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
- Family Acanthoctenidae Simon, 1892 accepted as Ctenidae Keyserling, 1877
- Family Acattymidae Kishida, 1930 accepted as Antrodiaetidae Gertsch, 1940
- Family Acrometidae Wunderlich, 1979 †
- Family Actinopodidae Simon, 1892
- Family Adjutoridae Petrunkevitch, 1942 †
- Family Agelenidae Simon, 1898
- Family Aliendiguetidae Wunderlich & Müller, 2020 †
- Family Amaurobiidae L. Koch, 1868
- Family Ammoxenidae Simon, 1893
- Family Amphinectidae Forster & Wilton, 1973 accepted as Desidae Pocock, 1895
- Family Anamidae Simon, 1889
- Family Anapidae Simon, 1895
- Family Ancylometidae Hazzi, Wood & Hormiga, 2024
- Family Antrodiaetidae Gertsch, 1940
- Family Anyphaenidae Bertkau, 1878
- Family Aphantochilidae Thorell, 1873 accepted as Thomisidae Sundevall, 1833
- Family Aranae incertae sedis
- Family Araneae (awaiting allocation)
- Family Araneidae Clerck, 1758
- Family Araneoidea incertae sedis
- Family Archaeidae Koch & Berendt, 1854
- Family Archaeometidae Petrunkevitch, 1949 †
- Family Archoleptonetidae Gertsch, 1974
- Family Argiopidae Simon, 1890 accepted as Araneidae Clerck, 1758
- Family Argyronetidae Menge, 1869
- Family Arkyidae Koch, 1872
- Family Arthrodictynidae Petrunkevitch, 1942 †
- Family Arthrolycosidae Fric, 1904 †
- Family Arthromygalidae Petrunkevitch, 1923 †
- Family Atracidae Hogg, 1901
- Family Attidae accepted as Salticidae Blackwall, 1841
- Family Atypidae Thorell, 1870
- Family Atypoidea incertae sedis †
- Family Austrochilidae Zapfe, 1955
- Family Aviculariidae Simon, 1874 †
- Family Baltsuccinidae Wunderlich, 2004 †
- Family Barychelidae Simon, 1889
- Family Bemmeridae Simon, 1903
- Family Borboropactidae Wunderlich, 2004 accepted as Thomisidae Sundevall, 1833
- Family Burmascutidae Wunderlich, 2008 †
- Family Burmorsolidae Wunderlich, 2015 †
- Family Calommatoidae Thorell, 1887 accepted as Atypidae Thorell, 1870
- Family Caponidae Simon, 1887 accepted as Caponiidae Simon, 1890
- Family Caponiidae Simon, 1890
- Family Cheiracanthiidae Wagner, 1887
- Family Chimerarachnidae Wunderlich, 2019 †
- Family Chummidae Jocqué, 2001 accepted as Amaurobiidae L. Koch, 1868
- Family Cicurinidae Pickard-Cambridge, 1893
- Family Cithaeronidae Simon, 1893
- Family Clubionidae Simon, 1895
- Family Clubionoidea (awaiting allocation)
- Family Copaldictynidae Wunderlich, 2004 †
- Family Corinnidae Karsch, 1880
- Family Crassicephalidae Wunderlich, 2021 †
- Family Cryptothelidae L. Koch, 1872 accepted as Zodariidae Simon, 1892
- Family Ctenidae Keyserling, 1877
- Family Ctenizidae Thorell, 1887
- Family Cyatholipidae Simon, 1894
- Family Cybaeidae Simon, 1898
- Family Cycloctenidae Simon, 1898
- Family Cyrtaucheniidae Simon, 1892
- Family Deinopidae C.L. Koch, 1850
- Family Desidae Pocock, 1895
- Family Dictynidae O. Pickard-Cambridge, 1871
- Family Diguetidae F.O. Pickard-Cambridge, 1899
- Family Dinopidae accepted as Deinopidae C.L. Koch, 1850
- Family Dipluridae Simon, 1889
- Family Dolomedidae Simon, 1876
- Family Drassidae Sundevall, 1833 accepted as Gnaphosidae Pocock, 1898
- Family Drassodidae Petrunkevitch, 1942 † accepted as Gnaphosidae Pocock, 1898
- Family Drymusidae Simon, 1893
- Family Dubiodeinopsidae Wunderlich, 2021 †
- Family Dubiouloboridae Wunderlich, 2021 †
- Family Dysderidae C.L. Koch, 1837
- Family Entypesidae Bond, Opatova & Hedin, 2020
- Family Eopsilodercidae Wunderlich, 2008 †
- Family Eotibiaapophysidae Wunderlich, 2018 †
- Family Epeiridae Sundevall, 1833 accepted as Araneidae Clerck, 1758
- Family Ephalmatoridae Petrunkevitch, 1958 †
- Family Eresidae C.L. Koch in Berendt, 1845
- Family Erigonidae Gerhardt, 1923 accepted as Linyphiidae Blackwall, 1859
- Family Euagridae Raven, 1979
- Family Euctenizidae Raven, 1985
- Family Eusparassidae †
- Family Filistatidae Simon, 1864
- Family Fonteferreidae Wunderlich, 2013
- Family Fonteferridae Wunderlich, 2013 accepted as Fonteferreidae Wunderlich, 2013
- Family Fossilcalcaridae Wunderlich, 2015 †
- Family Gallieniellidae Millot, 1947
- Family Gigarachnidae Jiang & Li, 2020 †
- Family Gnaphosidae Pocock, 1898
- Family Gradungulidae Forster, 1955
- Family Grandoculidae Penney, 2011 †
- Family Hahniidae Bertkau, 1878
- Family Halidae Jocqué, 1994
- Family Halonoproctidae Pocock, 1901
- Family Heptathelidae Kishida, 1923
- Family Hersiliidae Thorell, 1869
- Family Heteropodidae Thorell, 1873
- Family Hexathelidae Simon, 1892
- Family Hexuridae Simon, 1889 accepted as Antrodiaetidae Gertsch, 1940
- Family Hickmaniidae accepted as Austrochilidae Zapfe, 1955
- Family Holarchaeidae Forster & Platnick, 1984
- Family Homalonychidae Simon, 1893
- Family Huttoniidae Simon, 1893
- Family Hypochilidae Marx, 1888
- Family Idiopidae Simon, 1892
- Family Inceptoridae Petrunkevitch, 1942 †
- Family Insecutoridae Petrunkevitch, 1942 †
- Family Ischnothelidae Pickard-Cambridge, 1897
- Family Juraraneidae Eskov, 1984 †
- Family Lagonomegopidae Eskov & Wunderlich, 1995 †
- Family Lamponidae Simon, 1893
- Family Leptonetidae Simon, 1890
- Family Linyphiidae Blackwall, 1859
- Family Liocranidae Simon, 1897
- Family Liphistiidae Thorell, 1869
- Family Lipistiidae accepted as Liphistiidae Thorell, 1869
- Family Lipistiiidae accepted as Liphistiidae Thorell, 1869
- Family Loxoscelidae Gertsch, 1949
- Family Lycosidae Sundevall, 1833
- Family Lyssomanidae Peckham & Wheeler, 1888 accepted as Salticidae Blackwall, 1841
- Family Macrobunidae Bonnet, 1957
- Family Macrothelidae Simon, 1892
- Family Malkaridae Davies, 1980
- Family Mecicobothriidae Holmberg, 1882
- Family Mecysmaucheniidae Simon, 1895
- Family Megasetidae Wunderlich, 2021 †
- Family Metidae Simon, 1894 accepted as Tetragnathidae Menge, 1866
- Family Micromygalidae Platnick & Forster, 1982
- Family Micropalpimanidae Wunderlich, 2008 †
- Family Micropholcommatidae Hickman, 1943 accepted as Anapidae Simon, 1895
- Family Microstigmatidae Roewer, 1942
- Family Micryphantidae Bertkau, 1872
- Family Migidae Simon, 1892
- Family Mimetidae Simon, 1895
- Family Miturgidae Simon, 1885
- Family Mongolarachnidae Selden, Shih & Ren, 2013 †
- Family Myrmecicultoridae Ramírez, Grismado & Ubick, 2019
- Family Mysmenidae Petrunkevitch, 1928
- Family Nanoaenigmatidae Wunderlich, 2023 †
- Family Nemesiidae Simon, 1889
- Family Neolanidae Forster & Wilton, 1973
- Family Nephilidae
- Family Nesticidae Simon, 1894
- Family Nicodamidae Simon, 1898
- Family Ochyroceratidae Fage, 1912
- Family Oecobiidae Blackwall, 1862
- Family Oonopidae Simon, 1892
- Family Orsolobidae Cooke, 1965
- Family Oxyopidae Thorell, 1870
- Family Pachygnathidae Menge, 1866 accepted as Tetragnathidae Menge, 1866
- Family Pacullidae
- Family Palpimanidae Thorell, 1870
- Family Palpimanoidea incertae sedis
- Family Pararchaeidae Forster & Platnick, 1984
- Family Paratropididae Simon, 1889
- Family Parattidae Petrunkevitch, 1922 †
- Family Parvosegestriidae Wunderlich in Wunderlich & Müller, 2020 †
- Family Penestomidae Simon, 1903
- Family Periegopidae Simon, 1893
- Family Permarachnidae Eskov & Selden, 2005 †
- Family Philodromidae Thorell, 1870
- Family Pholcidae Simon, 1874
- Family Pholcochyroceridae Wunderlich, 2008 †
- Family Phrurolithidae Banks, 1892
- Family Phyxelididae Lehtinen, 1967
- Family Pilosarachnidae Jiang & Li, 2020 †
- Family Pimoidae Wunderlich, 1986
- Family Pisauridae Simon, 1897
- Family Planarchaeidae Wunderlich, 2017 †
- Family Platoridae
- Family Plectreuridae Simon, 1893
- Family Plumorsolidae Wunderlich, 2008 †
- Family Praepholcidae Wunderlich, 2017 †
- Family Praeterleptonetidae Wunderlich, 2008 †
- Family Praetheridiidae Wunderlich, 2004 †
- Family Prodidomidae Simon, 1884
- Family Protheridiidae Wunderlich, 2004 †
- Family Psechridae Simon, 1892
- Family Psilodercidae Machado, 1951
- Family Pycnothelidae Chamberlin, 1917
- Family Pyritaraneidae Petrunkevitch, 1953 †
- Family Rhytidicolidae Simon, 1903
- Family Salticidae Blackwall, 1841
- Family Salticoididae Wunderlich, 2008 †
- Family Scutuloboridae Wunderlich, 2021 †
- Family Scytodidae Blackwall, 1864
- Family Segestriidae Petrunkevitch, 1933
- Family Selenopidae Simon, 1897
- Family Senoculidae Simon, 1890
- Family Sicariidae Keyserling, 1880
- Family Sinopimoidae Li & Wunderlich, 2008
- Family Sparassidae Bertkau, 1872
- Family Spatiatoridae Petrunkevitch, 1942 †
- Family Stasimopidae Bond, Opatova & Hedin in Opatova et al., 2020
- Family Stenochilidae Thorell, 1873
- Family Stiphidiidae Dalmas, 1917
- Family Succinomidae Wunderlich, 2008 †
- Family Symphytognathidae Hickman, 1931
- Family Synaphridae Wunderlich, 1986
- Family Synotaxidae Simon, 1894
- Family Telemidae Fage, 1913
- Family Tengellidae Dahl, 1908 accepted as Zoropsidae Simon, 1892
- Family Tetrablemmidae Pickard-Cambridge, 1873
- Family Tetragnathidae Menge, 1866
- Family Thaididae Lehtinen, 1967 accepted as Austrochilidae Zapfe, 1955
- Family Theraphosidae Thorell, 1869
- Family Theridiidae Sundevall, 1833
- Genus Acanthomysmena Mello-Leitão, 1944 accepted as Euryopis Menge, 1868
- Genus Achaea O. Pickard-Cambridge, 1882 accepted as Achaearanea Strand, 1929
- Genus Achaearanea Strand, 1929
- Genus Achaearyopa Barrion & Litsinger, 1995
- Genus Achaeridion Wunderlich, 2008 †
- Genus Adansonia Saville-Kent, 1897
- Genus Adelosimus Simon, 1894 accepted as Anelosimus Simon, 1891
- Genus Allodipoena Bryant, 1947 accepted as Wamba Cambridge, 1897
- Genus Allotheridion Archer, 1946 accepted as Theridion Walckenaer, 1805
- Genus Allothymoites Ono, 2007
- Genus Ameridion Wunderlich, 1994
- Genus Amphiledorus Jocqué & Bosmans, 2001
- Genus Anatea Berland, 1927
- Genus Anatolidion Wunderlich, 2008 †
- Genus Ancocoelus Simon, 1894 accepted as Steatoda Sundevall, 1833
- Genus Ancylorrhanis Simon, 1894 accepted as Pholcomma Thorell, 1869
- Genus Anelosimus Simon, 1891
- Genus Arctachaea Levi, 1957 accepted as Chrysso Cambridge, 1882
- Genus Argyria Yaginuma, 1957 accepted as Chrysso Cambridge, 1882
- Genus Argyroaster Yaginuma, 1958 accepted as Chrysso Cambridge, 1882
- Genus Argyrodella Saaristo, 2006
- Genus Argyrodes Simon, 1864
- Genus Argyrodina Strand, 1928 accepted as Argyrodes Simon, 1864
- Genus Argyroelus Hogg, 1922 accepted as Steatoda Sundevall, 1833
- Genus Ariadne Doleschall, 1857
- Genus Ariamne O. Pickard-Cambridge, 1872 accepted as Ariamnes Thorell, 1869
- Genus Ariamnes Thorell, 1869
- Genus Armigera Marples, 1956 accepted as Pholcomma Thorell, 1869
- Genus Asagena Sundevall, 1833 accepted as Steatoda Sundevall, 1833
- Genus Asagenella Schenkel, 1937 accepted as Steatoda Sundevall, 1833
- Genus Asteron Jocqué, 1991
- Genus Astodipoena Petrunkevitch, 1958 †
- Genus Asygna Agnarsson, 2006
- Genus Asygyna Agnarsson, 2006
- Genus Ataulfo O. Pickard-Cambridge, 1896 accepted as Stemmops Cambridge, 1894
- Genus Atkinia Strand, 1929 accepted as Euryopis Menge, 1868
- Genus Atkinsonia O. Pickard-Cambridge, 1880 accepted as Euryopis Menge, 1868
- Genus Audifia Keyserling, 1884
- Genus Balticoridion Wunderlich, 2008 †
- Genus Balticpholcomma Wunderlich, 2008 †
- Genus Bardala Saaristo, 2006
- Genus Billima Simon, 1908 accepted as Theridion Walckenaer, 1805
- Genus Borneoridion Deeleman & Wunderlich, 2011
- Genus Brontosauriella Bristowe, 1938 accepted as Thymoites Keyserling, 1884
- Genus Brunepisinus Yoshida & Koh, 2011
- Genus Cabello Levi, 1964
- Genus Cameronidion Wunderlich, 2011
- Genus Canalidion Wunderlich, 2008 †
- Genus Carniella Thaler & Steinberger, 1988
- Species Carniella brignolii Thaler & Steinberger, 1988
- Species Carniella detriticola (Miller, 1970)
- Species Carniella globifera (Simon, 1899)
- Species Carniella krakatauensis Wunderlich, 1995
- Species Carniella orites Knoflach, 1996
- Species Carniella schwendingeri Knoflach, 1996
- Species Carniella siam Knoflach, 1996
- Species Carniella sumatraensis Wunderlich, 1995
- Species Carniella weyersi (Brignoli, 1979)
- Genus Caudasinus Wunderlich, 2008 †
- Genus Cephalobares Cambridge, 1871
- Genus Cerocida Simon, 1894
- Genus Chacoca Badcock, 1932 accepted as Latrodectus Walckenaer, 1805
- Genus Chindellum Archer, 1950 accepted as Wamba Cambridge, 1897
- Genus Chorizopella
- Genus Chrosiotes Simon, 1901 accepted as Chrosiothes Simon, 1894
- Genus Chrosiothes Simon, 1894
- Genus Chrysso Cambridge, 1882
- Genus Clavibertus Wunderlich, 2008 †
- Genus Clavilosimus Wunderlich, 2008 † accepted as Anelosimus Simon, 1891
- Genus Clya Menge in Berendt, 1854 †
- Genus Clya Berendt, 1845 † accepted as Clya Menge in Berendt, 1854 †
- Genus Coleosoma Cambridge, 1882
- Genus Conopistha Karsch, 1881 accepted as Argyrodes Simon, 1864
- Genus Cornutheridion Wunderlich, 2021 †
- Genus Cornutidion Wunderlich, 1988 †
- Genus Coscinida Simon, 1894
- Genus Cretaraneus Selden, 1990 †
- Genus Crustulina Menge, 1868
- Genus Cryptachaea Archer, 1946 accepted as Achaearanea Strand, 1929
- Genus Ctenium Menge, 1871 accepted as Robertus Cambridge, 1879-81
- Genus Cyatholipulus Petrunkevitch, 1930 accepted as Styposis Simon, 1894
- Genus Cyllognatha Koch in Koch (Keyserling), 1872
- Genus Cymbiopholcomma Wunderlich, 2008 †
- Genus Deelemanella Yoshida, 2003
- Genus Diaprocorus Simon, 1894 accepted as Euryopis Menge, 1868
- Genus Dipoena Thorell, 1869
- Genus Dipoenata Wunderlich, 1988
- Genus Dipoenoides Chamberlin, 1925 accepted as Euryopis Menge, 1868
- Genus Dipoenura Simon, 1908
- Genus Echinotheridion Levi, 1963
- Genus Emertonella Bryant, 1945
- Genus Enoplognatha Pavesi, 1880
- Genus Eoasagena Wunderlich, 2008 †
- Genus Eodipoena Petrunkevitch, 1942 †
- Genus Eolyrifer Wunderlich, 2008 †
- Genus Eomysmena Petrunkevitch, 1942 †
- Genus Eoteutana Wunderlich, 2008 †
- Genus Epesinus Banks, 1905 accepted as Episinus Latreille, 1809
- Genus Episinopsis Simon, 1894 accepted as Episinus Latreille, 1809
- Genus Episinus Latreille, 1809
- Genus Eucharia Koch in Panzer, 1835 accepted as Steatoda Sundevall, 1833
- Genus Eucharium Simon, 1864 accepted as Eucharia Koch in Panzer, 1835
- Genus Euryopis Menge, 1868
- Genus Eurypoena Wunderlich, 1991
- Genus Exalbidion Wunderlich, 1994
- Genus Faiditus Keyserling, 1884
- Genus Faitidius Simon, 1894 accepted as Faiditus Keyserling, 1884
- Genus Femurraptor Wunderlich, 2011 †
- Genus Flegia Menge in Berendt, 1854 †
- Genus Flegia Berendt, 1845 † accepted as Flegia Menge in Berendt, 1854 †
- Genus Formicinoides Keyserling, 1884 accepted as Helvibis Keyserling, 1884
- Genus Garricola Chamberlin, 1916 accepted as Thymoites Keyserling, 1884
- Genus Garritus Chamberlin & Ivie, 1933 accepted as Robertus Cambridge, 1879-81
- Genus Glebych Eskov & Marusik, 2021
- Genus Globulidion Wunderlich, 2008 †
- Genus Gmogala Keyserling in Koch (Keyserling), 1890
- Genus Gnophomytis Simon, 1894
- Genus Grancanaridion Wunderlich, 2011
- Genus Gushangzao Lin & Li, 2024
- Genus Gyro Lin & Li, 2024
- Genus Hadrotarsus Thorell, 1881
- Genus Helenidion Sherwood, Marusik, Fowler, Stevens & Joshua, 2024
- Genus Helvibis Keyserling, 1884
- Genus Helvidia Thorell, 1890
- Genus Hentziectypus Archer, 1946 accepted as Achaearanea Strand, 1929
- Genus Heterotheridion Wunderlich, 2008 †
- Genus Hetschkia Keyserling, 1886
- Genus Hirsutipalpus Wunderlich, 2008 †
- Genus Histagonia Simon, 1894
- Genus Histiagonia Banks, 1899 accepted as Histagonia Simon, 1894
- Genus Hubba Cambridge, 1897 accepted as Thymoites Keyserling, 1884
- Genus Hyocrea Simon, 1894 accepted as Episinus Latreille, 1809
- Genus Hypobares Simon, 1894 accepted as Thymoites Keyserling, 1884
- Genus Hyptimorpha Strand, 1906 accepted as Episinus Latreille, 1809
- Genus Icona Forster, 1956
- Genus Imogala Keyserling in Koch (Keyserling), 1890 accepted as Gmogala Keyserling in Koch (Keyserling), 1890
- Genus Jamaitidion Wunderlich, 1994
- Genus Janula Strand, 1932 accepted as Episinus Latreille, 1809
- Genus Janulus Thorell, 1881
- Genus Keijia Yoshida, 2001
- Genus Knoflachia Marusik & Eskov, 2024
- Genus Kochiura Archer, 1950
- Genus Kochiuridion Wunderlich, 2008 †
- Genus Labiodectus Bradley, 1877 accepted as Latrodectus Walckenaer, 1805
- Genus Landoppo Barrion & Litsinger, 1995
- Genus Lasaeola Simon, 1881
- Genus Lathrodectes Banks, 1899 accepted as Latrodectus Walckenaer, 1805
- Genus Lathrodectus Thorell, 1869 accepted as Latrodectus Walckenaer, 1805
- Genus Latrodectes Canestrini & Pavesi, 1869 accepted as Latrodectus Walckenaer, 1805
- Genus Latrodectus Walckenaer, 1805
- Genus Leptasteron Baehr & Jocqué, 2001
- Genus Lithyphantes Thorell, 1869 accepted as Steatoda Sundevall, 1833
- Genus Loxonychia Tullgren in Sjöstedt, 1910 accepted as Coscinida Simon, 1894
- Genus Macaridion Wunderlich, 1991
- Genus Magnopholcomma Wunderlich, 2008 †
- Genus Marianana Georgescu, 1989
- Genus Melos Pickard-Cambridge, 1899
- Genus Meotipa Simon, 1894 accepted as Chrysso Cambridge, 1882
- Genus Meotype Petrunkevitch, 1928 accepted as Chrysso Cambridge, 1882
- Genus Microcephalus Restrepo in Daniel, 1948 accepted as Argyrodes Simon, 1864
- Genus Microtheridion Wunderlich, 2021 †
- Genus Mictodipoena Petrunkevitch, 1958 †
- Genus Mimetidion Wunderlich, 2008 †
- Genus Molione Thorell, 1892
- Genus Moneta Cambridge, 1871
- Genus Monetoculus Wunderlich, 2008 †
- Genus Montanidion Wunderlich, 2011
- Genus Mufila Bryant, 1949 accepted as Euryopis Menge, 1868
- Genus Municeps Petrunkevitch, 1942 †
- Genus Nactodipoena Petrunkevitch, 1942 †
- Genus Nanomysmena Petrunkevitch, 1958 † accepted as Clya Menge in Berendt, 1854 †
- Genus Nanosteatoda Wunderlich, 2008 †
- Genus Nanume Saaristo, 2006
- Genus Neopisinus Marques, Buckup & Lopes Rodrigues, 2011
- Genus Neospintharus Exline, 1950
- Genus Neottiura Menge, 1868
- Genus Nesticodes Archer, 1950
- Genus Nesticoides accepted as Nesticodes Archer, 1950
- Genus Nipponidion Yoshida, 2001
- Genus Obscurpholcomma Wunderlich, 2008 †
- Genus Ohlertidion Wunderlich, 2008 †
- Genus Pachydactylus Menge, 1868 accepted as Lasaeola Simon, 1881
- Genus Paidisca Bishop & Crosby, 1926 accepted as Thymoites Keyserling, 1884
- Genus Paidiscura Archer, 1950
- Genus Paoningia Schenkel, 1937 accepted as Dipoena Thorell, 1869
- Genus Parasteatoda Archer, 1946 accepted as Achaearanea Strand, 1929
- Genus Paratheridula Levi, 1957
- Genus Parvidipoena Wunderlich, 2015 accepted as Lasaeola Simon, 1881
- Genus Penictis Simon, 1894 accepted as Episinus Latreille, 1809
- Genus Pentasteron Baehr & Jocqué, 2001
- Genus Phaetoticus Simon, 1894 accepted as Theridion Walckenaer, 1805
- Genus Philto Simon, 1894 accepted as Thymoites Keyserling, 1884
- Genus Pholcomma Thorell, 1869
- Genus Phoroncidia Westwood, 1835
- Genus Phycosoma Cambridge, 1880
- Genus Phycus Cambridge, 1871
- Genus Phylarchus Simon, 1889 accepted as Euryopis Menge, 1868
- Genus Phyllonethis Thorell, 1869 accepted as Enoplognatha Pavesi, 1880
- Genus Piocamis Petrunkevitch, 1928 accepted as Episinus Latreille, 1809
- Genus Platnickina Koçak & Kemal, 2008
- Genus Plocamis Simon, 1894 accepted as Episinus Latreille, 1809
- Genus Praetereuryopis Wunderlich, 2008 †
- Genus Proboscidula
- Genus Pronepos Petrunkevitch, 1963 †
- Genus Propostira Simon, 1894
- Genus Protosteatoda Wunderlich, 2008 †
- Genus Pselothorax Chamberlin, 1949 accepted as Lasaeola Simon, 1881
- Genus Pseudasteron Jocqué & Baehr, 2001
- Genus Pseudoteutana Wunderlich, 2008 †
- Genus Pycnoepisinus Wunderlich, 2008 †
- Genus Questo Platnick, 2002
- Genus Rhinocosmetus Vanuytven, Jocqué & Deeleman-Reinhold, 2024
- Genus Rhinoliparus Vanuytven, Jocqué & Deeleman-Reinhold, 2024
- Genus Rhomphaea Koch in Koch (Keyserling), 1872
- Genus Robertia Saaristo, 2006 accepted as Seycellesa Koçak & Kemal, 2008
- Genus Robertus Cambridge, 1879-81
- Genus Romphaea Banks, 1895 accepted as Rhomphaea Koch in Koch (Keyserling), 1872
- Genus Ruborridion Wunderlich, 2011
- Genus Rugapholcomma Wunderlich, 2008 †
- Genus Saaristoa Koçak & Kemal, 2008 accepted as Seycellocesa Koçak & Kemal, 2008
- Genus Sardinidion Wunderlich, 1994
- Genus Selimus Saaristo, 2006
- Genus Selkirkiella Berland, 1930
- Genus Sesato Saaristo, 2006
- Genus Seycellesa Koçak & Kemal, 2008
- Genus Simitidion Wunderlich, 1991
- Genus Simonola Wunderlich, 2015 accepted as Lasaeola Simon, 1881
- Genus Spelobion Chamberlin & Ivie, 1938 accepted as Thymoites Keyserling, 1884
- Genus Spheropistha Yaginuma, 1957
- Genus Sphyrotinus Simon, 1894 accepted as Thymoites Keyserling, 1884
- Genus Spinembolia Saaristo, 2006
- Genus Spinisinus Wunderlich, 2008 †
- Genus Spinitharinus Wunderlich, 2008 †
- Genus Spintharus Hentz, 1850
- Genus Steassa Simon, 1910 accepted as Steatoda Sundevall, 1833
- Genus Steatoda Sundevall, 1833
- Genus Stemmops Cambridge, 1894
- Genus Stethopoma Thorell, 1890 accepted as Steatoda Sundevall, 1833
- Genus Stictoxena Simon, 1894 accepted as Dipoena Thorell, 1869
- Genus Stoda Saaristo, 2006
- Genus Styposis Simon, 1894
- Genus Succinobertus Wunderlich, 2008 †
- Genus Succinura Wunderlich, 2008 †
- Genus Sudabe Karsch, 1879 accepted as Phoroncidia Westwood, 1835
- Genus Symopagia Simon, 1894 accepted as Enoplognatha Pavesi, 1880
- Genus Takayus Yoshida, 2001
- Genus Tamanidion Wunderlich, 2011
- Genus Tekellina Levi, 1957
- Genus Tentana Simon, 1896 accepted as Steatoda Sundevall, 1833
- Genus Teutana Simon, 1881 accepted as Steatoda Sundevall, 1833
- Genus Theonoe Simon, 1881
- Genus Theridiella Tullgren in Sjöstedt, 1910 accepted as Coscinida Simon, 1894
- Genus Theridio Simon, 1864 accepted as Theridion Walckenaer, 1805
- Genus Theridion Walckenaer, 1805
- Genus Theridiotis Levi, 1954 accepted as Chrosiothes Simon, 1894
- Genus Theridium Leach, 1816
- Genus Theridula Emerton, 1882
- Genus Thiridium Koch, 1850 accepted as Theridion Walckenaer, 1805
- Genus Tholocco Archer, 1946 accepted as Thymoites Keyserling, 1884
- Genus Thonastica Simon, 1908 accepted as Thymoites Keyserling, 1884
- Genus Thwaitesia Cambridge, 1881
- Genus Thymoella Bryant, 1948 accepted as Thymoites Keyserling, 1884
- Genus Thymoites Keyserling, 1884
- Genus Tidarren Chamberlin & Ivie, 1934
- Genus Tobesoa Keyserling in Koch (Keyserling), 1890
- Genus Tomoxena Simon, 1895
- Genus Topo Exline, 1950 accepted as Thwaitesia Cambridge, 1881
- Genus Triangulum Jiang & Li in Xin et al., 2022 †
- Genus Trichursa Simon, 1908 accepted as Dipoenura Simon, 1908
- Genus Trigonobothrys Simon, 1889 accepted as Phycosoma Cambridge, 1880
- Genus Trithena Simon, 1867 accepted as Phoroncidia Westwood, 1835
- Genus Trust Sherwood, Marusik, Wilkins, P. Ashmole & M. Ashmole, 2024
- Genus Ulesanis Koch, 1871 accepted as Phoroncidia Westwood, 1835
- Genus Umfila Keyserling, 1886 accepted as Dipoena Thorell, 1869
- Genus Unispinatoda Wunderlich, 2008 †
- Genus Vibrada Simon, 1894 accepted as Phoroncidia Westwood, 1835
- Genus Vicipholcomma Wunderlich, 2008 †
- Genus Virada Simon, 1894 accepted as Wirada Keyserling, 1886
- Genus Wamba Cambridge, 1897
- Genus Wibrada Keyserling, 1886 accepted as Phoroncidia Westwood, 1835
- Genus Wirada Keyserling, 1886
- Genus Yaginumena Yoshida, 2002
- Genus Yoroa Baert, 1984
- Genus Yunohamella Yoshida, 2007
- Genus Zercidium Benoit, 1977
- Genus Zodariellum Andreeva & Tyshchenko, 1968
- Family Theridiosomatidae Simon, 1895
- Family Thomisidae Sundevall, 1833
- Family Titanoecidae Lehtinen, 1967
- Family Toxopidae Hickman, 1940
- Family Trachelidae Simon, 1897
- Family Trechaleidae Simon, 1890
- Family Trochanteriidae Karsch, 1879
- Family Trogloraptoridae Griswold, Audisio & Ledford, 2012
- Family Udubidae Polotow, Carmichael & Griswold, 2015
- Family Uloboridae Thorell, 1869
- Family Urocteidae Thorell, 1869 accepted as Oecobiidae Blackwall, 1862
- Family Vetiatoridae Wunderlich, 2015 †
- Family Viridasiidae Lehtinen, 1967
- Family Xenoctenidae Ramírez & Silva-Dávila in Wheeler et al., 2017
- Family Zarqaraneidae Wunderlich, 2008 †
- Family Zodariidae Simon, 1892
- Family Zoridae F.O. Pickard-Cambridge, 1893
- Family Zorocratidae Dahl, 1913 accepted as Zoropsidae Simon, 1892
- Family Zoropsidae Simon, 1892
- Genus Caestaranea Selden, Huang & Garwood, 2019 †
- Genus Onychopalpus Selden, Huang & Garwood, 2019 †
- 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 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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