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
- Order Opilioacarida
- Order Opiliocariformes
- Order Opiliones
- Order Opilionida accepted as Opiliones
- Order Oribatida
- Family Acaronychidae Grandjean, 1932
- Family Aceremaeidae accepted as Arceremaeidae Balogh, 1972
- Family Achipteriidae Thor, 1929
- Family Adelphacaridae Grandjean, 1954
- Family Adhaesozetidae Hammer, 1973
- Family Adhesozetidae Hammer, 1966 accepted as Adhaesozetidae Hammer, 1973
- Family Aleurodamaeidae Paschoal & Johnston, 1984
- Family Aleurodameidae Paschoal & Johnston, 1982 accepted as Aleurodamaeidae Paschoal & Johnston, 1984
- Family Allonothridae Lee, 1985 accepted as Trhypochthoniidae Willmann, 1931
- Family Ameridae Bulanova-Zakhvatkina, 1957
- Family Amerobelbidae Grandjean, 1954
- Family Amerobelboidea incertae sedis
- Family Ameronothridae Willmann, 1931
- Family Ametroproctidae Subías, 2004
- Family Anderemaeidae Balogh, 1972
- Family Aphelacaridae Grandjean, 1954
- Family Aquanothridae Engelbrecht, 1975 accepted as Ameronothridae Willmann, 1931
- Family Arborichthoniidae Balogh & Balogh, 1992
- Family Arceremaeidae Balogh, 1972
- Family Archaeorchestidae Arillo & Subias, 2000 †
- Family Archeonothridae Grandjean, 1932
- Family Archoplophoridae Grandjean, 1965
- Family Areozetidae Balogh & Balogh, 1984
- Family Aribatidae Aoki, Takaku & Ito, 1994
- Family Astegistidae Balogh, 1961
- Family Atopochthoniidae Grandjean, 1948
- Family Austrachipteriidae Luxton, 1985
- Family Autognetidae Grandjean, 1960
- Family Banksinomidae Kunst, 1971
- Family Basilobelbidae Balogh, 1961
- Family Belbidae Willmann, 1931 accepted as Damaeidae Berlese, 1896
- Family Belbodamaeidae Bulanova-Zachvatkina, 1967 accepted as Damaeidae Berlese, 1896
- Family Birobatidae Balogh & Balogh, 1984
- Family Borhidiidae Balogh, 1983
- Family Brachychthoniidae Thor, 1934
- Family Brazilobatidae Koçak & Kemal, 2008
- Family Caleremaeidae Grandjean, 1965
- Family Caloppiidae Balogh, 1961 accepted as Zetorchellidae Özdikmen, 2008
- Family Camisiidae Oudemans, 1900
- Family Campbellobatidae Aoki, 1974
- Family Carabocepheidae Mahunka, 1986
- Family Carabodidae C.L. Koch, 1837
- Family Carbolohmanniidae Sidorchuk & Robin in Robin et al., 2016 †
- Family Cepheidae Berlese, 1896 accepted as Compactozetidae Luxton, 1988
- Family Ceratokalummidae Balogh, 1970
- Family Ceratoppiidae Kunst, 1971
- Family Ceratozetidae Jacot, 1925
- Family Ceresellidae Pavlitshenko, 1993
- Family Cerocepheidae Subías, 2004
- Family Chamobatidae Grandjean, 1954
- Family Charassobatidae Grandjean, 1958
- Family Chaunoproctidae Balogh, 1961
- Family Chaviniidae Balogh, 1983
- Family Collohmanniidae Grandjean, 1958
- Family Compactozetidae Luxton, 1988
- Family Cosmochthoniidae Grandjean, 1947
- Family Crassoribatulidae
- Family Crotonidae accepted as Crotoniidae Thorell, 1876
- Family Crotoniidae Thorell, 1876
- Family Ctenacaridae Grandjean, 1954
- Family Ctenobelbidae Grandjean, 1965
- Family Cuneoppidae Balogh, 1983 accepted as Cuneoppiidae Balogh, 1983
- Family Cuneoppiidae Balogh, 1983
- Family Cymbaeremaeidae Sellnick, 1928
- Family Cymbaeremeidae Willmann, 1931 accepted as Cymbaeremaeidae Sellnick, 1928
- Family Damaeidae Berlese, 1896
- Family Damaeolidae Grandjean, 1965
- Family Dampfiellidae Balogh, 1961
- Family Dendroeremaeidae Behan-Pelletier, Eamer & Clayton, 2005
- Family Devonacaridae Norton, 1988 †
- Family Drymobatidae J. Balogh & P. Balogh, 1984
- Family Elliptochthoniidae R.A. Norton, 1975
- Family Enantioppiidae Balogh, 1983
- Family Eniochthoniidae Grandjean, 1947
- Family Epactozetidae Grandjean, 1930
- Family Epilohmanniidae Oudemans, 1923
- Family Epimerellidae N. Ayyildiz & M. Luxton, 1989
- Family Eremaeidae Kramer, 1877
- Family Eremaeozetidae Balogh, 1972
- Family Eremellidae Balogh, 1961
- Family Eremobelbidae Balogh, 1961
- Family Eremulidae Grandjean, 1965
- Family Eulohmanniidae Grandjean, 1931
- Family Euphthiracaridae Jacot, 1930
- Family Eutegaeidae Balogh, 1965
- Family Eutegeidae accepted as Eutegaeidae Balogh, 1965
- Family Euzetidae Grandjean, 1954
- Family Fenicheliidae J. Balogh & P. Balogh, 1984
- Family Fortuyniidae van der Hammen, 1960
- Family Galapagacaridae Balogh, 1985 accepted as Hermanniidae Sellnick, 1928
- Family Galumnellidae Piffl, 1970
- Family Galumnidae Jacot, 1925
- Family Gehypochthoniidae Strenzke, 1963
- Family Genavensiidae Mahunka, 1983 accepted as Ceratokalummidae Balogh, 1970
- Family Granuloppiidae Balogh, 1983
- Family Gustaviidae Oudemans, 1900
- Family Gymnodamaeidae Grandjean, 1954
- Family Hammeriellidae A.D. Paschoal, 1989
- Family Haplochthoniidae van der Hammen, 1959
- Family Haplozetidae Grandjean, 1936
- Family Hemileiidae Balogh & Balogh, 1984
- Family Hermanniellidae Grandjean, 1934
- Family Hermanniidae Sellnick, 1928
- Family Heterobelbidae Balogh, 1961
- Family Heterochthoniidae Grandjean, 1954
- Family Hexoppiidae Balogh, 1983
- Family Holonothridae Wallwork, 1963 accepted as Crotoniidae Thorell, 1876
- Family Humerobatidae Grandjean, 1970
- Family Hungarobelbidae Miko & Trave, 1996 accepted as Damaeidae Berlese, 1896
- Family Hydrozetidae Grandjean, 1954
- Family Hypochthoniidae Berlese, 1910
- Family Idiodamaeidae Paschoal, 1987
- Family Idiozetidae Aoki, 1976
- Family Kodiakellidae Hammer, 1967
- Family Lamellareidae Balogh, 1972
- Family Lessiriidae Oudemans, 1917 accepted as Epilohmanniidae Oudemans, 1923
- Family Liacaridae Sellnick, 1928
- Family Licneremaeidae Grandjean, 1931
- Family Licneremaeoidea (awaiting allocation)
- Family Licnobelbidae Grandjean, 1965
- Family Licnodamaeidae Grandjean, 1954
- Family Liebstadiidae Balogh & Balogh, 1984
- Family Limnozetidae Grandjean, 1954
- Family Liodidae Grandjean, 1954 accepted as Neoliodidae Sellnick, 1928
- Family Lohmaniidae Berlese, 1916 accepted as Lohmanniidae Berlese, 1916
- Family Lohmanniidae Berlese, 1916
- Family Luxtoniidae Mahunka, 2001
- Family Lyrifissellidae A.D. Paschoal, 1989
- Family Lyrifissiellidae Paschoal, 1989
- Family Lyroppiidae Balogh, 1983
- Family Machadobelbidae Balogh, 1972
- Family Machuellidae Balogh, 1983
- Family Malaconothridae Berlese, 1916
- Family Maorizetidae Luxton, 1985
- Family Maudheimiidae J. Balogh & P. Balogh, 1984
- Family Megeremaeidae Woolley & Higgins, 1968
- Family Mesoplophoridae Jacot, 1923
- Family Metrioppiidae Balogh, 1943 accepted as Peloppiidae Balogh, 1943
- Family Micreremidae Grandjean, 1954
- Family Microtegeidae Balogh, 1972
- Family Microzetidae Grandjean, 1936
- Family Mochlozetidae Grandjean, 1960
- Family Multoribulidae Balogh, 1972
- Family Mycobatidae Grandjean, 1954
- Family Nacunansellidae Fernandez & Cleva, 1998
- Family Nanhermanniidae Sellnick, 1928
- Family Nanohystricidae Norton & Fuangarworn, 2015
- Family Nasobatidae Balogh, 1972
- Family Nehypochthoniidae Norton & Metz, 1980
- Family Neoeutegaeidae Colloff, 2023
- Family Neoliodidae Sellnick, 1928
- Family Neotrichozetidae Balogh, 1965
- Family Nesozetidae J. Balogh & P. Balogh, 1984
- Family Neuhypochthoniidae accepted as Nehypochthoniidae Norton & Metz, 1980
- Family Niphocepheidae Travé, 1959
- Family Nipobodidae Aoki, 1959 accepted as Nippobodidae Aoki, 1959
- Family Nippobodidae Aoki, 1959
- Family Nodocepheidae Piffl, 1972
- Family Nooliodidae Paschoal, 1989
- Family Nosybeidae Mahunka, 1993
- Family Nosybelbidae Mahunka, 1994
- Family Nothridae Berlese, 1896
- Family Onychobatidae Luxton, 1985
- Family Opiidae accepted as Oppiidae Grandjean, 1954
- Family Oppidae accepted as Oppiidae Grandjean, 1954
- Family Oppiidae Grandjean, 1954
- Genus Abchasiella Gordeeva & Tarba, 1990
- Genus Aciculoppia Subías & Rodriguez, 1986 accepted as Oxyoppia Balogh & Mahunka, 1969
- Genus Acoppia Zoological Record accepted as Acroppia Balogh, 1983
- Genus Acroppia Balogh, 1983
- Genus Acutoppia Balogh, 1983
- Genus Aeroppia Hammer, 1961
- Genus Aeroppia Balogh, 1965
- Genus Aethioppia Balogh, 1983
- Genus Afroppia Koçak & Kemal, 2008
- Genus Alcioppia Balogh, 1983 accepted as Ramusella Hammer, 1962
- Genus Amalops Hull, 1916 accepted as Oppia C.L. Koch, 1836
- Genus Amboroppia Ermilov & Starý, 2022
- Genus Amerigloboppia Subías in Subías & Balogh, 1989 accepted as Neoamerioppia Subías in Subías & Balogh, 1989
- Genus Amerioppia Hammer, 1961
- Genus Ameroppia Zoological Record accepted as Amerioppia Hammer, 1961
- Genus Amolops Hull, 1916 accepted as Ramusella Hammer, 1962
- Genus Ancestroppia Subías & Rodriguez, 1986 accepted as Neotrichoppia Subías & Iturrondobeitia, 1980
- Genus Anerioppia Zoological Record accepted as Amerioppia Hammer, 1961
- Genus Anomaloppia Subías, 1978
- Genus Antennoppia Mahunka, 1983 accepted as Lasiobelba Aoki, 1959
- Genus Antenoppia Zoological Record accepted as Lasiobelba Aoki, 1959
- Genus Antilloppia Mahunka, 1985 accepted as Neoppia Bhattacharya & Banerjee, 1981
- Genus Apograptoppia Subias & Rodriguez, 1985 accepted as Graptoppia Balogh, 1983
- Genus Arcoppia Hammer, 1977
- Genus Austroppia Balogh, 1983
- Genus Autognata Hull, 1916 accepted as Oppia C.L. Koch, 1836
- Genus Autoppia Golosova & Karppinen, 1983
- Genus Baioppia Luxton, 1985
- Genus Baloghoppia Mahunka, 1983
- Genus Basidoppia Mahunka, 1983
- Genus Basiloppia Balogh, 1983
- Genus Belloppia Hammer, 1968
- Genus Berniniella Balogh, 1983
- Genus Berninniella Zoological Record accepted as Berniniella Balogh, 1983
- Genus Bicristoppia Subías in Subias & Balogh, 1989 accepted as Lanceoppia Hammer, 1962
- Genus Bioppia Mahunka & Guido Paoletti, 1984 accepted as Ramusella Hammer, 1962
- Genus Bioppia Mahunka, 1983 accepted as Ramusella Hammer, 1962
- Genus Bipectinoppia Subías & Shtanchaeva, 2011 accepted as Rhinoppia Balogh, 1983
- Genus Brachiopiella
- Genus Brachioppia Hammer, 1961
- Genus Brachioppiella Hammer, 1962
- Genus Brachyoppia Zoological Record accepted as Brachioppia Hammer, 1961
- Genus Brachyoppiella Zoological Record accepted as Brachioppiella Hammer, 1962
- Genus Branchioppia Zoological Record accepted as Brachioppia Hammer, 1961
- Genus Brassoppia Balogh, 1983
- Genus Campbelloppia Luxton, 1985
- Genus Canaloppia Mahunka & Palacios-Vargas, 1998 accepted as Berniniella Balogh, 1983
- Genus Cassioppia Poltavska, 1994
- Genus Chavinia Hammer, 1961
- Genus Cheloppia Hammer, 1971 †
- Genus Chuoppia Tseng, 1982
- Genus Cilioppia Balogh, 1983 accepted as Oppia C.L. Koch, 1836
- Genus Condyloppia Balogh, 1983
- Genus Confinoppia Subías & Rodriguez, 1986 accepted as Neotrichoppia Subías & Iturrondobeitia, 1980
- Genus Congoppia Balogh, 1983
- Genus Convergoppia Balogh, 1983
- Genus Corynoppia Balogh, 1983
- Genus Cosmoppia Balogh, 1983 accepted as Dissorhina Hull, 1916
- Genus Cryptoppia Csiszár, 1961
- Genus Ctenoppia Balogh, 1983
- Genus Ctenoppiella Gordeeva & Karppinen, 1988 accepted as Lauroppia Subías & Minguez, 1986
- Genus Cubaoppia Balogh, 1983
- Genus Cycloppia Balogh, 1983
- Genus Cylindroppia Subías & Rodriguez, 1986 accepted as Discoppia Balogh, 1983
- Genus Daedaloppia Hauser & Mahunka, 1983 accepted as Lasiobelba Aoki, 1959
- Genus Damaeoppia Ohkubo, 1995
- Genus Damaeosoma Berlese, 1896 accepted as Oppia C.L. Koch, 1836
- Genus Dameosoma Berlese, 1887 accepted as Oppia C.L. Koch, 1836
- Genus Damoeosoma Berlese, 1913 accepted as Oppia C.L. Koch, 1836
- Genus Decoroppia Mahunka, 2009
- Genus Dentoppia Gordeeva in Gordeeva & Bajartogtokh, 2001 accepted as Tetroppia Gordeeva, 1999
- Genus Discoppia Balogh, 1983
- Genus Dissorhina Hull, 1916
- Genus Dividoppia Mahunka, 1987 accepted as Subiasella Balogh, 1983
- Genus Dosangoppia Ermilov & Frolov, 2019 accepted as Ramusella Hammer, 1962
- Genus Drepanoppia Balogh, 1983
- Genus Drukoppia Gordeeva in Gordeeva & Bajartogtokh, 2001 accepted as Tetroppia Gordeeva, 1999
- Genus Dysarcoppia Mahunka & Palacios-Vargas, 1998 † accepted as Arcoppia Hammer, 1977
- Genus Dzarogneta Kuliev, 1978 accepted as Oxyoppia Balogh & Mahunka, 1969
- Genus Elaphoppia Balogh, 1983
- Genus Eremaeus Koch in Panzer, 1835
- Genus Eremeus Walckenaer & Gervais, 1847 accepted as Eremaeus Koch in Panzer, 1835
- Genus Eremoeus Nicolet, 1855 accepted as Eremaeus Koch in Panzer, 1835
- Genus Erioppia Balogh, 1983
- Genus Exanthoppia Balogh & Balogh, 1983
- Genus Fineoppia Khanbeki & Gordee, 1991
- Genus Foraminoppia Subias & Arillo, 1998
- Genus Fossoppia Mahunka, 1994
- Genus Foveolatoppia Mahunka, 1988
- Genus Frondoppia Mahunka, 1983 accepted as Graptoppia Balogh, 1983
- Genus Furculoppia Balogh, 1983 accepted as Multioppia Hammer, 1961
- Genus Fusuloppia Balogh, 1983
- Genus Gaptoppia Zoological Record accepted as Graptoppia Balogh, 1983
- Genus Geminoppia Balogh & Balogh, 1983
- Genus Gigantoppia Mahunka, 2008
- Genus Gittella Hammer, 1961
- Genus Glabroppia Subías & Rodriguez, 1986 accepted as Karenella Hammer, 1962
- Genus Globoppia Hammer, 1962
- Genus Goyoppia Balogh, 1983
- Genus Graptoppia Balogh, 1983
- Genus Gressittoppia Balogh, 1983
- Genus Hammeroppia Vasiliu & Ivan, 2009 accepted as Multioppia Hammer, 1961
- Genus Hamoppia Hammer, 1968
- Genus Hanoiella Ermilov & Starý, 2018 accepted as Niloppia Balogh, 1983
- Genus Helioppia Balogh, 1983
- Genus Heteroppia Balogh, 1970
- Genus Hypogeoppia Subías, 1981
- Genus Insculptopia Subias & Rodriguez, 1986 accepted as Ramusella Hammer, 1962
- Genus Insculptoppia Subías, 1980
- Genus Insculptoppiella Subías & Rodriguez, 1986 accepted as Ramusella Hammer, 1962
- Genus Intermedioppia Subías & Rodriguez, 1987
- Genus Javieroppia Mínguez & Subias, 1986
- Genus Jermyia Mahunka, 2002
- Genus Joboppia Ruiz, Mínguez & Subías, 1988 accepted as Neoppia Bhattacharya & Banerjee, 1981
- Genus Karenella Hammer, 1962
- Genus Kokoppia Balogh, 1983
- Genus Ktenoppiella Zoological Record accepted as Lauroppia Subías & Minguez, 1986
- Genus Kulievia Vasiliu & Ivan, 2000
- Genus Kunoppia Mahunka, 1987 accepted as Medioppia Subías & Minguez, 1985
- Genus Lalmoppia Subías & Rodriguez, 1986 accepted as Subiasella Balogh, 1983
- Genus Laminoppia Hammer, 1968 †
- Genus Lancelalmoppia Subías in Subias & Balogh, 1989 accepted as Lanceoppia Hammer, 1962
- Genus Lanceoppia Balogh, 1965
- Genus Lanceoppia Hammer, 1962
- Genus Lancetoppia Hammer, 1968 accepted as Lanceoppia Hammer, 1962
- Genus Laroppia Subías in Subias & Balogh, 1989
- Genus Lasiobelba Aoki, 1959
- Genus Lauroppia Subías & Minguez, 1986
- Genus Lemuroppia Mahunka, 1994
- Genus Leptoppia Mahunka, 1997
- Genus Liacaroppia Subías & Rodriguez, 1986
- Genus Lineoppia Balogh & Balogh, 1983
- Genus Loboppia Balogh, 1983
- Genus Lucioppia Mahunka, 1985 accepted as Subiasella Balogh, 1983
- Genus Luisumaoppia Ermilov, 2022
- Genus Mahnertella Mahunka, 1997 accepted as Rugoppia Mahunka, 1986
- Genus Mahunkella Balogh, 1983
- Genus Medioppia Subías & Minguez, 1985
- Genus Medioxyoppia Subías in Subias & Balogh, 1989
- Genus Membranoppia Hammer, 1968 †
- Genus Microppia Balogh, 1983
- Genus Mimoppia Balogh, 1983
- Genus Minoricoppia Perez-Inigo, 1992 accepted as Pseudoamerioppia Subías in Subias & Balogh, 1989
- Genus Miroppia Hammer, 1968
- Genus Moritziella Balogh, 1983 accepted as Moritzoppia Subías & Rodriguez, 1989
- Genus Moritzoppia Subías & Rodriguez, 1989
- Genus Moritzoppiella Gordeeva, 2000
- Genus Multilanceoppia Subías in Subias & Balogh, 1989 accepted as Multioppia Hammer, 1961
- Genus Multimedioppia Subías, 1991
- Genus Multioppia Hammer, 1961
- Genus Multioppia Balogh, 1965
- Genus Multipulchroppia Subías in Subias & Balogh, 1989 accepted as Pulchroppia Hammer, 1979
- Genus Mystroppia Balogh, 1959
- Genus Neoamerioppia Subías in Subías & Balogh, 1989
- Genus Neoppia Bhattacharya & Banerjee, 1981
- Genus Neostrinatina Mahunka, 1980
- Genus Neotrichoppia Subías & Iturrondobeitia, 1980
- Genus Nesoppia Luxton, 1985
- Genus Niloppia Balogh, 1983
- Genus Octoppia Balogh & Mahunka, 1969 †
- Genus Oligoppia Balogh, 1983
- Genus Operculoppia Hammer, 1968 †
- Genus Oppia C.L. Koch, 1836
- Genus Oppiella Jacot, 1937
- Genus Oppites Pampaloni †
- Genus Otoppia Balogh, 1983
- Genus Oxybrachioppia Zoological Record accepted as Oxybrachyoppia Subías in Subias & Balogh, 1989
- Genus Oxybrachyoppia Subías in Subias & Balogh, 1989
- Genus Oxymystroppia Subías & Shtanchaeva, 2011
- Genus Oxyopiella Subias & Rodriguez, 1986 accepted as Oxyoppia Balogh & Mahunka, 1969
- Genus Oxyoppia Balogh & Mahunka, 1969
- Genus Oxyoppiella Subías & Rodriguez, 1986 accepted as Oxyoppia Balogh & Mahunka, 1969
- Genus Oxyoppioides Subías & Minguez, 1985
- Genus Paraeroppia Sanyal, 2009 accepted as Aeroppia Hammer, 1961
- Genus Paragloboppia Subias, 1989 accepted as Vietoppia Mahunka, 1988
- Genus Paralalmoppia Subías & Shtanchaeva, 2012 accepted as Subiasella Balogh, 1983
- Genus Paramedioppia Mahunka & Mahunka-Papp, 2000
- Genus Pararamusella Mahunka & Palacios-Vargas, 1998
- Genus Pararectoppia Mahunka, 1987 accepted as Subiasella Balogh, 1983
- Genus Parasynoppia Aoki, 1983 accepted as Elaphoppia Balogh, 1983
- Genus Paroppia Hammer, 1968
- Genus Paternoppia Gil-Martin, Subias & Arillo, 2000
- Genus Pectinoppia Subías & Rodriguez, 1986 accepted as Oxyoppia Balogh & Mahunka, 1969
- Genus Perspicuoppia Perez-Inigo, 1971 † accepted as Oppiella Jacot, 1937
- Genus Plaesioppia Balogh, 1983 accepted as Brassoppia Balogh, 1983
- Genus Pletzenoppia Balogh, 1983
- Genus Pluritrichoppia Subías & Arillo, 1989
- Genus Polyoppia Hammer, 1968 †
- Genus Porrhoppia Balogh, 1970
- Genus Praoppiella Miko, Mourek, Meleg & Moldovan, 2012 †
- Genus Pravoppia Luxton, 1985
- Genus Processoppia Balogh, 1983
- Genus Pseudoamerioppia Subías in Subias & Balogh, 1989
- Genus Pseudobranchiopiella Zoological Record accepted as Pseudobranchioppiella Tseng, 1982
- Genus Pseudobranchioppiella Tseng, 1982
- Genus Pseudomultioppia Subías, 2018
- Genus Ptiloppia Balogh, 1983
- Genus Pulchroppia Hammer, 1979
- Genus Pulchroppiella Balogh, 1983
- Genus Pustuloppia Mahunka, 1994
- Genus Quattoppiella Hugo-Coetzee, 2014 accepted as Oppiella Jacot, 1937
- Genus Quinquoppia Tseng, 1982
- Genus Quintanoppia Ermilov & Kontschán, 2023 accepted as Amboroppia Ermilov & Starý, 2022
- Genus Radamoppia Mahunka, 1994
- Genus Ramonoppia Morell, 1989
- Genus Ramuloppia Balogh, 1961
- Genus Ramusella Hammer, 1962
- Genus Ramuselloppia Subías & Rodriguez, 1986
- Genus Rectoppia Subías, 1980 accepted as Ramusella Hammer, 1962
- Genus Reductoppia Balogh, 1984 accepted as Similoppia Mahunka, 1983
- Genus Rhaphoppia Balogh, 1983
- Species Rhaphoppia mihelcici (Hammer, 1968)
- Species Rhaphoppia sphagnicola Balogh & Balogh, 1986 accepted as Processoppia sphagnicola (Balogh & Balogh, 1986)
- Genus Rhinoppia Balogh, 1983
- Genus Rhinoppioides Miko, Mourek, Meleg & Moldovan, 2012 †
- Genus Rugoppia Mahunka, 1986
- Genus Sabahoppia Mahunka, 1987 accepted as Ramusella Hammer, 1962
- Genus Sacculoppia Balogh & Mahunka, 1968
- Genus Sceletoppia Mahunka & Mahunka-Papp, 2009
- Genus Selenoppia Hammer, 1968 accepted as Solenoppia
- Genus Separatoppia Mahunka, 1983
- Genus Serratoppia Subías & Minguez, 1985
- Genus Setoppia Balogh, 1983
- Genus Setuloppia Balogh, 1983
- Genus Similoppia Mahunka, 1983
- Genus Solenoppia
- Genus Sphagnoppia Balogh & Balogh, 1986
- Genus Stachyoppia Balogh, 1961
- Genus Stakarenoppia Subías & Rodriguez, 1986 accepted as Karenella Hammer, 1962
- Genus Stenoppia Balogh, 1983 accepted as Graptoppia Balogh, 1983
- Genus Striatioppia Zoological Record accepted as Striatoppia Balogh, 1958
- Genus Striatoppia Balogh, 1958
- Genus Subiasella Balogh, 1983
- Genus Tainsculptoppia Subías & Shtanchaeva, 2011
- Genus Taiwanoppia Tseng, 1982
- Genus Tanzoppia Mahunka, 1988
- Genus Tectoppia Wallwork, 1961
- Genus Tectoppiella Mahunka, 1984 accepted as Setoppia Balogh, 1983
- Genus Teratoppia Balogh, 1959
- Genus Tetroppia Gordeeva, 1999
- Genus Trapezoppia Balogh & Mahunka, 1969 †
- Genus Trematoppia Balogh, 1964
- Genus Tripiloppia Hammer, 1968
- Genus Tuberoppia Golosova in Golosova & Tarba, 1974 †
- Genus Ugandoppia Mahunka, 1998
- Genus Uroppia Balogh, 1983
- Genus Varioppia Mahunka, 1985
- Genus Vietoppia Mahunka, 1988
- Genus Wallworkella Balogh, 1983 accepted as Wallworkoppia Subías in Subias & Balogh, 1989
- Genus Wallworkoppia Subías in Subias & Balogh, 1989
- Genus Xenoppia Mahunka, 1982
- Genus Zetobelba Hull, 1916 accepted as Oppia C.L. Koch, 1836
- Family Oribatellidae Jacot, 1925
- Family Oribatida (awaiting allocation)
- Family Oribatida incertae sedis
- Family Oribatidae
- Family Oribatina incertae sedis
- Family Oribatulidae Thor, 1929
- Family Oribatuliidae accepted as Oribatulidae Thor, 1929
- Family Oribellidae Kunst, 1971
- Family Oribotritiidae Grandjean, 1954
- Family Oripodidae Jacot, 1925
- Family Oripodoidea incertae sedis
- Family Otocepheidae Balogh, 1961
- Family Oxyameridae Aoki, 1965
- Family Palaeacaridae Grandjean, 1932
- Family Palaeosomata incertae sedis
- Family Pantelozetidae Kunst, 1971 accepted as Thyrisomidae Grandjean, 1953
- Family Papillonotidae Balogh, 1983
- Family Parakalummatidae accepted as Parakalummidae Grandjean, 1936
- Family Parakalummidae Grandjean, 1936
- Family Parakalumnidae Grandjean, 1936 accepted as Parakalummidae Grandjean, 1936
- Family Parallonothridae Badejo, Woas & Beck, 2002
- Family Parapirnodidae Aoki, 1974
- Family Parhypochthoniidae Grandjean, 1932
- Family Passalozetidae Grandjean, 1954
- Family Pedrocortesellidae Paschoal, 1987
- Family Pelopidae Ewing, 1917 accepted as Phenopelopidae Petrunkevitch, 1955
- Family Peloppiidae Balogh, 1943
- Family Perlohmaniidae accepted as Perlohmanniidae Grandjean, 1954
- Family Perlohmanniidae Grandjean, 1954
- Family Phenopelopidae Petrunkevitch, 1955
- Family Pheroliodidae Paschoal, 1987
- Family Phthiracaridae Perty, 1841
- Family Phyllochthoniidae Travé, 1967
- Family Pirnodidae Grandjean, 1956
- Family Plasmobatidae Grandjean, 1961
- Family Plateremaeidae Trägårdh, 1926
- Family Platyameridae J. Balogh & P. Balogh, 1983
- Family Podacaridae Grandjean, 1955
- Family Podopterogaeidae Piffl, 1972 accepted as Carabodidae C.L. Koch, 1837
- Family Podopterotegaeidae Piffl, 1972 accepted as Carabodidae C.L. Koch, 1837
- Family Polypterozetidae Grandjean, 1959
- Family Prothoplophoridae Ewing, 1917
- Family Protochthoniidae Norton, 1988 †
- Family Protoplophoridae Jacot, 1923
- Family Protoribatidae Balogh & Balogh, 1984
- Family Psammochthoniidae Fuangarworn & Norton, 2013
- Family Pseudoppiidae Mahunka, 1976 accepted as Oribatulidae Thor, 1929
- Family Pterobatidae Balogh & Mahunka, 1977 accepted as Brazilobatidae Koçak & Kemal, 2008
- Family Pterochthoniidae Grandjean, 1950
- Family Pterozetidae M. Luxton, 1988
- Family Punctoribatidae Thor, 1937
- Family Quadroppiidae Balogh, 1983
- Family Ramsayellidae Luxton, 1985
- Family Rhynchoribatidae Balogh, 1961
- Family Rioppiidae Balogh & Mahunka, 1977
- Family Sabahtritiidae Mahunka, 1987 accepted as Oribotritiidae Grandjean, 1954
- Family Scheloribatidae Jacot, 1935
- Family Scutovertecidae accepted as Scutoverticidae Grandjean, 1954
- Family Scutoverticidae Grandjean, 1954
- Family Selenoribatidae Schuster, 1963
- Family Sellnickiidae Balogh & Balogh, 1984
- Family Sphaerochthoniidae Grandjean, 1947
- Family Spherochthoniidae accepted as Sphaerochthoniidae Grandjean, 1947
- Family Spinozetidae Balogh, 1972
- Family Staurobatidae Grandjean, 1966
- Family Steganacaridae Niedbala, 1986
- Family Stelechobatidae Grandjean, 1965
- Family Sternoppiidae Balogh & Mahunka, 1969
- Family Suctobelbidae Grandjean, 1954
- Family Symbioribatidae Aoki, 1966
- Family Synichotritiidae Walker, 1965
- Family Tectocepheidae Grandjean, 1954
- Family Tegeocranellidae P. Balogh, 1987
- Family Tegoribatidae Grandjean, 1954
- Family Temburongiidae Mahunka, 1990
- Family Tenuialidae Jacot, 1929
- Family Teratoppiidae Balogh, 1983
- Family Tetracondylidae Aoki, 1961
- Family Thyriosomidae Grandjean, 1953 accepted as Thyrisomidae Grandjean, 1953
- Family Thyrisomidae Grandjean, 1953
- Family Thyrosomidae Grandjean, 1953 accepted as Thyrisomidae Grandjean, 1953
- Family Tikizetidae Luxton, 1985
- Family Tokunocepheidae Aoki, 1966
- Family Trhypochthonidae Willmann, 1931 accepted as Trhypochthoniidae Willmann, 1931
- Family Trhypochthoniidae Willmann, 1931
- Family Trizetidae Ewing, 1917
- Family Tubulozetidae P. Balogh, 1989
- Family Tumerozetidae Hammer, 1966
- Family Tuparezetidae Balogh, 1972
- Family Ulugurozetidae Mahunka, 1984 accepted as Ramsayellidae Luxton, 1985
- Family Unduloribatidae Kunst, 1971
- Family Xenillidae Woolley & Higgins, 1966
- Family Xenolohmannidae Balogh & Mahunka, 1969 accepted as Lohmanniidae Berlese, 1916
- Family Xylobatidae J. Balogh & P. Balogh, 1984
- Family Zetomimidae Shaldybina, 1966
- Family Zetomotrichidae Grandjean, 1934
- Family Zetorchellidae Özdikmen, 2008
- Family Zetorchestidae Michael, 1898
- 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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