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
- Genus Adrastidia Simon, 1900 accepted as Pedinopistha Karsch, 1880
- Genus Apollophanes O. Pickard-Cambridge, 1898
- Genus Artama Simon, 1864
- Genus Artamus Koch, 1837
- Genus Artanes Thorell, 1869
- Genus Bacillocnemis Mello-Leitão, 1938 accepted as Petrichus Simon, 1886
- Genus Balticodromus Wunderlich, 2022 †
- Genus Berlandiella Mello-Leitão, 1929 accepted as Cleocnemis Simon, 1886
- Species Berlandiella insignis Mello-Leitao, 1929
- Species Berlandiella magna Mello-Leitao, 1929
- Species Berlandiella polyacantha Mello-Leitao, 1929
- Genus Catuna Mello-Leitão, 1940
- Genus Celerrimus Lecigne, Cornic, Oger & Van Keer, 2019
- Genus Cleocnemis Simon, 1886
- Genus Cretadromus Cheng, Shen & Gao, 2009 †
- Genus Ebo Keyserling, 1884
- Genus Emargidromus Wunderlich, 2012
- Genus Eminella Özdikmen, 2007
- Genus Eothanatus Petrunkevitch, 1950 †
- Genus Fageia Mello-Leitão, 1929
- Genus Filiola Petrunkevitch, 1942 † accepted as Filiolella Petrunkevitch, 1955 †
- Genus Filiolella Petrunkevitch, 1955 †
- Genus Gephyra Koch in Koch (Keyserling), 1873 accepted as Gephyrota Strand, 1932
- Genus Gephyrella Mello-Leitão, 1918 accepted as Gephyrellula Strand, 1932
- Genus Gephyrellula Strand, 1932
- Genus Gephyrina Simon, 1895
- Genus Gephyrota Strand, 1932
- Genus Halodromus Muster, 2009
- Genus Hirrius Simon, 1895 accepted as Hirriusa Strand, 1932
- Genus Hirriusa Strand, 1932
- Genus Horodromoides Gertsch, 1933 accepted as Philodromus Walckenaer, 1824
- Genus Horodromus Chamberlin, 1924 accepted as Apollophanes O. Pickard-Cambridge, 1898
- Genus Locupletus Schick, 1965 accepted as Rhysodromus Schick, 1965
- Genus Medela Petrunkevitch, 1942 †
- Genus Metacleocnemis Mello-Leitão, 1929 accepted as Cleocnemis Simon, 1886
- Genus Opitis Koch, 1875
- Genus Pagiopalus Simon, 1900
- Genus Paracleocnemis Schiapelli & Gerschman, 1942
- Genus Paratibelloides Jézéquel, 1964 accepted as Thanatus Koch, 1837
- Genus Paratibellus Simon, 1932
- Genus Pedinopistha Karsch, 1880
- Genus Pelloctanes Schick, 1965 accepted as Apollophanes O. Pickard-Cambridge, 1898
- Genus Petrichus Simon, 1886
- Genus Petricus Petrunkevitch, 1928 accepted as Petrichus Simon, 1886
- Genus Philodroma Berthold in Latreille, 1827 accepted as Philodromus Walckenaer, 1824
- Genus Philodromimus Wunderlich, 2012
- Genus Philodromoides Scheffer, 1904 accepted as Philodromus Walckenaer, 1824
- Genus Philodromops Mello-Leitão, 1943
- Genus Philodromus Walckenaer, 1824
- Genus Procleocnemis Mello-Leitão, 1929
- Genus Proernus Simon, 1900 accepted as Pedinopistha Karsch, 1880
- Genus Psellonus Simon, 1897
- Genus Pseudopsellonus Balogh, 1936
- Genus Pterelas Simon, 1899
- Genus Pulchellodromus Wunderlich, 2012
- Genus Quemedice Mello-Leitão, 1942
- Genus Rhysodromus Schick, 1965 accepted as Philodromus Walckenaer, 1824
- Genus Senoculifer Balogh, 1936
- Genus Sinodromus Yao & Liu, 2024
- Genus Suemus Simon, 1895
- Genus Thanata Simon, 1864 accepted as Thanatus Koch, 1837
- Genus Thanatus Koch, 1837
- Genus Tibellinus Simon, 1910 accepted as Tibellus Simon, 1875
- Genus Tibelloides Mello-Leitão, 1939 accepted as Tibellus Simon, 1875
- Genus Tibellus Simon, 1875
- Genus Tibinatus Petrunkevitch, 1928 accepted as Tibitanus Simon, 1907
- Genus Tibitanus Simon, 1907
- Genus Titanebo Gertsch, 1933 accepted as Ebo Keyserling, 1884
- Genus Vacchellia Caporiacco, 1935
- 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
- 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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