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
- Genus Asiatolaelaps Fain, 1961
- Genus Chironobius Lombert & Moss, 1983
- Genus Ixobiodes Zoological Record accepted as Ixobioides Fonseca, 1934
- Species Ixobiodes brachispinosus Lizaso, 1983 accepted as Ixobioides brachispinosus (Lizaso, 1983)
- Genus Ixobioides Fonseca, 1934
- Genus Ixodorhynchoides Johnston, 1962
- Genus Ixodorhynchus Ewing, 1923
- Genus Ophiogongylus Lombert & Moss, 1983
- Genus Scutanolaelaps Lavoipierre, 1959
- Genus Strandtibbettsia Fain, 1961
- Family Klinckowstroemiidae Trägårdh, 1950
- Family Laelapidae Berlese, 1892
- 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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