Between brackets is the number of accepted species
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2 Shows the number of accepted species within the taxon
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- Biota
- Kingdom Animalia
- Phylum Acanthocephala
- Phylum Agmata †
- Phylum Animalia (awaiting allocation)
- Phylum Animalia incertae sedis
- Phylum Annelida
- Phylum Arthropoda
- Subphylum Chelicerata
- Class Arachnida
- Order Acari (awaiting allocation)
- Order Acariformes (awaiting allocation)
- Order Actinedida
- Order Amblypygi
- Order Arachnida (awaiting allocation)
- Order Arachnida incertae sedis
- Order Araneae
- Order Architarbida †
- Order Astigmata
- Order Haptopodida †
- Order Holothyrida
- Order Ixodida
- Order Mesostigmata
- 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
- Family Acanthoscopioniidae † accepted as Acanthoscorpionidae Kjellesvig-Waering, 1986 †
- Family Acanthoscorpionidae Kjellesvig-Waering, 1986 †
- Family Akravidae Levy, 2007
- Family Allobuthiscorpiidae Kjellesvig-Waering, 1986 †
- Family Allopalaeophonidae Kjellesvig-Waering, 1986 †
- Family Ananteridae Pocock, 1900
- Family Anthracochaerilidae Kjellesvig-Waering, 1986 † accepted as Centromachidae Petrunkevitch, 1953 †
- Family Anthracoscorpionidae Fritsch, 1904 †
- Family Anuroctonidae Santibáñez-López, Ojanguren-Affilastro, Graham & Sharma, 2023
- Family Archaeobuthidae Lourenço, 2001 †
- Family Archaeoctonidae Petrunkevitch, 1949 † accepted as Proscorpiidae Scudder, 1885 †
- Family Belisariidae Lourenço, 1998
- Family Bothriuridae Simon, 1880
- Family Branchioscorpionidae Kjellesvig-Waering, 1986 †
- Family Buthidae Koch, 1837
- Family Buthiscorpiidae Kjellesvig-Waering, 1986 †
- Family Caraboctonidae Kraepelin, 1905
- Family Centromachidae Petrunkevitch, 1953 †
- Family Chactidae Pocock, 1893
- Family Chaerilidae Pocock, 1893
- Family Chaerilobuthidae Lourenço & Beigel, 2011 †
- Family Cyclophthalmidae Thorell & Lindström, 1885 †
- Family Diplocentridae Karsch, 1880
- Family Dolichophonidae Petrunkevitch, 1953 †
- Family Eobuthidae Kjellesvig-Waering, 1986 †
- Family Eoctonidae Kjellesvig-Waering, 1986 †
- Family Eoscorpiidae Scudder, 1884 †
- Family Euscorpiidae Laurie, 1896
- Family Gallioscorpionidae Lourenço & Gall, 2004 †
- Family Garnettiidae Dubinin, 1962 †
- Family Gigantoscorpionidae Kjellesvig-Waering, 1986 †
- Family Heloscorpionidae Kjellesvig-Waering, 1986 †
- Family Hemiscorpiidae Pocock, 1893
- Family Heteroscorpionidae Kraepelin, 1905
- Family Holosterina incertae sedis
- Family Hormuridae Laurie, 1896
- Family Hydroscorpiidae Kjellesvig-Waering, 1986 † accepted as Proscorpiidae Scudder, 1885 †
- Family Ischnuridae Simon, 1879 accepted as Hormuridae Laurie, 1896
- Family Isobuthidae Petrunkevitch, 1913 †
- Family Iuridae Thorell, 1876
- Family Kronoscorpionidae Kjellesvig-Waering, 1986 †
- Family Labriscorpionidae Kjellesvig-Waering, 1986 † accepted as Proscorpiidae Scudder, 1885 †
- Family Liassoscorpionididae Kjellesvig-Waering, 1986 †
- Family Liochelidae Fet & Bechley, 2001 accepted as Hormuridae Laurie, 1896
- Family Loboarchaeoctonidae Kjellesvig-Waering, 1986 †
- Family Mazoniidae Petrunkevitch, 1913 †
- Family Mesophonidae Wills, 1910 †
- Family Microcharmidae Lourenço, 1996 accepted as Buthidae Koch, 1837
- Family Microlabiidae Kjellesvig-Waering, 1986 †
- Family Opsieobuthidae Kjellesvig-Waering, 1986 † accepted as Centromachidae Petrunkevitch, 1953 †
- Family Orthosterni incertae sedis
- Family Palaeoburmesebuthidae Lourenço, 2015 †
- Family Palaeobuthidae Kjellesvig-Waering, 1986 †
- Family Palaeobuthoidea incertae sedis
- Family Palaeoeuscorpiidae Lourenço, 2003 †
- Family Palaeophonidae Thorell & Lindström, 1885 †
- Family Palaeopisthacanthidae Kjellesvig-Waering, 1986 †
- Family Palaeoscorpiidae Lehmann, 1944 †
- Family Palaeotrilineatidae Lourenço, 2012 †
- Family Pandinidae Thorell, 1876 accepted as Scorpionidae Leach, 1815
- Family Paraisobuthidae Kjellesvig-Waering, 1986 †
- Family Pareobuthidae Kjellesvig-Waering, 1986 †
- Family Petaloscorpionidae Kjellesvig-Waering, 1986 † accepted as Gigantoscorpionidae Kjellesvig-Waering, 1986 †
- Family Phoxiscorpionidae Kjellesvig-Waering, 1986 † accepted as Centromachidae Petrunkevitch, 1953 †
- Family Praearcturidae Kjellesvig-Waering, 1986 †
- Family Proscorpiidae Scudder, 1885 †
- Family Protobuthidae Lourenço & Gall, 2004 †
- Family Protochactidae Lourenço, Magnani & Stockar, 2022 †
- Family Protoischnuridae Carvalho & Lourenço, 2001 †
- Family Pseudobuthiscorpiidae Kjellesvig-Waering, 1986 †
- Family Pseudochactidae Gromov, 1998
- Family Rugodentidae Bastawade, Sureshan & Radhakrishnan, 2005
- Family Scoloposcorpionidae Kjellesvig-Waering, 1986 †
- Family Scorpiones (awaiting allocation)
- Family Scorpiones incertae sedis
- Family Scorpionidae Leach, 1815
- Family Scorpiopidae Kraepelin, 1905
- Genus Alloscorpiops Vachon, 1980 accepted as Scorpiops Peters, 1861
- Genus Dasyscorpiops Vachon, 1974 accepted as Scorpiops Peters, 1861
- Genus Euscorpiops Vachon, 1980
- Genus Laoscorpiops Lourenço, 2013 accepted as Alloscorpiops Vachon, 1980
- Genus Neoscorpiops Vachon, 1980 accepted as Scorpiops Peters, 1861
- Species Neoscorpiops deccanensis (Tikader & Bastawade, 1977)
- Species Neoscorpiops satarensis (Pocock, 1900)
- Species Neoscorpiops tenuicauda (Pocock, 1894)
- Genus Parascorpiops Banks, 1928
- Genus Pareuscorpius Vachon in Lindberg, 1961 accepted as Scorpiops Peters, 1861
- Genus Plethoscorpiops Lourenço, 2017 accepted as Scorpiops Peters, 1861
- Genus Scorpiops Peters, 1861
- Genus Vietscorpiops Lourenço & Pham, 2015 accepted as Scorpiops Peters, 1861
- Family Scorpiopsidae accepted as Euscorpiidae Laurie, 1896
- Family Spongiophonidae Kjellesvig-Waering, 1986 †
- Family Stenoscorpionidae Kjellesvig-Waering, 1986 †
- Family Stoermeroscorpionidae Kjellesvig-Waering, 1986 † accepted as Proscorpiidae Scudder, 1885 †
- Family Sucinlourencoidae Rossi, 2015 †
- Family Superstitionidae accepted as Superstitioniidae Stahnke, 1940
- Family Superstitioniidae Stahnke, 1940
- Family Telmatoscorpionidae Kjellesvig-Waering, 1986 †
- Family Tiphoscorpionidae †
- Family Troglotayosicidae Lourenço, 1998
- Family Typhlochactidae Mitchell, 1971
- Family Urodacidae Pocock, 1893
- Family Vaejovidae Thorell, 1876
- Family Waeringoscorpionidae Størmer, 1970 † accepted as Proscorpiidae Scudder, 1885 †
- Family Waterstoniidae Kjellesvig-Waering, 1986 †
- Family Willsiscorpionidae Kjellesvig-Waering, 1986 †
- 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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