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
- Order Amblypygi
- Order Arachnida (awaiting allocation)
- Order Arachnida incertae sedis
- Order Araneae
- Order Architarbida †
- Order Astigmata
- Order Haptopodida †
- Order Holothyrida
- Order Ixodida
- Order Mesostigmata
- Family Aenicteguidae Kethley, 1977 accepted as Aenictequidae
- Family Aenictequidae
- Family Ameroseiidae Evans in Hughs, 1961
- Family Antennochelidae Lindquist & Moraza, 2014
- Family Antennophoridae Berlese, 1892
- Family Antennoseiidae
- Family Arctacaridae Evans, 1955
- Family Ascidae Oudemans, 1905
- Family Asternoseiidae Valle, 1955
- Family Blattisociidae Garman, 1948
- Family Bulbogamasidae
- Family Castriidinychidae Hirschmann, 1979
- Family Celaenopsidae Berlese, 1892
- Family Cercomegistidae Trägårdh, 1937
- Family Cillibidae Trägårdh, 1944
- Family Circocyllibamidae Sellnick, 1926
- Family Coprozerconidae Moraza & Lindquist, 1999
- Family Costacaridae P.E. Hunter, 1993
- Family Cropodidae accepted as Uropodidae Kramer, 1881
- Family Cyrtolaelapidae
- Family Dasyponyssidae Fonseca, 1940
- Family Davacaridae Kethley, 1977
- Family Deraiophoridae Trägårdh, 1952 accepted as Eutrachytidae Trägardh, 1944
- Family Dermanyssidae Kolenati, 1859
- Family Diarthrophallidae Trägårdh, 1946
- Family Digamasellidae Evans, 1956
- Family Digmasellidae accepted as Digamasellidae Evans, 1956
- Family Dinychidae Berlese, 1916
- Family Diplogyniidae Trägårdh, 1941
- Family Discourellidae Baker & Wharton, 1952
- Family Discozerconidae Berlese, 1910
- Family Dithinozerconidae Ainscough, 1979
- Family Dwigubskyiidae Vitzthum, 1941
- Family Entonyssidae Ewing, 1922
- Family Epicriidae Berlese, 1885
- Family Euphysalozerconidae Kim, 2008
- Family Euryparasitidae d'Antony, 1987
- Family Eutrachytidae Trägardh, 1944
- Family Euzerconidae Trägårdh, 1938
- Family Eviphididae Berlese, 1913
- Family Fedrizziidae Trägårdh, 1937
- Family Gamasellidae
- Family Gamasidae accepted as Parasitidae Oudemans, 1901
- Family Gamasolaelaptidae Oudemans, 1939 accepted as Veigaiidae Oudemans, 1939
- Family Haemogamasidae Oudemans, 1939
- Family Halarachnidae Oudemans, 1906
- Family Halolaelapidae Karg, 1965
- Family Heatherellidae Walter, 1997
- Family Heterozerconidae Berlese, 1892
- Family Hirstionyssidae Evans & Till, 1966
- Family Hoplomegistidae Camin & Gorirossi, 1955
- Family Hutufeideriidae Hirschmann, 1979
- Family Hystrichonyssidae Keegan, Yunker & Baker, 1960
- Family Ichthyosomatogasteridae accepted as Ichthyostomatogasteridae Sellnick, 1953
- Family Ichthyostomatogasteridae Sellnick, 1953
- Family Iphiopsidae Kramer, 1886 accepted as Laelapidae Berlese, 1892
- Family Iphiopsididae accepted as Laelapidae Berlese, 1892
- Family Ixodorhynchidae Ewing, 1923
- Family Klinckowstroemiidae Trägårdh, 1950
- Family Laelapidae Berlese, 1892
- Genus Acantholaelaps Joharchi, Halliday, Tolstikov & Trach, 2019
- Genus Aetholaelaps Strandtmann & Camin, 1956
- Genus Alloparasitus Berlese, 1921 accepted as Hypoaspis Canestrini, 1884
- Genus Allophilaelaps Cunliffe, 1959 accepted as Dinogamasus Kramer, 1898
- Genus Alphalaelaps Radford, 1951
- Species Alphalaelaps aplodontiae (Jellison, 1945)
- Genus Andreacaroides Fain, 1991 accepted as Andreacarus Radford, 1953
- Genus Andreacarus Radford, 1953
- Genus Androlaelaps Berlese, 1903
- Genus Angosomaspis Costa, 1971
- Genus Atricholaelaps Ewing, 1929
- Genus Australolaelaps Womersley, 1956 accepted as Thadeua Domrow, 1977
- Genus Austrogamasellus Domrow, 1957 accepted as Pseudoparasitus Oudemans, 1902
- Genus Austrogamasus Womersley, 1943 accepted as Pseudoparasitus Oudemans, 1902
- Genus Austrolaelaps Womersley, 1956
- Genus Banksia Radford, 1942 accepted as Pililaelaps Radford, 1947
- Genus Berlesia Canestrini, 1884
- Genus Bewsiella Domrow, 1958
- Genus Bianyssus Wen, 1975 accepted as Ichoronyssus Kolenati, 1858
- Genus Bisternalis Hunter, 1963
- Genus Blaberolaelaps Costa, 1980
- Genus Bolivilaelaps Fonseca, 1940
- Genus Brucharachne Mello-Leitão, 1927 accepted as Sphaeroseius Berlese, 1904
- Genus Camerolaelaps Fonseca, 1960
- Genus Cavilaelaps Fonseca, 1937
- Genus Chalaza Domrow, 1990
- Genus Chamolaelaps Turk & Turk, 1952
- Genus Chapalaelaps Gwiazdowicz, Nemati & Riahi, 2020
- Genus Chapalania Hoffmann & Lopez-Campos, 1995
- Genus Chelanyssus Zumpt & Till, 1953
- Genus Chirolaelaps Heath, Bishop & Daniel, 1987
- Genus Chrysochlorolaelaps Evans & Till, 1966
- Genus Coleolaelaps Berlese, 1915
- Genus Conolaelaps Womersley, 1959
- Genus Cosmiphis Vitzthum, 1926
- Genus Cosmolaelaps Berlese, 1903
- Genus Cyclolaelaps Ewing, 1933
- Genus Cyclothorax Frauenfeld, 1868
- Genus Cypholaelaps Berlese, 1916
- Genus Cyrtolaelaps Berlese, 1887
- Genus Cystolaelaps Trägårdh, 1904 accepted as Cyrtolaelaps Berlese, 1887
- Genus Davisiella Zumpt & Patterson, 1951 accepted as Stratiolaelaps Berlese, 1917
- Genus Dianolaelaps Gu & Duan, 1990
- Genus Dicrocheles Krantz & Khot, 1962
- Genus Dinogamasus Kramer, 1898
- Genus Dipolaelaps Zemskaya & Piontkovskaya, 1960
- Genus Dolaea Oudemans, 1912 accepted as Dinogamasus Kramer, 1898
- Genus Domrownyssus Evans & Till, 1966
- Genus Donia Oudemans, 1939
- Genus Dynastaspis Costa, 1971
- Genus Dynatochela Keegan, 1950
- Genus Dyscinetonyssus Moss & Funk, 1965
- Genus Echinolaelaps Ewing, 1929
- Genus Echinonyssus Hirst, 1925
- Genus Ellsworthia Turk, 1945
- Genus Emaeus Berlese, 1904
- Genus Emeus Mégnin, 1880
- Genus Euandrolaelaps accepted as Hypoaspis Canestrini, 1884
- Genus Eubrachylaelaps Ewing, 1929
- Genus Euelaelaps
- Genus Eugynolaelaps Berlese, 1918
- Genus Euiphis Oudemans, 1905 accepted as Eviphis Berlese, 1904
- Genus Eulaelaps Berlese, 1903
- Genus Eumaeus Koch, 1843 accepted as Hyletastes Gistl, 1848
- Genus Eumellitiphis Turk, 1948
- Genus Euryaspis Bernhard, 1971 accepted as Hypoaspis Canestrini, 1884
- Genus Eviphis Berlese, 1904
- Genus Gammaridacarus Canaris, 1962
- Genus Garmania Nesbitt, 1951
- Genus Gecarcinolaelaps Casanueva, 1992
- Genus Geneiadolaelaps Ewing, 1929
- Genus Geolaelaps Berlese, 1924 accepted as Hypoaspis Canestrini, 1884
- Genus Gigantolaelaps Fonseca, 1939
- Genus Gnatholaelaps Till, 1972 accepted as Androlaelaps Berlese, 1903
- Genus Gopriphis Berlese, 1910
- Genus Greenia Oudemans, 1901 accepted as Dinogamasus Kramer, 1898
- Genus Greeniella Banks, 1904 accepted as Dinogamasus Kramer, 1898
- Genus Greeniella Berlese, 1910 accepted as Jacobsonia Berlese, 1910
- Genus Gromphadorholaelaps Till, 1969 † accepted as Androlaelaps Berlese, 1903
- Genus Gymnolaelaps Berlese, 1917 accepted as Pseudoparasitus Oudemans, 1902
- Genus Haemolaelaps Berlese, 1910 accepted as Androlaelaps Berlese, 1903
- Genus Halbertia Turk & Turk, 1952
- Genus Hemilaelaps Ewing, 1933 accepted as Ellsworthia Turk, 1945
- Genus Heterolaelaps Hirst, 1926 accepted as Mesolaelaps Hirst, 1926
- Genus Hoplolaelaps Berlese, 1910 accepted as Pseudolaelaps Berlese, 1917
- Genus Hoplolaelaps Berlese, 1903 accepted as Pseudoparasitus Oudemans, 1902
- Genus Hunteracarus Costa, 1975
- Genus Hunteria Delfinado-Baker, Baker & Flechtmann, 1984
- Genus Hyletastes Gistl, 1848
- Genus Hymenolaelaps Furman, 1972
- Genus Hyperlaelaps Zakhvatkin, 1948 accepted as Laelaps Koch, 1836
- Genus Hypoaceus Nemati, Gwiazdowicz & Riahi, 2021
- Genus Hypoaspis Canestrini, 1884
- Genus Hypoaspisella Bernhard, 1971 † accepted as Hypoaspis Canestrini, 1884
- Genus Hypohasta Karg, 1979 accepted as Hypoaspis Canestrini, 1884
- Genus Hyposternus Joharchi & Halliday, 2021
- Genus Ichoronyssus Kolenati, 1858
- Genus Iphidopsis Oudemans, 1904 accepted as Iphiopsis Berlese, 1882
- Genus Iphiolaelaps Womersley, 1956
- Genus Iphiopis Banks, 1904 accepted as Iphiopsis Berlese, 1882
- Genus Iphiopsis Berlese, 1882
- Genus Iphis Koch, 1835 accepted as Hyletastes Gistl, 1848
- Genus Ischnolaelaps Fonseca, 1936 accepted as Atricholaelaps Ewing, 1929
- Genus Jacobsonia Berlese, 1910
- Genus Japanoasternolaelaps Hirschmann & Hiramatsu, 1984
- Genus Jordensia Oudemans, 1938
- Genus Jördensia Oudemans, 1938 accepted as Jordensia Oudemans, 1938
- Genus Julolaelaps Berlese, 1917
- Genus Juxtalaelaps Dowling, Bochkov & O'Connor, 2007
- Genus Laclaps Canestrini, 1884 accepted as Laelaps Koch, 1836
- Genus Laelantennus Berlese, 1917
- Genus Laelaps Koch, 1836
- Genus Laelapsella Womersley, 1955
- Genus Laelapsoides Willmann, 1952
- Genus Laelaptoseius Womersley, 1960
- Genus Laelaspis Berlese, 1903 accepted as Hypoaspis Canestrini, 1884
- Genus Laelaspoides Eickwort, 1966 †
- Genus Laelaspulus Berlese, 1904
- Genus Leclaps Kolenati, 1858 accepted as Laelaps Koch, 1836
- Genus Leelaps Kolenati, 1856 accepted as Laelaps Koch, 1836
- Genus Lelaspis Berlese, 1903 accepted as Hypoaspis Canestrini, 1884
- Genus Ligialaelaps Radford, 1942
- Genus Liponysella Hirst, 1925
- Genus Ljunghia Oudemans, 1932
- Genus Loelaps Mégnin, 1880 accepted as Laelaps Koch, 1836
- Genus Longolaelaps Vitzthum, 1926
- Genus Lucanaspis Costa, 1971
- Genus Lukoschus Radovsky & Gettinger, 1999
- Genus Mabuyonyssus Till, 1957
- Genus Macrolaelaps Ewing, 1929
- Genus Manisilaelaps Lavoipierre, 1956
- Genus Mastigolaelaps Tenorio & Radovsky, 1973 accepted as Laelaps Koch, 1836
- Genus Meliponaspis Vitzthum, 1930
- Genus Melittiphis Berlese, 1918
- Genus Melittiphisoides Delfmado-Baker, Baker & Flechtmann, 1984
- Genus Melittipis accepted as Melittiphis Berlese, 1918
- Genus Mellitiphis
- Genus Mesolaelaps Hirst, 1926
- Genus Metaljunghia Fain, 1989 accepted as Ljunghia Oudemans, 1932
- Genus Metaspinolaelaps Till, 1958
- Genus Microtilaelaps Zakhvatkin, 1948 accepted as Laelaps Koch, 1836
- Genus Mumulaelaps Clark, 2012
- Genus Mungosicola Radford, 1942
- Genus Myolaelaps Zakhvatkin, 1948 accepted as Laelaps Koch, 1836
- Genus Myomyssus
- Genus Myonyssoides Hirst, 1925
- Genus Myonyssus Tiraboschi, 1904
- Genus Myrmeciphis Hull, 1923
- Genus Myrmolaelaps Trägårdh, 1906
- Genus Myrmoleichus Berlese, 1904 accepted as Myrmosleichus Berlese, 1903
- Genus Myrmonyssus Berlese, 1903 accepted as Myrmozercon Berlese, 1902
- Genus Myrmosleichus Berlese, 1903
- Genus Myrmozercon Berlese, 1902
- Genus Mysolaelaps Fonseca, 1936
- Genus Nakhoda Domrow & Nadchatram, 1975
- Genus Narceolaelaps Kethley, 1978
- Genus Neoberlesia Berlese, 1892
- Genus Neohypoaspis Delfinado-Baker, Baker & Roubik, 1983
- Genus Neolaelaps Hirst, 1926
- Genus Neoparalaelaps Fonseca, 1936
- Genus Neospinolaelaps Patterson, 1952
- Genus Nidilaelaps Shaw, 2012
- Genus Notolaelaps Womersley, 1957
- Genus Olalaelaps Berlese, 1904 accepted as Hypoaspis Canestrini, 1884
- Genus Oloiphis Berlese, 1917
- Genus Ololaelaps Berlese, 1905
- Genus Oloopticus Karg, 1978 accepted as Pseudoparasitus Oudemans, 1902
- Genus Ondatralaelaps Evans & Till, 1965
- Genus Ophidilaelaps Radford, 1947 accepted as Ellsworthia Turk, 1945
- Genus Ornitholaelaps Okereke, 1968
- Genus Oryctolaelaps Lange in Bregetova et al., 1955
- Genus Parabisternalis Ueckermann & Loots, 1995
- Genus Paragarmania Nesbitt, 1951 accepted as Garmania Nesbitt, 1951
- Genus Paragreenia Cockerell, 1907 accepted as Dinogamasus Kramer, 1898
- Genus Parajacobsonia Evans, 1955 accepted as Jacobsonia Berlese, 1910
- Genus Paralaelaps Fonseca, 1935 accepted as Neoparalaelaps Fonseca, 1936
- Genus Peramelaelaps Womersley, 1956
- Genus Phytojacobsonia Vitzthum, 1925
- Genus Pililaelaps Radford, 1947
- Genus Pleisiolaelaps Womersley, 1957
- Genus Plesiolaelaps Womersley, 1957 accepted as Ichoronyssus Kolenati, 1858
- Genus Pneumolaelaps Berlese, 1921
- Genus Podolaelaps Berlese, 1888
- Genus Praeparasitus Berlese, 1921
- Genus Pristolaelaps Womersley, 1956 accepted as Ololaelaps Berlese, 1905
- Genus Promacrolaelaps Costa, 1971 †
- Genus Protonyssus Turk, 1947 accepted as Tur Baker & Wharton, 1952
- Genus Pseudolaelaps Berlese, 1917
- Genus Pseudoparasitus Oudemans, 1902
- Genus Qinghailaelaps Gu & Yang, 1984
- Genus Rad Baker & Wharton, 1952 accepted as Pililaelaps Radford, 1947
- Genus Radfordilaelaps Zumpt, 1950
- Genus Rattilaelaps Lange in Bregetova et al., 1955
- Genus Rattilaelaps Zakhvatkin, 1948 accepted as Laelaps Koch, 1836
- Genus Raymentia Womersley, 1956
- Genus Reticulolaelaps Costa, 1968
- Genus Rhinolaelaps Fonseca, 1960
- Genus Rhodacantha Domrow, 1979
- Genus Rhyzolaelaps Bregetova & Grokhovskaya, 1961
- Genus Saelops Kirchner, 1864 accepted as Laelaps Koch, 1836
- Genus Schistolaelaps Fonseca, 1960 accepted as Laelaps Koch, 1836
- Genus Schizolaelaps Fonseca, 1959 accepted as Laelaps Koch, 1836
- Genus Scirus Hermann, 1804 accepted as Cunaxa von Heyden, 1826
- Genus Scissuralaelaps Womersley, 1945
- Genus Scolopendracarus Evans, 1955
- Genus Scorpionyssus Fain & Rack, 1988
- Genus Sinolaelaps Gu & Wang, 1979
- Genus Sphaeroseius Berlese, 1904
- Genus Spinolaelaps Radford, 1940 accepted as Ichoronyssus Kolenati, 1858
- Genus Stamfordia Trägårdh, 1906
- Genus Steptolaelaps Furman, 1955
- Genus Sternolaelaps Zumpt & Patterson, 1951
- Genus Stevelus Hunter, 1963
- Genus Stigmatolaelaps Krantz, 1998
- Genus Stratiolaelaps Berlese, 1917
- Genus Suracarus Flechtmann, 2005
- Genus Tengilaelaps Gu & Wang, 1996
- Genus Termitacarus Trägårdh, 1906 accepted as Urozercon Berlese & Leonardi, 1901
- Genus Tetragonyssus Ewing, 1924 accepted as Myonyssus Tiraboschi, 1904
- Genus Tetranychoides Banks, 1904 accepted as Tydeus Koch, 1837
- Genus Thadeua Domrow, 1977
- Genus Tricholaelaps Vitzthum, 1926
- Genus Trichosurolaelaps Womersley, 1956
- Genus Troiolaelaps
- Genus Tropilaelaps Delfinado & Baker, 1961
- Genus Tur Baker & Wharton, 1952
- Genus Turkiella Zumpt & Till, 1953
- Genus Tydaeus Berlese, 1908 accepted as Tydeus Koch, 1837
- Genus Tydeus Koch, 1837
- Genus Tylolaelaps Gu & Wang, 1979
- Genus Typhlomylaelaps Petrova & Taskaeva, 1964 accepted as Laelaps Koch, 1836
- Genus Ugandolaelaps Radford, 1942
- Genus Ulyxes Shaw, 2014
- Genus Uroiphis Berlese, 1905
- Genus Uronyssus Halliday, 2006 accepted as Urozercon Berlese & Leonardi, 1901
- Genus Urozercon Berlese & Leonardi, 1901
- Genus Xylocolaelaps Royce & Krantz, 2003
- Genus Zontia Turk, 1948
- Genus Zygolaelaps Tipton, 1957
- Family Laelaptidae accepted as Laelapidae Berlese, 1892
- Family Laelaptonyssidae Womersley, 1956
- Family Larvamimidae R.J. Elzinga, 1993
- Family Leptolaelapidae Karg, 1978
- Family Liroaspididae Trägårdh, 1946 accepted as Sejidae Berlese, 1885
- Family Machrochelidae accepted as Macrochelidae Vitzthum, 1930
- Family Macrochelidae Vitzthum, 1930
- Family Macrodinychidae Hirschmann, 1979
- Family Macronyssidae Oudemans, 1936
- Family Manitherionyssidae Radovsky & Yunker, 1971
- Family Megacelaenopsidae R.C. Funk, 1975
- Family Megalolaelapidae
- Family Megisthanidae Berlese, 1914
- Family Meinertulidae Trägårdh, 1950
- Family Melicharidae Hirschmann, 1962 accepted as Ascidae Oudemans, 1905
- Family Messoracaridae Kethley, 1977
- Family Metagynellidae Camin, 1953 accepted as Metagynuridae Balogh, 1943
- Family Metagynuridae Balogh, 1943
- Family Microgyniidae Trägårdh, 1942
- Family Microsejidae Trägårdh, 1942 accepted as Microgyniidae Trägårdh, 1942
- Family Nenteriidae Hirschmann, 1979
- Family Neoparasitidae Oudemans, 1939 accepted as Pachylaelapidae Berlese, 1913
- Family Neotenogyniidae Kethley, 1974
- Family Nothogynidae Walter & Krantz, 1999
- Family Ologamasidae Ryke, 1962
- Family Ologamasiidae accepted as Ologamasidae Ryke, 1962
- Family Omentolaelapidae Fain, 1961
- Family Oplitidae Johnston, 1968
- Family Otopheidomenidae Treat, 1955
- Family Pachylaelapidae Berlese, 1913
- Family Panteniphididae d'Antony, 1987
- Family Paramegistidae Trägårdh, 1946
- Family Parantennulidae Willmann, 1940
- Family Parasitidae Oudemans, 1901
- Family Parholaspidae Evans, 1956 accepted as Parholaspididae Evans, 1956
- Family Parholaspididae Evans, 1956
- Family Pelorocelaenopsidae accepted as Megacelaenopsidae R.C. Funk, 1975
- Family Phaulodinychidae Berlese, 1917
- Family Philodanidae Kethley, 1977
- Family Phymatodiscidae Kontschán & Ermilov, 2023
- Family Physalozerconidae Kethley, 1977
- Family Phytoseidae accepted as Phytoseiidae Berlese, 1916
- Family Phytoseiidae Berlese, 1916
- Family Pneumophionyssidae Fonseca, 1940
- Family Podocinidae Berlese, 1913
- Family Poecilochiridae Willmann, 1940 accepted as Parasitidae Oudemans, 1901
- Family Polyaspidae Berlese, 1913 accepted as Polyaspididae Berlese, 1913
- Family Polyaspididae Berlese, 1913
- Family Polyaspidiidae Zoological Record accepted as Polyaspididae Berlese, 1913
- Family Promegistidae Kethley, 1977
- Family Protodinychidae Evans, 1957
- Family Ptochacaridae Kethley, 1977
- Family Pyrosejidae E.E. Lindquist & M.L. Moraza, 1993
- Family Raillietiidae Vitzthum, 1943
- Family Rhinonyssidae Trouessart, 1895
- Family Rhodacaridae Oudemans, 1902
- Family Saltiseiidae Walter, 2000
- Family Saprogamasidae
- Family Schizogyniidae Trägårdh, 1950
- Family Seiodidae Kethley, 1977
- Family Sejidae Berlese, 1885
- Family Spelaeorhynchidae Oudemans, 1902
- Family Spinturnicidae Oudemans, 1902
- Family Teranyssidae Halliday, 2006
- Family Thinozerconidae Halbert, 1915
- Family Trachytidae Tragärdh, 1938
- Family Trachyuropodidae Berlese, 1917
- Family Trematurellidae Trägårdh, 1944 accepted as Trematuridae Berlese, 1917
- Family Trematuridae Berlese, 1917
- Family Trichoaspididae Y.M. Gu, C.S. Wang & J.H. Li, 1991
- Family Trigonuropodidae Hirschmann in Wisniewski, 1979
- Family Triplogyniidae R.C. Funk, 1977
- Family Uroactinidae Hirschmann & Zirngiebl-Nicol, 1964 accepted as Uroactiniidae
- Family Uroactiniidae
- Family Urodinychidae Berlese, 1917
- Family Uronyssidae Halliday, 2006
- Family Uropodellidae Camin, 1955
- Family Uropodidae Kramer, 1881
- Family Uropodina (awaiting allocation)
- Family Varroidae Delfinado & Baker, 1974
- Family Veigaiaidae accepted as Veigaiidae Oudemans, 1939
- Family Veigaidae accepted as Veigaiidae Oudemans, 1939
- Family Veigaiidae Oudemans, 1939
- Family Vitzthumegistidae Kim, 2015
- Family Zerconidae Berlese, 1892
- Genus Berzercon Seeman & Baker, 2013
- 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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