Molin, 1861
- Genus Trichozema Cobbold, 1875 accepted as Cyathostomum Molin, 1861
- Genus Tridentoinfundibulum Tshoijo in Popova, 1958
- Genus Tridontoporus Railliet & Henry, 1902 accepted as Triodontophorus Looss, 1902
- Genus Triodontophorus Looss, 1902
- Genus Triodontoporus Railliet & Henry, 1902 accepted as Triodontophorus Looss, 1902
- Genus Triodontus Looss, 1900 accepted as Triodontophorus Looss, 1902
- Genus Tziminema Güiris-Andrade, Osorio-Sarabia & García-Prieto, 2018
- Genus Wuia K'ung, 1959
- Genus Zebrincola Ricci, 1939
- 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
- 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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