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
- 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
- Genus Acanthonychus Wang, 1982
- Genus Acostanychus Livshits, 1967 † accepted as Atrichoproctus Flechtmann, 1967 †
- Genus Afronobia Smith Meyer, 1974
- Genus Allobia Livschitz & Mitrofanov, 1969 accepted as Bryobia Koch in Panzer, 1835
- Genus Allonychus Pritchard & Baker, 1955
- Genus Amphitetranychus Oudemans, 1931
- Genus Anaplanobia Wainstein
- Genus Anaplonobia Wainstein, 1960
- Genus Anatetranychus Womersley, 1940
- Genus Anychus McGregor, 1920 accepted as Eurytetranychus Oudemans, 1931
- Genus Aplonobia Womersley, 1940
- Genus Aponychus Rimando, 1966
- Genus Apotetranychus Oudemans, 1931 accepted as Eotetranychus Oudemans, 1931
- Genus Armenychus Wainstein, 1960 accepted as Tetranychus Dufour, 1832
- Genus Atetranychus Tuttle, Baker & Abbatiello, 1974
- Genus Atrichoproctus Flechtmann, 1967 †
- Genus Augeriflechtmannia Koçak & Kemal, 2008
- Genus Bakerina Chaudhri, 1971 †
- Genus Bakerobryobia Hatzinikol & Emmanou, 1993 accepted as Bryobia Koch in Panzer, 1835
- Genus Beerella Wainstein, 1961
- Genus Brachynychus Mitrofanov & Strunkova, 1971 †
- Genus Brevinychus Smith Meyer, 1974
- Genus Bryiobia Packard, 1888 accepted as Bryobia Koch in Panzer, 1835
- Genus Bryobia Koch in Panzer, 1835
- Genus Bryobiella Tuttle & Baker, 1968 †
- Genus Bryobiopsis Mitrofanov, 1973 accepted as Pseudobryobia McGregor, 1950
- Genus Bryocopsis Smith Meyer, 1974
- Genus Chinotetranychus Ma & Yuan, 1982
- Genus Crotonella Tuttle, Baker & Abbatiello, 1974
- Genus Dasyobia Strunkova, 1971
- Genus Diplonychus Auger & Flechtmann, 2003
- Genus Dolichonobia Smith Meyer, 1974
- Genus Drepanonychus Davis, 1969 accepted as Anatetranychus Womersley, 1940
- Genus Dromicimyobia Fain, 1973 accepted as Archemyobia Jameson, 1955
- Genus Duplanychus Smith Meyer, 1974
- Genus Edella Smith Meyer, 1974
- Genus Eleutheronychus Mitrofanov, 1977 accepted as Polynychus Wainstein, 1960
- Genus Eonychus Gutierrez, 1969
- Genus Eotetranychus Oudemans, 1931
- Genus Epitetranychus Zacher, 1916 accepted as Tetranychus Dufour, 1832
- Genus Eremobryobia Strunkova & Mitrofanov, 1982
- Genus Eurytetranychoides Rick, 1950 accepted as Eurytetranychus Oudemans, 1931
- Genus Eurytetranychus Oudemans, 1931
- Genus Eutetranychus Banks, 1917
- Genus Evertella Smith-Meyer, 1987
- Genus Georgiobia Wainstein, 1960 accepted as Aplonobia Womersley, 1940
- Genus Hellenychus Gutierrez, 1971
- Genus Hemibryobia Tuttle & Baker, 1969 †
- Genus Heteronychus Canestrini & Fanzago, 1876 accepted as Oligonychus Berlese, 1886
- Genus Homonychus Wainstein, 1960 accepted as Oligonychus Berlese, 1886
- Genus Hystrichonychus McGregor, 1950
- Genus Langella Wainstein, 1961
- Genus Lindguistiella Mitrofanov, 1976 † accepted as Lindquistiella Mitrofanov, 1976 †
- Genus Lindquistiella Mitrofanov, 1976 †
- Genus Lyobia Livschitz & Mitrofanov, 1969 accepted as Bryobia Koch in Panzer, 1835
- Genus Macgregorella Baker & Tuttle, 1972 † accepted as Beerella Wainstein, 1961
- Genus Magdalena Baker & Tuttle, 1994
- Genus Marainobia Smith Meyer, 1974 †
- Genus Mcgregorella Baker & Tuttle, 1972 † accepted as Beerella Wainstein, 1961
- Genus McGregorella Zoological Record accepted as Beerella Wainstein, 1961
- Genus Mesobryobia Wainstein, 1956
- Genus Mesotetranychus Reck, 1948 accepted as Petrobia Murray, 1877
- Genus Metatetranychoides Wainstein, 1956 accepted as Paratetranychus Zacher, 1913
- Genus Metatetranychus Oudemans, 1931
- Genus Meyernychus Mitrofanov, 1977 †
- Genus Mezranobia Athias-Henriot, 1961
- Genus Mixonychus Ryke & Meyer, 1960
- Genus Monoceronychus McGregor, 1945
- Genus Mononychellus Wainstein, 1971 accepted as Schizotetranychus Trägårdh, 1915
- Genus Mononychus Wainstein, 1960 accepted as Schizotetranychus Trägårdh, 1915
- Genus Myxonychus Ryke & Meyer, 1960
- Genus Nearchemyobia Fain & Lukoschus, 1976 accepted as Archemyobia Jameson, 1955
- Genus Neobryobia Rekk, 1941 accepted as Petrobia Murray, 1877
- Genus Neonidulus Beard & Walter, 2010
- Genus Neonychus Mitrofanov, 1977
- Genus Neopetrobia Wainstein, 1956
- Genus Neoschizonobiella Tseng, 1990
- Genus Neotetranychus Trägårdh, 1915
- Genus Neotetranycopsis Bagdall, 1951 accepted as Hystrichonychus McGregor, 1950
- Genus Neotrichobia Tuttle & Baker, 1968
- Genus Noeschizonobiella Tseng, 1990 accepted as Neoschizonobiella Tseng, 1990
- Genus Notonychus Davis, 1969
- Genus Nuciforella Vacante, 1984 accepted as Bryobia Koch in Panzer, 1835
- Genus Oligonychus Berlese, 1886
- Genus Palmanychus Baker & Tuttle, 1972
- Genus Panonychus Yokoyama, 1929
- Genus Parabryobia Reck, 1952
- Genus Parabryobia Tuttle & Baker, 1968 † accepted as Hemibryobia Tuttle & Baker, 1969 †
- Genus Parapetrobia Meyer & Ryke, 1959
- Genus Paraplanobia Wainstein
- Genus Paraplonobia Wainstein, 1960
- Genus Paraponychus Gonzalez & Flechtmann, 1977
- Genus Paratetranychus Zacher, 1913
- Genus Peltanobia Smith Meyer, 1974
- Genus Pentanychus Wainstein, 1960 accepted as Tetranychus Dufour, 1832
- Genus Periplanobia Livschitz & Mitrofanov, 1969 accepted as Bryobia Koch in Panzer, 1835
- Genus Peritetranychus Ugarov & Nikolsky, 1937 accepted as Schizotetranychus Trägårdh, 1915
- Genus Petrobia Murray, 1877
- Genus Platytetranychus Oudemans, 1931 accepted as Eotetranychus Oudemans, 1931
- Genus Polynychus Wainstein, 1960
- Genus Porcupinychus Anwarullah, 1966
- Genus Pritchardina Rimando, 1962
- Genus Pritchardinychus Wainstein, 1960 accepted as Oligonychus Berlese, 1886
- Genus Pseudobryobia McGregor, 1950
- Genus Pseudonychus Wainstein, 1960 accepted as Tetranychus Dufour, 1832
- Genus Reckia Wainstein, 1960
- Genus Reckiella Tuttle & Baker, 1968 † accepted as Oligonychus Berlese, 1886
- Genus Rhodaxes Kirchner, 1863 accepted as Oligonychus Berlese, 1886
- Genus Rigiotetranychus Tseng, 1990
- Genus Sannio Scheuten, 1857
- Genus Sasanychus Ehara, 1978 accepted as Oligonychus Berlese, 1886
- Genus Schizonobia Womersley, 1940
- Genus Schizonobiella Beer & Lang, 1957
- Genus Schizotetranychus Trägårdh, 1915
- Genus Schmiedleinia Oudemans, 1928
- Genus Septanychus McGregor, 1920
- Genus Septobia Zaher, Gomaa & El-Enany, 1982
- Genus Simplinychus McGregor, 1950 accepted as Eurytetranychus Oudemans, 1931
- Genus Sinobryobia Ma, Gao & Chen, 1990
- Genus Sinotetranychus Ma & Yuan, 1980 accepted as Stylophoronychus Prasad, 1975
- Genus Sonotetranychus Tuttle, Baker & Abbatiello, 1976 †
- Genus Stigmaeopsis Banks, 1917
- Genus Strunkobia Livshitz & Mitrofanov, 1972
- Genus Stylophoronychus Prasad, 1975
- Genus Swarnanychus Mallik & Kumar, 1998
- Genus Synonychus Miller, 1966
- Genus Syonychus Miller
- Genus Tacebia Yokoyama, 1929 accepted as Oligonychus Berlese, 1886
- Genus Tauriobia Livshit & Mitrofanov, 1967
- Genus Tenuicrus Womersley, 1940 accepted as Petrobia Murray, 1877
- Genus Tenuipalpoides Rekk & Bagdasaryan, 1948
- Genus Tenuipalponychus ChannaBasavanna & Lakkundi, 1977
- Genus Tetranichus Dugès, 1834 accepted as Tetranychus Dufour, 1832
- Genus Tetranobia Banks, 1917
- Genus Tetranychina Banks, 1917 accepted as Petrobia Murray, 1877
- Genus Tetranychopsis Canestrini, 1891
- Genus Tetranychus Dufour, 1832
- Genus Tetranycopsis Canestrini, 1889
- Genus Tetranycus Walckenaer in Walckenaer & Gervais, 1847 accepted as Tetranychus Dufour, 1832
- Genus Tetronychus Agassiz, 1846 accepted as Tetranychus Dufour, 1832
- Genus Toronobia Smith-Meyer, 1987
- Genus Tribolonychus Zhang & Martin, 2001
- Genus Trichonychus Gutierrez, 1968
- Genus Tylonichus accepted as Mixonychus Ryke & Meyer, 1960
- Genus Tylonychus Miller, 1966 accepted as Mixonychus Ryke & Meyer, 1960
- Genus Wainsteiniella Tuttle & Baker, 1968 accepted as Oligonychus Berlese, 1886
- Genus Xinella Ma & Wang, 1991
- Genus Yezonychus Ehara, 1978
- Genus Yunonychus Ma & Gao, 1985
- Species Yunonychus daliensis Ma & Gao, 1985
- 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 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 †
- 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 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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