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
- Subphylum Chelicerata
- Class Arachnida
- Order Acari (awaiting allocation)
- Order Acariformes (awaiting allocation)
- Order Actinedida
- Suborder Octopoda accepted as Actinedida
- Suborder Tetrapoda accepted as Actinedida
- Family Acalyptonotidae Walter, 1911
- Family Acarophaenacidae accepted as Acarophenacidae Cross, 1965
- Family Acarophenacidae Cross, 1965
- Family Acercidae Thor, 1909 accepted as Pionidae Thor, 1900
- Family Acucapitidae Wiles, 1996
- Family Adamystidae Cunliffe, 1957
- Family Alichorhagiidae accepted as Alicorhagiidae Grandjean, 1939
- Family Alicorhagiidae Grandjean, 1939
- Family Allochaetophoridae Reck, 1959
- Family Alycidae Canestrini & Fanzago, 1877
- Family Amoenacaridae Smith & Cook, 1997
- Family Amphotrombiidae Zhang, 1998
- Family Anisitiellidae accepted as Anisitsiellidae Koenike, 1910
- Family Anisitsiellidae Koenike, 1910
- Family Anystidae Oudemans, 1902
- Family Apheviderulicidae Gerecke, Smith & Cook, 1999
- Family Arenohydracaridae Cook, 1974
- Family Arrenuridae Thor, 1900
- Family Astacocrotidae accepted as Astacocrotonidae Thor, 1927
- Family Astacocrotonidae Thor, 1927
- Family Athienemaniidae accepted as Athienemanniidae Viets, 1922
- Family Athienemanniidae Viets, 1922
- Family Athyreacaridae Lindquist, Kaliszewski & Rack, 1990
- Family Atracidae Thor, 1900 accepted as Unionicolidae Oudemans, 1909
- Family Atractideidae Thor, 1902 accepted as Torrenticolidae Piersig, 1902
- Family Aturidae Thor, 1900
- Genus Abelaturus Cook, 1985
- Species Abelaturus cornophorus Cook, 1983
- Species Abelaturus ogalus Cook, 1991
- Genus Acidoturus Smit, 2019
- Genus Adelaxonopsella Cook, 1974
- Genus Albaxona
- Genus Albia Thon, 1899
- Genus Albiella Lundblad, 1971 accepted as Albia Thon, 1899
- Genus Ameribrachypoda Smith, 1991 accepted as Phreatobrachypoda Cook, 1963
- Genus Amperaturus Cook, 1999
- Genus Anchistalbia Cook, 1974 accepted as Albia Thon, 1899
- Genus Asperaturus Smit & Pešić, 2020
- Genus Aturellus Piersig, 1901 accepted as Kongsbergia Thor, 1899
- Genus Aturides Lundblad, 1937
- Genus Aturus Kramer, 1875
- Genus Austramideopsoides Cook, 1983 accepted as Guineaxonopsis Imamura, 1983
- Genus Austraturus Viets, 1978
- Genus Axona Kramer, 1875 accepted as Brachypoda Forel, 1879
- Genus Axonopsalbia Viets, 1914
- Genus Axonopsella Lundblad, 1930
- Genus Axonopsis Piersig, 1893
- Genus Azugaturus Cook, 1986
- Genus Barbaxona Viets, 1924
- Genus Barbaxonella Lundblad, 1954
- Genus Barbaxonopsalbia Wiles, 1991
- Genus Barwontius Viets, 1978
- Genus Bharatalbia Cook, 1967
- Genus Bharatalbiella Cook, 1967 accepted as Bharatalbia Cook, 1967
- Genus Bleptaturus Cook, 1991
- Genus Brachipoda Forel, 1879
- Genus Brachypoda Forel, 1879
- Genus Brachypodella Viets, 1926 accepted as Brachypoda Forel, 1879
- Genus Brachypodopsis Piersig, 1903 accepted as Axonopsis Piersig, 1893
- Genus Brevaturus Schwoerbel, 1986 accepted as Rhynchaturus Besch, 1964
- Genus Cabellaturus Cook, 1986
- Genus Canterburaturus Pešić, Smit & Datry, 2010
- Genus Chilaxonopsella Cook, 1988 accepted as Axonopsella Lundblad, 1930
- Genus Coaxonopsalbia Cook, 1966 accepted as Pseudaxonopsalbia Viets, 1942
- Genus Coaxonopsella Cook, 1980 accepted as Axonopsella Lundblad, 1930
- Genus Colobaturus Cook, 1991
- Genus Cookaturus Smit, 2002
- Genus Crinaturus Thor, 1930 accepted as Aturus Kramer, 1875
- Genus Crocokongsbergia Orghidan & Gruia, 1980 accepted as Kongsbergia Thor, 1899
- Genus Cubaxonopsis Orghidan, Gruia & Iavorschi, 1981 accepted as Axonopsis Piersig, 1893
- Genus Davidsia Smit, 2007
- Genus Dentalbia Cook, 1974 accepted as Albia Thon, 1899
- Genus Eolethaxona Cook, 1963 accepted as Lethaxona Viets, 1932
- Genus Eomiraxonides Cook, 1988 accepted as Miraxonides Lundblad, 1938
- Genus Erebaxonopsis Motas & Tanasachi, 1947
- Genus Evidaturus Cook, 1985
- Genus Frontipodopsis Walter, 1919
- Genus Golaxonopsalbia Cook, 1966 † accepted as Neoaxonopsalbia Cook, 1966
- Genus Haloaxonopsis Pešić, Smit & Saboori, 2012
- Genus Hemibrachypoda Viets, 1937 accepted as Brachypoda Forel, 1879
- Genus Hestaturus Cook, 1991
- Genus Hexaxonopsalbia Viets, 1942 accepted as Hexaxonopsalbia Motas, 1928
- Genus Hexaxonopsalbia Motas, 1928
- Genus Hexaxonopsis Viets, 1926 accepted as Axonopsis Piersig, 1893
- Genus Hjartdalia Thor, 1901 accepted as Kongsbergia Thor, 1899
- Genus Humboldtaxonopsella Orghidan & Gruia, 1981 accepted as Axonopsella Lundblad, 1930
- Genus Iberaxonopsalbia Cook, 1974 accepted as Javalbia Viets, 1935
- Genus Japonalbia Imamura, 1977 accepted as Bharatalbia Cook, 1967
- Genus Japonaxonopsis Imamura, 1984 accepted as Phreatobrachypoda Cook, 1963
- Genus Javalbia Viets, 1935
- Genus Javalbicula Viets & Böttger, 1974 accepted as Javalbia Viets, 1935
- Genus Javalbiella Cook, 1966 †
- Genus Javalbiopsis Cook, 1967 accepted as Javalbia Viets, 1935
- Genus Kedacarus † accepted as Khedacarus Cook, 1967 †
- Genus Khedacarus Cook, 1967 †
- Genus Kongsbergia Thor, 1899
- Genus Kongsbergiella Cook, 1966 accepted as Kongsbergia Thor, 1899
- Genus Konsbergia Zoological Record accepted as Kongsbergia Thor, 1899
- Genus Kritaturus Cook, 1985
- Genus Lagoenaxonopsalbia Pešić & Smit in Pešić et al., 2018
- Genus Lamellaxona Lundblad, 1937 accepted as Neoaxona Lundblad, 1936
- Genus Lankaxonopsalbia Gledhill, 1982 accepted as Neoaxonopsalbia Cook, 1966
- Genus Lethaxona Viets, 1932
- Genus Lethaxonella Cook, 1963
- Genus Ljania Thor, 1898
- Genus Luciaxonopsella Rosso de Ferradas, 1995 accepted as Axonopsella Lundblad, 1930
- Genus Lyania Deeley, 1907 accepted as Ljania Thor, 1898
- Genus Masabania Walter & Bader, 1952
- Genus Megapes Smit & Pešić, 2014 accepted as Javalbia Viets, 1935
- Genus Melenaturus Cook, 1986
- Genus Minyaturus Smit & Pešić, 2020
- Genus Miraxona Lundblad, 1936
- Genus Miraxonella Lundblad, 1936 accepted as Miraxona Lundblad, 1936
- Genus Miraxonidella Cook, 1980 accepted as Miraxonides Lundblad, 1938
- Genus Miraxonides Lundblad, 1938
- Genus Mizudania Uchida, 1939 accepted as Lethaxona Viets, 1932
- Genus Motasaxona Cook, 1974 accepted as Pseudaxonopsalbia Viets, 1942
- Genus Naviaxonopsis Zoological Record accepted as Axonopsis Piersig, 1893
- Genus Navinaxonopsis Cook, 1967 accepted as Axonopsis Piersig, 1893
- Genus Neoalbia Lundblad, 1936
- Genus Neoalbiella Viets, 1954 accepted as Neoalbia Lundblad, 1936
- Genus Neoaturus Lundblad, 1941
- Genus Neoaxona Lundblad, 1936
- Genus Neoaxonopsalbia Cook, 1966
- Genus Neoaxonopsella Lundblad, 1937 accepted as Axonopsella Lundblad, 1930
- Genus Neoaxonopsis Lundblad, 1938
- Genus Neobarbaxona Cook, 1966
- Genus Neokongsbergia Lundblad, 1954 accepted as Kongsbergia Thor, 1899
- Genus Neotryssaturus Cook, 1974 †
- Genus Noesaturus Cook, 1988
- Genus Notaxona Besch, 1964
- Genus Notoaturus Besch, 1964
- Genus Ocybrachypoda Cook, 1974 accepted as Brachypoda Forel, 1879
- Genus Omanaxonopsis Smit & Pešić, 2010 †
- Genus Omegaturus Cook, 1985
- Genus Parabrachypoda Viets, 1929 accepted as Brachypoda Forel, 1879
- Genus Parakongsbergia Viets, 1949 accepted as Kongsbergia Thor, 1899
- Genus Parasitalbia Viets, 1935
- Genus Paratryssaturus Imamura, 1979
- Genus Paraxonopsella Lundblad, 1937 accepted as Axonopsella Lundblad, 1930
- Genus Paraxonopsis Motas & Tanasachi, 1947 accepted as Axonopsis Piersig, 1893
- Genus Pentalbia Lundblad, 1937 accepted as Submiraxona Lundblad, 1937
- Genus Phreatobrachypoda Cook, 1963
- Genus Pilosaturus Cook, 1985
- Genus Piotaturus Cook, 1985
- Genus Planaturus Cook, 1985
- Genus Plesiobrachypoda Viets, 1942 accepted as Axonopsis Piersig, 1893
- Genus Polyaxonopsella Lundblad, 1943 accepted as Axonopsella Lundblad, 1930
- Genus Prymnopsella Gerecke, 1991
- Genus Pseudaxonopsalbia Viets, 1942
- Genus Pseudaxonopsis Cook, 1963 accepted as Axonopsis Piersig, 1893
- Genus Pseudokongsbergia Walter, 1935 accepted as Kongsbergia Thor, 1899
- Genus Pseudotryssaturus Cook, 1985
- Genus Rhynchaturus Besch, 1964
- Genus Rhynchaturus Besch, 1963 accepted as Rhynchaturus Besch, 1964
- Genus Rostaxonopsella Orghidan & Gruia, 1987 accepted as Axonopsella Lundblad, 1930
- Genus Schwoerbelaturus Smit, 2019
- Genus Shebaturus Smit, 2017 accepted as Amperaturus Cook, 1999
- Genus Sinaxonopsis Yi & Jin, 2012
- Genus Spinalbia Cook, 1974 accepted as Albia Thon, 1899
- Genus Spinaturus Cook, 1986
- Genus Stokaxonopsis Cook, 1967
- Genus Stormaxonella Viets, 1962
- Genus Stygalbeilla Zoological Record accepted as Stygalbiella Cook, 1974
- Genus Stygalbiella Cook, 1974
- Genus Subalbia Viets, 1914
- Genus Subaturus Viets, 1917
- Genus Subaxonopsalbia Cook, 1966 †
- Genus Submiraxona Lundblad, 1937
- Genus Sumatralbia Viets, 1931
- Genus Taintaturus Cook, 1985
- Genus Tasmanaxona Cook, 1986
- Genus Thryptaturus Harvey, 1998
- Genus Tryssaturopsis Cook, 1974 †
- Genus Tryssaturus Hopkins, 1967
- Genus Twarntaturus Cook, 1986
- Genus Uenaxonopsis Imamura, 1961
- Genus Uralbia Hopkins, 1967 †
- Genus Ussuriaxona Tuzovskij, 1986
- Genus Vagabundia Valdecasas, 2008
- Genus Valsaturus Cook, 1999
- Genus Vicinaxonopsis Cook, 1974 accepted as Axonopsis Piersig, 1893
- Genus Vietsaxona Motals & Tanasachi, 1948 accepted as Albaxona
- Genus Villaxonopsalbia Cook, 1999
- Genus Wheenyella Cook, 1986
- Genus Zelandalbia Imamura, 1978 †
- Genus Zelandomomonia Smit, 2019 accepted as Momonia Halbert, 1906
- Genus Zelandopsis Imamura, 1977 †
- Genus Zidenaturus Habeeb, 1975 accepted as Aturus Kramer, 1875
- Family Audyanidae Southcott, 1987
- Family Axonopsidae Viets, 1929
- Family Barbutiidae Robaux, 1975
- Family Bdellidae Dugès, 1834
- Family Bembidiacaridae Khuastov, 2000
- Family Bimichaelidae accepted as Bimichaeliidae Womersley, 1944
- Family Bimichaeliidae Womersley, 1944
- Family Bogatiidae Motas & Tanasachi, 1948
- Family Bradypodidae Thor, 1900 accepted as Aturidae Thor, 1900
- Family Caeculidae Berlese, 1883
- Family Caligonellidae Grandjean, 1944
- Family Calyptostomatidae Oudemans, 1923
- Family Calyptostomidae Oudemans, 1923 accepted as Calyptostomatidae Oudemans, 1923
- Family Camerobiidae Southcott, 1957
- Family Caraboacaridae Mahunka, 1970
- Family Chappuisididae Motas & Tanasachi, 1946
- Family Chathrosperchonidae Lundblad, 1936 accepted as Rhynchohydracaridae Lundblad, 1936
- Family Chelomideopsidae Lundblad, 1962 accepted as Athienemanniidae Viets, 1922
- Family Cheyletidae Leach, 1815
- Family Chyzeriidae Womersley, 1954
- Family Cloacaridae Camin, Moss, Oliver & Singer, 1967
- Family Cocceupodidae Jesionowska, 2010
- Family Crotalomorphidae Lindquist & Krantz, 2002
- Family Cryptognathidae Oudemans, 1902
- Family Cryptognathiidae accepted as Cryptognathidae Oudemans, 1902
- Family Ctenothyadidae Lundblad, 1936
- Family Ctenothyasidae Lundblad, 1936 accepted as Ctenothyadidae Lundblad, 1936
- Family Cunaxidae Thor, 1902
- Family Curvipedidae Thor, 1900 accepted as Pionidae Thor, 1900
- Family Dasythyreidae Walter & Gerson, 1998
- Family Demodecidae Nicolet, 1855
- Family Demodicidae accepted as Demodecidae Nicolet, 1855
- Family Diplodontidae Lundblad, 1927 accepted as Hydrodromidae Viets, 1936
- Family Diptilomiopidae Keifer, 1944
- Family Dolichocybidae Mahunka, 1970
- Family Epallagopodidae Viets, 1953 accepted as Limnesiidae Thor, 1900
- Family Ereynetidae Oudemans, 1931
- Family Eriophyidae Nalepa, 1898
- Family Eriorhynchidae Qin & Halliday, 1997
- Family Erythracaridae Oudemans, 1936 accepted as Anystidae Oudemans, 1902
- Family Erythraeidae Robineau-Desvoidy, 1828
- Family Erythreidae Robineau-Desvoidy, 1828 accepted as Erythraeidae Robineau-Desvoidy, 1828
- Family Eupalopsellidae Willmann, 1952
- Family Eupatrellidae Viets, 1935
- Family Eupodidae C.L. Koch
- Family Eutrombidiidae Thor, 1935
- Family Eylaidae Leach, 1815
- Family Feltriidae Viets, 1926
- Family Ferradasiidae Cook, 1980
- Family Foreliidae Thor, 1923 accepted as Pionidae Thor, 1900
- Family Frontipodopsidae Viets, 1931
- Family Grandjeanicidae Kethley, 1977
- Family Gretacaridae Viets, 1978
- Family Halacaridae Murray, 1877
- Family Halcaridae accepted as Halacaridae Murray, 1877
- Family Harpagopalpidae Viets, 1924
- Family Harpirhynchidae Dubinin, 1957
- Family Harpyrhynchidae Dubinin, 1957 accepted as Harpirhynchidae Dubinin, 1957
- Family Heterocheylidae Trägårdh, 1950
- Family Homocaligidae Wood, 1969
- Family Hungarohydracaridae Motas & Tanasachi, 1959
- Family Hungarohydracharidae accepted as Hungarohydracaridae Motas & Tanasachi, 1959
- Family Hybalicidae Theron, 1974 accepted as Lordalychidae Grandjean, 1939
- Family Hydrachnidae Leach, 1815
- Family Hydrochoreutidae Viets, 1942 accepted as Pionidae Thor, 1900
- Family Hydrodromidae Viets, 1936
- Family Hydrovolziidae Thor, 1905
- Family Hydryphantidae Piersig, 1896
- Family Hygrobatidae C.L. Koch, 1842
- Family Iolinidae Pritchard, 1956
- Family Ioliniidae accepted as Iolinidae Pritchard, 1956
- Family Johnstonianidae Thor, 1935
- Family Kantacaridae Imamura, 1959
- Family Krendowskiidae Viets, 1926
- Family Labidostomatidae accepted as Labidostommatidae Oudemans, 1906
- Family Labidostommatidae Oudemans, 1906
- Family Labidostommidae Oudemans, 1906 accepted as Labidostommatidae Oudemans, 1906
- Family Laversiidae Cook, 1955
- Family Lebertiidae Thor, 1900
- Family Leeuwenhockiidae accepted as Leeuwenhoekiidae Womersley, 1944
- Family Leeuwenhoekiidae Womersley, 1944
- Family Lethaxonidae Cook, Smith & Harvey, 2000
- Family Limnesiidae Thor, 1900
- Family Limnocharidae Grube, 1859
- Family Limnohalacaridae
- Family Linotetranidae Baker & Pritchard, 1953
- Family Ljaniidae Thor, 1929 accepted as Aturidae Thor, 1900
- Family Lordalychidae Grandjean, 1939
- Family Lymnesiidae accepted as Limnesiidae Thor, 1900
- Family Mamersopsidae Viets, 1914 accepted as Anisitsiellidae Koenike, 1910
- Family Mecognathidae Gerson & Walter, 1998
- Family Microdispidae Cross, 1965
- Family Microdispodidae accepted as Microdispidae Cross, 1965
- Family Microereunetidae Bottazzi, 1950 accepted as Ereynetidae Oudemans, 1931
- Family Micropsammidae Y. Coineau & P. Theron, 1983
- Family Microtrombidiidae Thor, 1935
- Family Mideidae Thor, 1911
- Family Mideopsidae Koenike, 1910
- Family Momoniidae Viets, 1926
- Family Myobiidae Mégnin, 1877
- Family Nalepellidae Newkirk & Kiefer, 1975 accepted as Phytoptidae Murray, 1877
- Family Nanorchestidae Grandjean, 1937
- Family Nematalychidae accepted as Nematalycidae Strenzke, 1954
- Family Nematalycidae Strenzke, 1954
- Family Neoacaridae Motas & Tanasachi, 1947
- Family Neopygmephoridae Cross, 1965
- Family Neothrombidiidae accepted as Neothrombiidae Feider, 1955
- Family Neothrombiidae Feider, 1955
- Family Neotorrenticolidae Lundblad, 1936 accepted as Limnesiidae Thor, 1900
- Family Neotrombidiidae Feider, 1959
- Family Neumaniidae Thor, 1923 accepted as Unionicolidae Oudemans, 1909
- Family Nicoletiellidae Canestrini, 1891 accepted as Labidostommatidae Oudemans, 1906
- Family Nilotoniidae Viets, 1929
- Family Nipponacaridae Imamura, 1959
- Family Oehserchestidae Kethley, 1977
- Family Omartacaridae Cook, 1963
- Family Ophioptidae Southcott, 1956
- Family Oxidae Viets, 1926
- Family Pachygnathidae Kramer, 1877 accepted as Alycidae Canestrini & Fanzago, 1877
- Family Paratydeidae Baker, 1949
- Family Pediculochelidae Lavoipierre, 1946
- Family Pentapalpidae Olivier & Theron, 2000
- Family Penthaleidae Oudemans, 1931
- Family Penthalodidae Thor, 1933
- Family Pezidae M.S. Harvey, 1990
- Family Phytoptidae Murray, 1877
- Family Piersigiidae Oudemans, 1902
- Family Pionidae Thor, 1900
- Family Podapolipidae Ewing, 1922
- Family Podothrombiidae Thor, 1935
- Family Polyxohalacaridae Motas, 1972 accepted as Hydrovolziidae Thor, 1905
- Family Pomerantziidae Baker, 1949
- Family Pomerantzioidea incertae sedis
- Family Pontarachnidae Koenike, 1910
- Family Proteonematalycidae Kethley, 1989
- Family Proterorhagiidae Lindquist & Palacios-Vargas, 1991
- Family Pseudocheylidae Oudemans, 1909
- Family Psorergatidae Dubinin in Bregetova, Bulanova-Zakhvatkina, Volgin, Dubinin, Zakhvatkin, Zemskaya, Lange, Pavlovskii, Serdyukova & Shluger, 1955
- Family Pterygosomatidae Oudemans, 1910
- Family Pterygosomidae Oudemans, 1910 accepted as Pterygosomatidae Oudemans, 1910
- Family Pyemotidae Oudemans, 1937
- Family Pygmephoridae Cross, 1965
- Family Raphignathidae Kramer, 1877
- Family Resinacaridae Mahunka, 1976
- Family Rhagidiidae Oudemans, 1922
- Family Rhynchohydracaridae Lundblad, 1936
- Family Rutripalpidae Sokolow, 1934
- Family Saxidromidae Coineau, 1974 accepted as Adamystidae Cunliffe, 1957
- Family Scutacaridae Oudemans, 1916
- Family Siteroptidae Mahunka, 1970
- Family Smarididae Kramer, 1878
- Family Sperchonidae Thor, 1900 accepted as Sperchontidae Thor, 1900
- Family Sperchontidae Thor, 1900
- Family Sphaerolichidae Berlese, 1913
- Family Stigmaeidae Oudemans, 1931
- Family Strandtmanniidae M. Zacharda, 1979
- Family Stygomomonidae Szalay, 1943 accepted as Momoniidae Viets, 1926
- Family Stygothrombiidae Thor, 1935
- Family Stygotoniidae Cook, 1992
- Family Syringophilidae Lavoipierre, 1953
- Family Tanaupodastridae Feider, 1959 accepted as Tanaupodidae Thor, 1935
- Family Tanaupodidae Thor, 1935
- Family Tarsocheylidae Atyeo & Baker, 1964
- Family Tarsonemidae Kramer, 1877
- Family Teneriffiidae Thor, 1911
- Family Tenuipalpidae Berlese, 1913
- Family Teratothyadidae Viets, 1929
- Family Terpnacaridae Grandjean, 1939
- Family Tetranychidae Donnadieu, 1875
- Family Tetranychoidea incertae sedis
- Family Teutonidae Koenike, 1910 accepted as Teutoniidae Koenike, 1910
- Family Teutoniidae Koenike, 1910
- Family Thermacaridae Sokolow, 1927
- Family Thrombellidae Zoological Record, 1958 accepted as Trombellidae Leach, 1815
- Family Thrombidiidae accepted as Leeuwenhoekiidae Womersley, 1944
- Family Torrenticolidae Piersig, 1902
- Family Triasacaridae Lindquist & Sidorchuk in Sidorchuk et al., 2015 †
- Family Trichthoniidae Lee, 1982
- Family Trombellidae Leach, 1815
- Family Trombiculidae Ewing, 1929
- Family Trombidiidae Leach, 1815
- Family Trombidioidea incertae sedis
- Family Tuckerellidae Baker & Pritchard, 1953
- Family Tydeidae Kramer, 1877
- Family Uchidastygacaridae Imamura, 1956
- Family Ungarohydracaridae accepted as Hungarohydracaridae Motas & Tanasachi, 1959
- Family Unionicolidae Oudemans, 1909
- Family Vatacaridae Southcott, 1957 accepted as Trombiculidae Ewing, 1929
- Family Walchiidae Ewing, 1946
- Family Wettinidae Cook, 1956
- Family Xenocaligonellidae Gonzalez, 1978 accepted as Xenocaligonellididae Gonzalez, 1978
- Family Xenocaligonellididae Gonzalez, 1978
- Family Yurebillidae Southcott, 1996
- Family Zelandothyadidae Cook, 1983
- Order Amblypygi
- Order Arachnida (awaiting allocation)
- Order Arachnida incertae sedis
- Order Araneae
- Order Architarbida †
- Order Astigmata
- Order Haptopodida †
- Order Holothyrida
- Order Ixodida
- Order Mesostigmata
- Order Opilioacarida
- Order Opiliocariformes
- Order Opiliones
- Order Opilionida accepted as Opiliones
- Order Oribatida
- Order Palaeoscorpiones †
- Order Palpigradi
- Order Parasitiformes (awaiting allocation)
- Order Phalangiotarbida
- Order Protoscorpiones †
- Order Pseudoscorpionida
- Order Ricinulei
- Order Ricinuleida accepted as Ricinulei
- Order Schizomida
- Order Scorpiones
- Order Scorpionida accepted as Scorpiones
- Order Solifugae
- Order Solpugida accepted as Solifugae
- Order Trigonotarbida †
- Order Trombidiformes
- Order Uropygi
- Class Merostomata accepted as Xiphosura
- Class Pycnogonida
- Class Xiphosura
- Order Chasmataspidida †
- Order Cyrtoctenida † accepted as Eurypterida †
- Order Eurypterida †
- Order Mollisoniida †
- Family Bunodidae Packard, 1886 †
- Family Offacolidae Sutton, Briggs, Siveter, Siveter & Orr, 2002 †
- Family Pseudoniscidae Packard, 1886 †
- Family Weinberginidae Richter & Richter, 1929 † accepted as Chelicerata
- Genus Anderella Moore, McKenzie & Lieberman, 2007 †
- Genus Borchgrevinkium Novojilov, 1958 †
- Genus Camanchia Moore, Briggs, Braddy & Shultz, 2011 †
- Genus Lagrandella Eldredge, 1974 † accepted as Legrandella Eldredge, 1974 †
- Genus Legrandella Eldredge, 1974 †
- Genus Sarotrocercus Whittington, 1981 †
- Genus Setapedites Lustri, Gueriau & Daley, 2024 †
- Genus Titanoprosoma Bicknell, Kimmig, Smith & Scherer, 2024 †
- Genus Venustulus Moore in Moore et al., 2005 †
- Genus Weinbergina Richter & Richter, 1929 †
- Subphylum Crustacea
- Subphylum Hexapoda
- Subphylum Myriapoda
- Subphylum Trilobitomorpha †
- Class Arachnomorpha (awaiting allocation)
- Class Arthropoda (awaiting allocation)
- Class Artiopoda †
- Class Crustaceomorpha incertae sedis †
- Class Dinocaridida †
- Class Labrophora incertae sedis
- Class Lamellipedia incertae sedis
- Class Megacheira †
- Class Thylacocephala †
- Class Xenocarida incertae sedis
- Order Canadaspidida † accepted as Hymenocarina †
- Order Cheloniellida †
- Order Emeraldellida † accepted as Arthropoda
- Order Fuxianhuiida †
- Order Habeliida †
- Order Hymenocarina †
- Order Isoxyida †
- Order Pectocaridida † accepted as Hymenocarina †
- Order Waptiida † accepted as Hymenocarina †
- Family Bomakellidae Fedonkin, 1987 †
- Family Burgessiidae Walcott, 1912 †
- Family Emeraldellidae Raymond, 1935 †
- Family Guangweicarididae Luo, Fu, Hu, Li, Hou, You, Pang & Liu, 2007 †
- Genus Aaveqaspis Peel & Stein, 2009 †
- Genus Acheronauta Pulsipher, Anderson, Wright, Kluessendorf, Mikulic & Schiffbauer, 2022 †
- Genus Arthroaspis Stein, Budd, Peel & Harper, 2013 †
- Genus Astutuscaris Jiao & Du, 2022 †
- Genus Bennettarthra Fayers, Trewin & Morrissey, 2010 †
- Genus Bushizheia O'Flynn & Liu in O'Flynn et al., 2020 †
- Genus Chuandianella Hou & Bergström, 1991 †
- Genus Dioxycaris Gürich, 1929 †
- Genus Dongshanocaris Hou, Bergström, Wang, Feng & Chen, 1999 †
- Genus Duraznovis Lara, Cariglino & Zavattieri in Lara et al., 2019 †
- Genus Duraznovs Lara, Cariglino & Zavattieri in Lara et al., 2019 † accepted as Duraznovis Lara, Cariglino & Zavattieri in Lara et al., 2019 †
- Genus Esmeraldacaris Waggoner, 2003 †
- Genus Fibulacaris Izquierdo-López & Caron, 2019 †
- Genus Kiisortoqia Stein, 2010 †
- Genus Kylinxia Zeng, Zhao, Niu, Zhu & Huang, 2020 †
- Genus Lihuacaris Jiao, Pates, Lerosey-Aubril, Ortega-Hernández, Yang, Lan & Zhang, 2021 †
- Genus Norikeya Tanaka, Siveter & Williams, 2013 †
- Genus Nothozoe Barrande, 1872 †
- Genus Nothozoe Barrande in Bigsby, 1868 † accepted as Nothozoe Barrande, 1872 †
- Genus Notozoe Zittel, 1885 † accepted as Nothozoe Barrande, 1872 †
- Genus Pakucaris Izquierdo-López & Caron, 2021 †
- Genus Pambdelurion Budd, 1998 †
- Genus Parvibellus Liu, Dunlop, Steiner & Shu, 2022 †
- Genus Pleuralata McCoy, Strother & Briggs, 2012 †
- Genus Pseudoangustidontus Van Roy & Tetlie, 2006 †
- Genus Pteroessa Hudson & Gosse, 1886
- Genus Sidneyia Walcott, 1911 †
- Genus Siriocaris Lagebro, Stein & Peel, 2009 †
- Genus Vermontcaris Pari, Briggs & Gaines, 2022 †
- Genus Youti Smith, Long, Dhungana, Dobson, Yang & Zhang, 2024 †
- 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
- 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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