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
- Family Acaridae Ewing & Nesbitt, 1942
- Family Acaroidea incertae sedis
- Family Aeroglyphidae Zakhvatkin, 1941
- Family Algophagidae Fain, 1974
- Family Alloptidae Gaud, 1957
- Family Analgesidae Trouessart, 1915 accepted as Analgidae Trouessart & Mégnin, 1884
- Family Analgidae Trouessart & Mégnin, 1884
- Family Anoetidae Oudemans, 1904 accepted as Histiostomatidae Berlese, 1897
- Family Apionacaridae Gaud & Atyeo, 1977
- Family Ascouracaridae Gaud & Atyeo, 1976
- Family Atopomelidae Gunther, 1942
- Family Audycoptidae Lavoipierre, 1964
- Family Avenzoariidae Oudemans, 1905
- Family Bochkovocoptidae OConnor, 2019
- Family Caminosioptidae Green, 1989 accepted as Laminosioptidae Vitzthum, 1931
- Family Canestriniidae Berlese, 1884
- Family Carpoglyphidae Oudemans, 1923
- Family Carpolglyphidae accepted as Carpoglyphidae Oudemans, 1923
- Family Caudiferidae Gaud & Atyeo, 1978
- Family Chaetodactylidae Zakhvatkin, 1941
- Family Chetochelacaridae Fain, 1987
- Family Cheylabididae Gaud, 1983
- Family Chirodiscidae Trouessart, 1892
- Family Chirorhynchobiidae Fain, 1967
- Family Chortoglyphidae Berlese, 1897
- Family Cnemidocoptidae accepted as Knemidokoptidae Dubinin, 1953
- Family Crypturoptidae Gaud, Atyeo & Berla, 1972
- Family Cytoditidae Oudemans, 1908
- Family Cytoleichidae Canestrini, 1892 accepted as Cytoditidae Oudemans, 1908
- Family Czenspinskiidae Oudemans, 1927 accepted as Winterschmidtiidae Oudemans, 1923
- Family Dermationidae Fain, 1965
- Family Dermoglyphidae Mégnin & Trouessart, 1884
- Family Echimyopodidae Fain, 1967
- Family Epidermoptidae Trouessart, 1892
- Family Euglycyphagidae Fain & Philips, 1977
- Family Eustathiidae Oudemans, 1905
- Family Evansacaridae Fain, 1962 accepted as Knemidokoptidae Dubinin, 1953
- Family Faculiferidae accepted as Falculiferidae Oudemans, 1905
- Family Falculiferidae Oudemans, 1905
- Family Freyanidae Dubinin, 1953
- Family Freyanoidae accepted as Freyanidae Dubinin, 1953
- Family Gabuciniidae Gaud & Atyeo, 1975
- Family Galagalgidae Fain, 1963
- Family Gastronyssidae Fain, 1956
- Family Gaudiellidae Atyeo, Baker & Delfinado, 1974
- Family Gaudoglyphidae W.A. Bruce & Johnston, 1976
- Family Glaesacaridae Klimov & Sidorchuk, 2011 †
- Family Glycacaridae Griffiths, 1977
- Family Glycyphagidae Berlese, 1887
- Family Guanolichidae Fain, 1968
- Family Hemisarcoptidae Oudemans, 1908
- Family Heterocoptidae Fain, 1967
- Family Heteropsoridae Oudemans, 1908
- Family Histiostomatidae Berlese, 1897
- Family Hyadesidae accepted as Hyadesiidae Halbert, 1915
- Family Hyadesiidae Halbert, 1915
- Family Hyperoderidae Murray, 1877 accepted as Hypoderidae Murray, 1877
- Family Hypodectidae Fain & Bafort, 1966 accepted as Hypoderidae Murray, 1877
- Family Hypoderatidae accepted as Hypoderidae Murray, 1877
- Family Hypoderidae Murray, 1877
- Family Kiwilichidae Dabert, 1994
- Family Knemidocoptidae Dubinin, 1953 accepted as Knemidokoptidae Dubinin, 1953
- Family Knemidokoptidae Dubinin, 1953
- Family Kramerellidae Gaud & Mouchet, 1961
- Family Kytoditidae Oudemans, 1908
- Family Laminosioptidae Vitzthum, 1931
- Family Lardoglyphidae Oudemans, 1927
- Family Lemanniellidae Wurst, 2001 accepted as Suidasiidae Hughes, 1948
- Family Lemurnyssidae Fain, 1957
- Family Levantoglyphidae Klimov, Vorontsov, Azar, Sidorchuk, Braig, Khaustov & Tolstikov, 2021 †
- Family Linobiidae Oudemans, 1908 accepted as Hemisarcoptidae Oudemans, 1908
- Family Listrophoridae Canestrini, 1892
- Family Listropsoralgidae Fain, 1965
- Family Lobalgidae Fain, 1965
- Family Lophonotacaridae Fain, 1987
- Family Myialgesidae Trouessart, 1907 accepted as Epidermoptidae Trouessart, 1892
- Family Myocoptidae Gunther, 1942
- Family Nanacaridae Oudemans, 1923 accepted as Hemisarcoptidae Oudemans, 1908
- Family Nodipalpidae Oudemans, 1923 accepted as Histiostomatidae Berlese, 1897
- Family Ochrolichidae Gaud & Atyeo, 1978
- Family Oconnoriidae Gaud, Atyeo & Klompen, 1989
- Family Ovacaridae Gaud & Atyeo, 1975
- Family Pedetopodidae
- Family Pedetropodidae accepted as Pedetopodidae
- Family Pneumocoptidae Fain, 1957
- Family Proctophyllodidae Mégnin & Trouessart, 1884
- Family Psoralgidae Oudemans, 1908
- Family Psoroptidae G. Canestrini, 1892
- Family Psoroptoididae Gaud, 1983
- Family Pterolichidae Trouessart & Mégnin, 1884
- Genus Aegothelichus Atyeo, 1979
- Genus Afrolichus Gaud & Atyeo, 1996
- Genus Ambodrilus Gaud & Atyeo, 1996
- Genus Anapodema Gaud & Mouchet, 1959
- Genus Aniacarus Gaud & Atyeo, 1990
- Genus Aniibius Gaud & Atyeo, 1990
- Genus Aniibus Gaud & Atyeo, 1990 accepted as Aniibius Gaud & Atyeo, 1990
- Genus Anoplotarsus Gaud & Atyeo, 1996
- Genus Apatelacarus Atyeo & Gaud, 1980
- Genus Apexolichus Gaud & Atyeo, 1996
- Genus Aphyllochaeta Dubinin, 1956 accepted as Montchadskiana Dubinin, 1951
- Genus Aralichus Gaud, 1966
- Genus Aramobius Gaud & Atyeo, 1996
- Genus Ardeacarus Dubinin, 1951
- Genus Ardeialges Gaud & Mouchet, 1959
- Genus Arhytidelasma Gaud & Atyeo, 1996
- Genus Ascetolichus Pérez & Atyeo, 1990
- Genus Astrolabelichus Dabert, Badek & Skoracki, 2007
- Genus Aterolichus Gaud, 1980
- Genus Atopolichus Gaud, 1980
- Genus Atrichotibia Atyeo & Gaud, 1984
- Genus Avenzoariurus Atyeo, 1985
- Genus Botryaspis Atyeo, 1992 accepted as Botryaspsis Atyeo, 1992
- Genus Botryaspsis Atyeo, 1992
- Genus Cacatolichus Mironov & Perez, 2003
- Genus Calvolichus Gaud & Atyeo, 1996
- Genus Calyptolichus Mironov & Dabert, 2007
- Genus Ceratolichus Dabert, Mironov & Ehrnsberger, 2004
- Genus Ceratothrix Trouessart, 1916
- Genus Charmosylichus Dabert, Mironov & Ehrnsberger, 2004
- Genus Chelomatolichus Gaud & Atyeo, 1996
- Genus Clastonotus Gaud, 1966
- Genus Coccylichus Gaud, 1966
- Genus Colinolichus Gaud & Atyeo, 1996
- Genus Contolichus Atyeo & Gaud, 1992
- Genus Coracopsobius Gaud & Atyeo, 1996
- Genus Ctenodiscopus Gaud, 1980
- Genus Cycloprotarsus Atyeo, 1992 †
- Genus Cynthiura Hull, 1932 accepted as Pseudalloptes Mégnin & Trouessart, 1883
- Genus Cyrtonyxobius Gaud & Atyeo, 1996
- Genus Delphinurus Gaud & Atyeo, 1996
- Genus Dicranogonus Atyeo & Gaud, 1987 accepted as Diodochaetus Gaud & Atyeo, 1996
- Genus Diodochaetus Gaud & Atyeo, 1996
- Genus Distigmesikya Atyeo, Gaud & Perez, 1984
- Genus Doleracarus Atyeo & Gaud, 1980
- Genus Dubiniania Gaud & Mouchet, 1959
- Genus Echinofemur Atyeo & Perez, 1984
- Genus Echinozonus Atyeo & Perez, 1991
- Genus Epistomolichus Mironov, Pérez & Palma, 2009
- Genus Epoplichus Zoological Record accepted as Epopolichus Gaud, 1981
- Genus Epopolichus Gaud, 1981
- Genus Eurypterolichus Atyeo, 1992
- Genus Falcolichus Gaud & Atyeo, 1996
- Genus Gabuciniella Gaud & Atyeo, 1996
- Genus Gaudiomouchetus Özdikmen, 2008
- Genus Genoprotolichus Gaud & Atyeo, 1996
- Genus Geranolichus Gaud, 1968
- Genus Goniodurus Atyeo, 1992
- Genus Grallobia Hull, 1932
- Genus Grallolichus Gaud, 1960
- Genus Gruolichus Atyeo & Windingstad, 1979
- Genus Gymnolichus Gaud & Mouchet, 1961
- Genus Haptepigynus Atyeo, 1992 †
- Genus Heliaspis Atyeo, 1992
- Genus Herodialges Gaud, 1981
- Genus Ibidonemoma Gaud & Atyeo, 1996
- Genus Kakapolichus Mironov & Perez, 2003
- Genus Leipobius Atyeo, 1992
- Genus Lopharalichus Gaud & Atyeo, 1996
- Genus Lorilichus Atyeo & Gaud, 1991
- Genus Loriprotolichus Mironov & Dabert, 2007
- Genus Madagascaracarus Dubinin, 1956 accepted as Madagascaracarus Gaud, 1979
- Genus Madagascaracarus Gaud, 1979
- Genus Magimelia Gaud, 1961
- Genus Maleolichus Atyeo, 1992
- Genus Mastigodiscus Atyeo & Gaud, 1984
- Genus Mayracarus Atyeo, 1992
- Genus Megapodobius Atyeo, 1992 †
- Genus Mesolichus Trouessart, 1899
- Genus Micropsittophagus Mironov & Perez, 2003
- Genus Montchadskiana Dubinin, 1951
- Genus Musophagobius Gaud & Atyeo, 1996
- Genus Neardeacarus Gaud & Atyeo, 1996
- Genus Neorhytidelasma Mironov & Perez, 2003
- Genus Nestorilichus Mironov & Dabert, 2007
- Genus Nyctibiolichus Atyeo, 1979
- Genus Nymphicilichus Mironov & Galloway, 2002
- Genus Opisthocomacarus Dubinin, 1955
- Genus Opisthocomacarus Dubinin, 1953 accepted as Opisthocomacarus Dubinin, 1955
- Genus Ornatumerus Gaud & Atyeo, 1996
- Genus Oxygynurus Atyeo, 1992
- Genus Pararalichus Atyeo, 1989
- Genus Pavolichus Gaud, 1965
- Genus Pelargodacna Perez & Atyeo, 1992
- Genus Pelargolichus Gaud, 1982
- Genus Pereziella Atyeo, 1990
- Genus Periexocaulus Gaud & Atyeo, 1996
- Genus Phasidolichus Gaud & Atyeo, 1996
- Genus Phycoferus Atyeo & Perez, 1991
- Genus Pilochaeta Dubinin, 1956
- Genus Prionoturus Atyeo, 1992
- Genus Protolichus Trouessart, 1884
- Genus Pseudalloptes Mégnin & Trouessart, 1883
- Genus Pseudalloptinus Dubinin, 1956
- Genus Pseudolichus Atyeo & Gaud, 1992
- Species Pseudolichus phasiani Mironov, 1997
- Species Pseudolichus solutocurtus (Dubinin, 1956)
- Genus Psittocolus Gaud & Atyeo, 1996
- Genus Psittrichobius Mironov & Perez, 2003
- Genus Pterolichus Robin, 1868
- Genus Pterolychus Mégnin, 1879 accepted as Pterolichus Robin, 1868
- Genus Pterygocrusolichus Dubinin, 1955
- Genus Ptyssalgopus Gaud & Atyeo, 1996
- Genus Rhynchocaulus Gaud & Berla, 1963
- Genus Rhytidelasma Gaud, 1966
- Genus Scolaralichus Gaud & Atyeo, 1996
- Genus Scopusacarus Dubinin, 1956
- Genus Scopusacarus Dubinin, 1953 accepted as Scopusacarus Gaud & Mouchet, 1959
- Genus Scopusacarus Gaud & Mouchet, 1959
- Genus Sideroferus Gaud & Atyeo, 1996
- Genus Stakyonemus Atyeo & Gaud, 1971 †
- Genus Struthiopterolichus Dubinin, 1953 accepted as Struthiopterolichus Dubinin, 1955
- Genus Struthiopterolichus Dubinin, 1955
- Genus Synapsilobus Gaud & Atyeo, 1996
- Genus Szeptyckiana Dabert & Labrzycka, 2009
- Genus Taeniosikya Gaud, 1961
- Genus Talegallobius Atyeo, 1992
- Genus Tamnurolichus Gaud & Atyeo, 1996
- Genus Tanyaralichus Gaud & Atyeo, 1996
- Genus Tanysomacarus Atyeo, 1992
- Genus Tetraolichus Atyeo & Gaud, 1992
- Genus Titanolichus Gaud & Atyeo, 1996
- Genus Touracobia Gaud & Mouchet, 1959
- Genus Triphyllochaeta Dubinin, 1956
- Genus Turnixacarus Gaud & Atyeo, 1996
- Genus Uropsittacolichus Atyeo & Perez, 1982
- Genus Xiphiurus Gaud & Mouchet, 1959 accepted as Gaudiomouchetus Özdikmen, 2008
- Genus Xoloptes Canestrini, 1879
- Genus Xoloptoides Gaud & Mouchet, 1959
- Family Pteronyssidae Oudemans, 1941
- Family Ptiloxenidae J. Gaud, 1982
- Family Ptyssalgidae Atyeo & Gaud, 1979
- Family Pyroglyphidae Cunliffe, 1958
- Family Rectijanuidae Gaud, 1961
- Family Rhynchoptidae accepted as Rhyncoptidae Lawrence, 1956
- Family Rhyncoptidae Lawrence, 1956
- Family Rosensteiniidae Cooreman, 1954
- Family Sapracaridae Fain, 1988
- Family Saproglyphidae Oudemans, 1924
- Family Sarcoptidae Murray, 1877
- Family Schizoglyphidae Mahunka, 1978
- Family Suidasiidae Hughes, 1948
- Family Syringobiidae Trouessart, 1897
- Family Thoracosathesidae Gaud & Mouchet, 1959
- Family Thysanocercidae Atyeo & Peterson, 1972
- Family Troglotacaridae Fain, 1977
- Family Trouessartiidae Gaud, 1957
- Family Turbinoptidae Fain, 1957
- Family Tyroglyphidae
- Family Vexillariidae Gaud & Mouchet, 1959
- Family Winterschmidtiidae Oudemans, 1923
- Family Xolalgidae Dubinin, 1953
- 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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