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
- Genus Abdomegaphobema Sherwood, Gabriel, Peñaherrera-R., Léon-E., Cisneros-Heredia, Brescovit & Lucas, 2023
- Genus Acanthopelma F.O. Pickard-Cambridge, 1897
- Genus Acanthoscurria Ausserer, 1871
- Genus Adranochelia Simon, 1889 accepted as Cyclosternum Ausserer, 1871
- Genus Aenigmarachne Schmidt, 2005
- Genus Agnostopelma Pérez-Miles & Weinmann, 2010
- Genus Amazonius Cifuentes & Bertani, 2022
- Genus Ami Pérez-Miles, 2008
- Genus Ancylochiros Mello-Leitão, 1920 accepted as Avicularia Lamarck, 1818
- Genus Annandaliella Hirst, 1909
- Genus Anoploscelus Pocock, 1897
- Genus Anqasha Sherwood & Gabriel, 2022
- Genus Antikuna Kaderka, Ferretti, West, Lüddecke & Hüsser, 2021
- Genus Antillena Bertani, Huff & Fukushima in Fukushima & Bertani, 2017
- Genus Apachepelma Smith, 1994 accepted as Aphonopelma Pocock, 1901
- Genus Aphonopelma Pocock, 1901
- Genus Ashantia Strand, 1908 accepted as Harpactirella Purcell, 1902
- Genus Aspinochilus Müller, Fardiansah, Schneider, Wanke, von Wirth & Wendt, 2024
- Genus Augacephalus Gallon, 2002
- Genus Avicularia Lamarck, 1818
- Genus Avicuscodra Strand, 1908 accepted as Chaetopelma Ausserer, 1871
- Genus Baccallbrapo Barrion & Litsinger, 1995 accepted as Phlogiellus Pocock, 1897
- Genus Bacillochilus Gallon, 2010
- Genus Barropelma Chamberlin, 1940 accepted as Lasiodora Koch, 1850
- Genus Batesiella Pocock, 1903
- Genus Bermejoa Gabriel, Sherwood & Pérez-Miles, 2023
- Genus Birupes Gabriel & Sherwood, 2019
- Genus Bonnetina Vol, 1999
- Genus Brachionopus Pocock, 1897
- Species Brachionopus annulatus Purcell, 1903
- Species Brachionopus leptopelmiformis Strand, 1907
- Species Brachionopus pretoriae Purcell, 1904
- Species Brachionopus robustus Pocock, 1897
- Species Brachionopus tristis Purcell, 1903
- Genus Brachypelma Simon, 1892
- Genus Brachypelmides Schmidt & Krause, 1994 accepted as Brachypelma Simon, 1892
- Genus Brazilopelma Schmidt, 1998 accepted as Nhandu Lucas, 1983
- Genus Bumba Pérez-Miles, Bonaldo & Miglio, 2014
- Genus Butantania Mello-Leitão, 1935 accepted as Homoeomma Ausserer, 1871
- Genus Calopelma Chamberlin, 1917 accepted as Homoeomma Ausserer, 1871
- Genus Cardiopelma Vol, 1999
- Genus Caribena Fukushima & Bertani, 2017
- Genus Catanduba Yamamoto, Lucas & Brescovit, 2012
- Genus Catumiri Guadanucci, 2004
- Genus Cenobiopelma Mello-Leitão & Arlé, 1934 accepted as Oligoxystre Vellard, 1924
- Genus Ceratogyrus Pocock, 1897
- Genus Ceropelma Mello Leitão, 1923 accepted as Plesiopelma Pocock, 1901
- Genus Chaetopelma Ausserer, 1871
- Genus Chaetorhombus Ausserer, 1871 accepted as Cyclosternum Ausserer, 1871
- Genus Chaetorrhombus Simon, 1889 accepted as Cyclosternum Ausserer, 1871
- Genus Chaunopelma Chamberlin, 1940 accepted as Aphonopelma Pocock, 1901
- Genus Chilobrachys Karsch, 1891
- Genus Chilocosmia Schmidt & von Wirth, 1992 accepted as Selenocosmia Ausserer, 1871
- Genus Chinchaysuyu Ferretti, Chaparro, Ochoa & West, 2023
- Genus Chromatopelma Schmidt, 1995
- Genus Cilantica Mirza, 2024
- Genus Citharacanthus Pocock, 1901
- Genus Citharischius Pocock, 1900
- Genus Citharognathus Pocock, 1895
- Genus Clavopelma Chamberlin, 1940
- Genus Coelogenium Purcell, 1902 accepted as Ceratogyrus Pocock, 1897
- Genus Coremiocnemis Simon, 1892
- Genus Cotztetlana Mendoza Marroquin, 2012
- Genus Crassicrus Reichling & West, 1996
- Genus Cratorrhagus Simon, 1892
- Genus Crypsidromus Ausserer, 1871 accepted as Lasiodora Koch, 1850
- Genus Cubanana Ortiz, 2008
- Genus Cyclosternum Ausserer, 1871
- Genus Cyclothoracoides Strand, 1929 accepted as Hapalotremus Simon, 1903
- Genus Cyclothorax Mello Leitão, 1923 accepted as Hapalotremus Simon, 1903
- Genus Cymbiapophysa Gabriel & Sherwood, 2020
- Genus Cyriocosmus Simon, 1903
- Genus Cyriopagopus Simon, 1887
- Genus Cyrthopholis Tullgren, 1905 accepted as Cyrtopholis Simon, 1892
- Genus Cyrtopholis Simon, 1892
- Genus Cyrtosternum Ausserer, 1875 accepted as Cyrtopholis Simon, 1892
- Genus Davus Cambridge, 1892 accepted as Cyclosternum Ausserer, 1871
- Genus Delopelma Petrunkevitch, 1939 accepted as Aphonopelma Pocock, 1901
- Genus Dolichothele Mello-Leitão, 1923 accepted as Hapalotremus Simon, 1903
- Genus Dryptopelma Simon, 1889 accepted as Cyclosternum Ausserer, 1871
- Genus Dryptopelmides Strand, 1907 accepted as Holothele Karsch, 1879
- Genus Dugesia Berlese, 1883 accepted as Smaris Latreille, 1796
- Genus Dugesiella Pocock, 1901 accepted as Aphonopelma Pocock, 1901
- Genus Encyocratella Strand, 1907 accepted as Chaetopelma Ausserer, 1871
- Genus Encyocrates Simon, 1892
- Genus Ephebopus Simon, 1892
- Genus Erythropoicila Fischel, 1925 accepted as Cyriocosmus Simon, 1903
- Genus Euathlus Ausserer, 1875
- Genus Eucratoscelus Pocock, 1898
- Genus Eumenophorus Pocock, 1897
- Genus Eupalaestrus Pocock, 1901
- Genus Euphrictus Hirst, 1908
- Genus Eurypelma Koch, 1850 accepted as Avicularia Lamarck, 1818
- Genus Eurypelmella Strand, 1907 accepted as Schizopelma Pickard Cambridge, 1897
- Genus Euthycaelus Simon, 1889 accepted as Holothele Karsch, 1879
- Genus Goniodontium Mello-Leitão, 1923 accepted as Hapalotremus Simon, 1903
- Genus Gosipelma Chamberlin, 1940 accepted as Aphonopelma Pocock, 1901
- Genus Grammostola Simon, 1892
- Genus Guyruita Guadanucci, Lucas, Indicatti & Yamamoto, 2007
- Genus Hapalopinus Simon, 1903 accepted as Trichopelma Simon, 1888
- Genus Hapalopus Ausserer, 1875
- Genus Hapalotremus Simon, 1903
- Genus Haplocosmia Schmidt & von Wirth, 1996
- Genus Haplopelma Simon, 1892
- Genus Harpactira Ausserer, 1871
- Genus Harpactirella Purcell, 1902
- Genus Harpaxibius Ausserer, 1871
- Genus Harpaxibus Ausserer, 1871 accepted as Sericopelma Ausserer, 1875
- Genus Harpaxictis Simon, 1892 accepted as Sericopelma Ausserer, 1875
- Genus Harpaxictus Simon, 1892 accepted as Sericopelma Ausserer, 1875
- Genus Hemiercus Simon, 1903
- Genus Hemirrhagus Simon, 1903
- Genus Heterophrictus Pocock, 1900 accepted as Plesiophrictus Pocock, 1899
- Genus Heteroscodra Pocock, 1900
- Genus Heterothele Karsch, 1879
- Genus Holothele Karsch, 1879
- Genus Hysterocrates Simon, 1892
- Genus Idiothele Hewitt, 1919
- Genus Iracema Pérez-Miles, 2000 accepted as Maraca Pérez-Miles, 2005
- Genus Iridopelma Pocock, 1901
- Genus Ischnnocolella Petrunkevitch, 1928 accepted as Plesiophrictus Pocock, 1899
- Genus Ischnocolella Strand, 1907 accepted as Plesiophrictus Pocock, 1899
- Genus Ischnocolinopsis Wunderlich, 1988 †
- Genus Ischnocolus Ausserer, 1871
- Genus Isiboroa Gabriel, Sherwood & Pérez-Miles, 2023
- Genus Jambu Miglio, Perafán & Pérez-Miles, 2024
- Genus Kochiana Fukushima, Nagahama & Bertani, 2008
- Genus Lampropelma Simon, 1892
- Genus Lasiocnemus Ausserer, 1871
- Genus Lasiocyano Galleti-Lima, Hamilton, Borges & Guadanucci, 2023
- Genus Lasiodora Koch, 1850
- Genus Lasiodorides Schmidt & Bischoff, 1997
- Genus Lasiopelma Simon, 1892 accepted as Grammostola Simon, 1892
- Genus Leptofischelia Strand, 1929 accepted as Trichopelma Simon, 1888
- Genus Leptostylus Fischel, 1927 accepted as Leptofischelia Strand, 1929
- Genus Longilyra Gabriel, 2014
- Genus Loxomphalia Simon, 1889
- Genus Loxophobema Simon, 1907 accepted as Phoneyusa Karsch, 1884
- Genus Loxoptygella Strand, 1906 accepted as Loxoptygus Simon, 1903
- Genus Loxoptygus Simon, 1903
- Genus Luphocemus Denis, 1960 accepted as Ischnocolus Ausserer, 1871
- Genus Lycotharses Thorell, 1900 accepted as Hysterocrates Simon, 1892
- Genus Lyrognathus Pocock, 1895
- Genus Magulla Simon, 1892 accepted as Cyclosternum Ausserer, 1871
- Genus Maraca Pérez-Miles, 2005
- Genus Mascaraneus Gallon, 2005
- Genus Megaphobema Pocock, 1901
- Genus Melloleitaoina Pikelin & Schiapelli, 1960
- Genus Melognathus Chamberlin, 1917
- Genus Melopoeus Pocock, 1895 accepted as Haplopelma Simon, 1892
- Genus Merothele Petrunkevitch, 1925 accepted as Trichopelma Simon, 1888
- Genus Metriopelma Becker, 1878
- Genus Monocentropella Strand, 1907 accepted as Citharischius Pocock, 1900
- Genus Monocentropus Pocock, 1897
- Genus Munduruku Miglio, Bonaldo & Pérez-Miles, 2013
- Genus Murphyarachne Sherwood & Gabriel, 2022
- Genus Musagetes Pocock, 1895
- Genus Mygalarachne Ausserer, 1871
- Genus Myostola Simon, 1903
- Genus Neischnocolus Petrunkevitch, 1925 accepted as Lasiodora Koch, 1850
- Genus Neochilobrachys Hirst, 1909 accepted as Phlogiellus Pocock, 1897
- Genus Neoheterophrictus Siliwal & Raven, 2012
- Genus Neostenotarsus Pribik & Weinmann, 2004
- Genus Nesiergus Simon, 1903
- Genus Nesipelma Schmidt & Kovarik, 1996
- Genus Nhandu Lucas, 1983
- Genus Notahapalopus Sherwood, Gabriel, Peñaherrera-R., Osorio, Benavides, Hörweg, Brescovit & Lucas, 2024
- Genus Obaerarius Petrunkevitch, 1926 accepted as Trichopelma Simon, 1888
- Genus Oberarius Petrunkevitch, 1928 accepted as Trichopelma Simon, 1888
- Genus Oligoxystre Vellard, 1924
- Genus Omothymus Thorell, 1891
- Genus Ornithoctonus Pocock, 1892
- Genus Orphnaecus Simon, 1892
- Genus Orphnoecus Simon, 1892 accepted as Orphnaecus Simon, 1892
- Genus Orthnoecus Petrunkevitch, 1928 accepted as Orphnaecus Simon, 1892
- Genus Orthothrichus Karsch, 1880
- Genus Orthotrichus Simon, 1889
- Genus Ozopactus Simon, 1889
- Genus Pachistopelma Pocock, 1901
- Genus Pachypelma Karsch, 1880
- Genus Pachystopelma Simon, 1903 accepted as Pachistopelma Pocock, 1901
- Genus Pachytheca Schmidt, 2012 accepted as Bonnetina Vol, 1999
- Genus Pamphobeteus Pocock, 1901
- Genus Paraphysa Simon, 1892
- Genus Parvicarina Galleti-Lima, Hamilton, Borges & Guadanucci, 2023
- Genus Pelinobius Karsch, 1885 accepted as Phoneyusa Karsch, 1884
- Genus Pella Cambridge, 1892 accepted as Cyclosternum Ausserer, 1871
- Genus Phlogiellus Pocock, 1897
- Genus Phlogiodes Pocock, 1899 accepted as Haploclastus Simon, 1892
- Genus Phlogius Simon, 1888 accepted as Selenocosmia Ausserer, 1871
- Genus Phoneuusa Karsch, 1886 accepted as Phoneyusa Karsch, 1884
- Genus Phoneyusa Karsch, 1884
- Genus Phormictopus Pocock, 1901
- Genus Phormingochilus Pocock, 1895
- Genus Phrictus Koch in Koch (Keyserling), 1873 accepted as Selenocosmia Ausserer, 1871
- Genus Phrixotrichus Simon, 1889 accepted as Euathlus Ausserer, 1875
- Genus Phryxotrichus Simon, 1892 accepted as Euathlus Ausserer, 1875
- Genus Plesiopelma Pocock, 1901
- Genus Plesiophrictus Pocock, 1899
- Genus Poecilotheria Simon, 1885
- Genus Polyspina Schmidt, 1994 accepted as Polyspinosa Schmidt, 1999
- Genus Polyspinosa Schmidt, 1999
- Genus Proshapalopus Mello-Leitão, 1923
- Genus Protertheraphosa Wunderlich in Wunderlich & Müller, 2020 †
- Genus Psalmopoeus Pocock, 1895
- Genus Psednocnemis West, Nunn & Hogg, 2012
- Genus Pseudhapalopus Strand, 1907
- Genus Pseudoclamoris Hüsser, 2018 accepted as Tapinauchenius Ausserer, 1871
- Genus Pseudohomoeomma Mello-Leitão, 1930 accepted as Cyriocosmus Simon, 1903
- Genus Pseudoligoxystre Vol, 2001
- Genus Pseudoschizopelma Smith, 1994
- Genus Pseudotheraphosa Tinter, 1991 accepted as Theraphosa Thorell, 1870
- Genus Pterinochilides Strand, 1920 accepted as Pterinochilus Pocock, 1897
- Genus Pterinochilus Pocock, 1897
- Genus Pterinopelma Pocock, 1901
- Genus Reversopelma Schmidt, 2001
- Genus Rhechostica Simon, 1892 accepted as Aphonopelma Pocock, 1901
- Genus Romopelma Peñaherrera-R., Pinos-Sanchez, Guerrero-Campoverde, León-E. & Cisneros-Heredia, 2024
- Genus Sahydroaraneus Mirza & Sanap, 2014
- Genus Sandinista Longhorn & Gabriel, 2019
- Genus Schismatothele Karsch, 1879
- Genus Schismothele Ausserer, 1880 accepted as Schismatothele Karsch, 1879
- Genus Schizopelma Pickard Cambridge, 1897
- Genus Scodra Becker, 1879 accepted as Stromatopelma Karsch, 1881
- Genus Scopelobates Simon, 1903 accepted as Holothele Karsch, 1879
- Genus Scuria Simon, 1864 accepted as Poecilotheria Simon, 1885
- Genus Scurria Koch, 1850 accepted as Poecilotheria Simon, 1885
- Genus Selenobrachys Schmidt, 1999
- Genus Selenocasmia Pocock, 1899 accepted as Selenocosmia Ausserer, 1871
- Genus Selenocosmia Ausserer, 1871
- Genus Selenogyrus Pocock, 1897
- Genus Selenopelma Schmidt, 1995 accepted as Selenocosmia Ausserer, 1871
- Genus Selenoscomia Hasselt, 1890 accepted as Selenocosmia Ausserer, 1871
- Genus Selenostholus Simon, 1903 accepted as Selenotholus Hogg, 1902
- Genus Selenotholus Hogg, 1902
- Genus Selenotypus Pocock, 1895
- Genus Sericopelma Ausserer, 1875
- Genus Sickius Soares & Camargo, 1948
- Genus Sorata Strand, 1907 accepted as Grammostola Simon, 1892
- Genus Spelopelma Gertsch, 1982 accepted as Hemirrhagus Simon, 1903
- Genus Sphaerobothria Karsch, 1879
- Genus Spinosatibiapalpus Gabriel & Sherwood, 2020
- Genus Stenotarsus Tesmoingt & Schmidt, 2002
- Genus Stichoplastoris Rudloff, 1997
- Genus Stichoplastus Simon, 1889 accepted as Holothele Karsch, 1879
- Genus Stothis Simon, 1889 accepted as Trichopelma Simon, 1888
- Genus Stromatopelma Karsch, 1881
- Genus Strongylothorax André, 1937 accepted as Hapalotremus Simon, 1903
- Genus Taksinus Songsangchote, Sippawat, Khaikaew & Chomphuphuang, 2022
- Genus Tapinauchenius Ausserer, 1871
- Genus Tekoapora Galleti-Lima, Hamilton, Borges & Guadanucci, 2023
- Genus Theraphosa Walckenaer, 1805
- Genus Thrigmopoeus Pocock, 1899
- Genus Thrixopelma Schmidt, 1994
- Genus Tliltocatl Mendoza & Francke, 2020
- Genus Tmesiphantes Simon, 1892
- Genus Trasyphoberus Simon, 1903 accepted as Acanthoscurria Ausserer, 1871
- Genus Trichognatha Gallon, 2002
- Genus Trichognathella Gallon, 2004
- Genus Trichopelma Simon, 1888
- Genus Typhochlaena Koch, 1850
- Genus Umangia Strand, 1920 accepted as Phoneyusa Karsch, 1884
- Genus Umbyquyra Gargiulo, Brescovit & Lucas, 2018
- Genus Urupelma Kaderka, Lüddecke, Řezáč, Řezáčová & Hüsser, 2023
- Genus Vitalius Lucas, da Silva & Bertani, 1993
- Genus Weyenberghia Mello-Leitão, 1941 accepted as Aphonopelma Pocock, 1901
- Genus Weyenberghiana Mello-Leitão, 1941 accepted as Aphonopelma Pocock, 1901
- Genus Xenesthis Simon, 1892
- Genus Xenodendrophila Gallon, 2003
- Genus Yamia Kishida, 1920
- Genus Yanomamius Bertani & Almeida, 2021
- Genus Ybyrapora Fukushima & Bertani, 2017
- Genus Zophopelma Benoit, 1965 accepted as Euphrictus Hirst, 1908
- Family Theridiidae Sundevall, 1833
- 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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