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
- Subphylum Crustacea
- Class Branchiopoda
- Class Cephalocarida
- Class Crustacea (awaiting allocation)
- Class Crustacea incertae sedis
- Class Ichthyostraca
- Class Malacostraca
- Order Aeschronectida †
- Order Amphionidacea
- Order Amphipoda
- Order Anaspidacea
- Order Angustidontida †
- Order Archaeostraca †
- Order Asellota (awaiting allocation)
- Order Bathynellacea
- Order Belotelsonidea †
- Order Cumacea
- Order Decapoda
- Order Eocaridacea †
- Order Eumalacostraca (awaiting allocation)
- Order Euphausiacea
- Order Hoplostraca
- Order Hymenostraca †
- Order Isopoda
- Family Acanthaspidiidae Menzies, 1962
- Family Actaeciidae Vandel, 1964
- Family Aegidae White, 1850
- Family Agnaridae Schmidt, 2003
- Family Alloniscidae Schmidt, 2003
- Family Amesopodidae Stebbing, 1905 accepted as Arcturidae Dana, 1849
- Family Amphisopidae Nicholls, 1943
- Family Amphisopodidae
- Family Ancinidae Dana, 1852
- Family Antarcturidae Poore, 2001
- Family Antheluridae Poore & Lew Ton, 1988
- Family Anthuridae Leach, 1814
- Family Anuropidae Stebbing, 1893
- Family Archaeoniscidae von Ammon, 1882 †
- Family Archeoniscidae †
- Family Arcturidae Dana, 1849
- Family Arcturididae Poore, 2001
- Family Armadillidae Brandt, 1833
- Family Armadillididae accepted as Armadillidiidae Brandt, 1833
- Family Armadillidiidae Brandt, 1833
- Family Asconiscidae Bonnier, 1900
- Family Asellidae Rafinesque, 1815
- Family Astacillidae Stebbing, 1905 accepted as Arcturidae Dana, 1849
- Family Atlantasellidae Sket, 1979
- Family Atlantidiidae
- Family Austrarcturellidae Poore & Bardsley, 1992
- Family Balloniscidae Vandel, 1963
- Family Barybrotidae Hansen, 1890
- Family Basoniscidae Wilson, 2024
- Family Basserolidae Brandt & Poore, 2003
- Family Bathynataliidae Kensley, 1978
- Family Bathytropidae Vandel, 1952
- Family Berytoniscidae Vandel, 1955
- Family Bopyridae Rafinesque, 1815
- Family Brasileirinidae Pervorcnik, Ferreira & Sket, 2012
- Family Buddelundiellidae Verhoeff, 1930
- Family Cabiropidae Giard & Bonnier, 1887
- Family Cabiropsidae Giard & Bonnier, 1887 accepted as Cabiropidae Giard & Bonnier, 1887
- Family Calabozoidae Van Lieshout, 1983
- Family Capitoniscidae Boyko & Williams, 2023
- Family Chaetiliidae Dana, 1849
- Family Cirolanidae Dana, 1852
- Family Colypuridae Richardson, 1905
- Family Corallanidae Hansen, 1890
- Family Crinoniscidae Bonnier, 1900
- Family Cryptoniscidae Kossmann, 1880
- Family Cryptoniscoidea incertae sedis
- Family Cryptothiridae Sars, 1883
- Family Cumoechidae Boyko & Williams, 2023
- Family Cylisticidae Verhoeff, 1949
- Family Cymothoida incertae sedis †
- Family Cymothoidae Leach, 1818
- Genus Aegathoa Dana, 1853
- Genus Agarna Schioedte & Meinert, 1884
- Genus Amblycephalon Pillai, 1954
- Genus Anilacra Leach, 1818 accepted as Anilocra Leach, 1818
- Genus Anilocra Leach, 1818
- Genus Anphira Thatcher, 1993
- Genus Artystone Schioedte, 1866
- Genus Asotana Schioedte & Meinert, 1881
- Genus Badroulboudor accepted as Asotana Schioedte & Meinert, 1881
- Genus Braga Schioedte & Meinert, 1881
- Genus Brucethoa Aneesh, Hadfield, Smit & Kumar, 2020
- Genus Calverteca Godfrey, Feldmann & Schweitzer, 2024 †
- Genus Canolira Leach, 1818 accepted as Anilocra Leach, 1818
- Genus Catoessa Schioedte & Meinert, 1884
- Genus Ceratothoa Dana, 1852
- Genus Cinusa Schioedte & Meinert, 1884
- Genus Codonophilus Haswell, 1881 accepted as Ceratothoa Dana, 1852
- Genus Colombia Rang, 1835 accepted as Anilocra Leach, 1818
- Genus Creniola Bruce, 1987
- Genus Cteatessa Schioedte & Meinert, 1883 accepted as Ceratothoa Dana, 1852
- Genus Cterissa Schioedte & Meinert, 1884
- Genus Cuna Williams & Williams, 1985 accepted as Kuna Williams & Williams, 1986
- Genus Cymatoga von Eichwald, 1863 †
- Genus Cymothoa Fabricius, 1793
- Genus Cymothoe Rafinesque, 1814 accepted as Cymothoa Fabricius, 1793
- Genus Elthusa Schioedte & Meinert, 1884
- Genus Emetha Schioedte & Meinert, 1883
- Genus Enispa Schioedte & Meinert, 1884 accepted as Smenispa Özdikmen, 2009
- Genus Epichthys Herklots, 1870 accepted as Anilocra Leach, 1818
- Genus Glossobius Schiödte & Meinert, 1883
- Genus Ichthyophila Erichson, 1840
- Genus Ichthyophilus Berthold in Latreille, 1827 accepted as Nerocila Leach, 1818
- Genus Ichthyoxenos Herklots, 1870
- Genus Ichthyoxenus Zimmer in Krumbach & Kükenthal, 1927 accepted as Ichthyoxenus auctt.
- Genus Ichthyoxenus auctt. accepted as Ichthyoxenos Herklots, 1870
- Species Ichthyoxenus africana (Lincoln, 1972)
- Species Ichthyoxenus amurensis (Gerstfeldt, 1858)
- Species Ichthyoxenus asymmetrica Ahmed, 1970
- Species Ichthyoxenus circularius Shen, 1940
- Species Ichthyoxenus dentimaxillus Shen, 1940
- Species Ichthyoxenus expansus Van Name, 1920
- Species Ichthyoxenus formosanus Harada, 1930
- Species Ichthyoxenus fushanensis Tsai & Dai, 1999
- Species Ichthyoxenus geei Boone, 1921
- Species Ichthyoxenus hsiakowensis Yu, 1935
- Species Ichthyoxenus japonensis Richardson, 1913
- Species Ichthyoxenus jellinghausii Herklots, 1870
- Species Ichthyoxenus longenditus Shen, 1940
- Species Ichthyoxenus micronyx (Miers, 1880)
- Species Ichthyoxenus minabensis (Shiino, 1951)
- Species Ichthyoxenus montanus Schioedte & Meinert, 1884
- Species Ichthyoxenus opisthopterygium Ishii, 1916
- Species Ichthyoxenus puhi (Bowman, 1962)
- Species Ichthyoxenus quadratus Shen, 1940
- Species Ichthyoxenus sinensis Shen, 1940
- Species Ichthyoxenus tanganyikae (Fryer, 1965)
- Species Ichthyoxenus tchangi Yu, 1935
- Species Ichthyoxenus yunnanensis Yu, 1935
- Genus Idusa Schiödte & Meinert, 1884
- Genus Indusa Richardson, 1905 accepted as Ichthyoxenus auctt.
- Genus Irona Schiödte & Meinert, 1884 accepted as Mothocya Costa in Hope, 1851
- Genus Isonebula Taberner, 1977
- Genus Joryma Bowman & Tareen, 1983
- Genus Kuna Williams & Williams, 1986
- Genus Lathraena Schioedte & Meinert, 1881
- Genus Lironeca White, 1847 accepted as Livoneca Leach, 1818
- Genus Livoneca Leach, 1818
- Genus Livonectus Airoldi, 1940 accepted as Livoneca Leach, 1818
- Genus Lobothorax Bleeker, 1857
- Genus Meinertia Stebbing, 1893 accepted as Ceratothoa Dana, 1852
- Genus Mothocya Costa in Hope, 1851
- Genus Nebula Taberner, 1977 † accepted as Isonebula Taberner, 1977
- Genus Nerocila Leach, 1818
- Genus Norileca Bruce, 1990
- Genus Olencira Leach, 1818
- Genus Orozeuktes Dana, 1852 accepted as Ourozeuktes H. Milne Edwards, 1840
- Genus Ourozeuctes Agassiz, 1846
- Genus Ourozeuktes H. Milne Edwards, 1840
- Genus Ourozeukthes H. Milne Edwards, 1840
- Genus Paracymothoa Lemos de Castro, 1955
- Genus Parvucymoides Van der Wal, Schädel, Ekrt & Haug, 2021 †
- Genus Philostomella Szidat & Schubart, 1960
- Genus Pleopodias Richardson, 1910
- Genus Plotor Schioedte & Meinert, 1881
- Genus Pseudoirona Pillai, 1964
- Genus Renocila Miers, 1880
- Genus Rhexana Schiödte & Meinert, 1883 accepted as Ceratothoa Dana, 1852
- Genus Rhexanella Stebbing, 1911
- Genus Rhiothra Schioedte & Meinert, 1884
- Genus Riggia Szidat, 1948
- Genus Rosca Schioedte & Meinert, 1881 accepted as Renocila Miers, 1880
- Genus Ryukyua Williams & Bunkley-Williams, 1994
- Genus Saophra Schiödte & Meinert, 1883 accepted as Lobothorax Bleeker, 1857
- Genus Smenispa Özdikmen, 2009
- Genus Telethoa
- Genus Telotha Schioedte & Meinert, 1884
- Genus Tetragonocephalon Avdeev, 1978
- Genus Urozeuctes van der Hoeven, 1849
- Genus Urozeuctus Agassiz, 1846
- Genus Urozeuktes accepted as Ourozeuktes H. Milne Edwards, 1840
- Genus Vanamea Thatcher, 1993
- Family Cyproniscidae Giard & Bonnier, 1887
- Family Dajidae Giard & Bonnier, 1887
- Family Delatorreiidae Verhoeff, 1938
- Family Dendrotiidae accepted as Dendrotionidae Vanhöffen, 1914
- Family Dendrotionidae Vanhöffen, 1914
- Family Desmosomatidae G. O. Sars, 1897
- Family Detonidae Budde-Lund, 1906
- Family Dubioniscidae Schultz, 1995
- Family Echinothambematidae Menzies, 1956
- Family Entoniscidae Kossmann, 1881
- Family Entophilidae Richardson, 1903
- Family Eubelidae Budde-Lund, 1899
- Family Eurycopidae Hansen, 1916 accepted as Munnopsidae Lilljeborg, 1864
- Family Expanathuridae Poore, 2001
- Family Fabidae Danforth, 1963 accepted as Cryptoniscidae Kossmann, 1880
- Family Gnathiidae Leach, 1814
- Family Gnathostenetroidae Fresi, Idato & Scipione, 1980 accepted as Gnathostenetroididae Kussakin, 1967
- Family Gnathostenetroididae Kussakin, 1967
- Family Hadromastacidae Bruce & Mueller, 1991
- Family Halophilosciidae Verhoeff, 1908
- Family Haplomunnidae Wilson, 1976
- Family Haploniscidae Hansen, 1916
- Family Hekelidae Ferrara, 1977
- Family Helelidae
- Family Hemioniscidae Bonnier, 1900
- Family Holidoteidae Wägele, 1989
- Family Holognathidae Thomson, 1904
- Family Hypsimetopidae Nicholls, 1943
- Family Hypsimetopodidae
- Family Hyssuridae Wägele, 1981
- Family Idoteidae Samouelle, 1819
- Family Idotheidae accepted as Idoteidae Samouelle, 1819
- Family Ilyarachnidae Hansen, 1916 accepted as Munnopsidae Lilljeborg, 1864
- Family Ionidae H. Milne Edwards, 1840
- Family Irmaosidae Ferrara & Taiti, 1983
- Family Ischnomesidae Hansen, 1916
- Family Isopoda (awaiting allocation)
- Family Isopoda incertae sedis
- Family Jaeridae Sars, 1897 accepted as Janiridae Sars, 1897
- Family Jaeropsidae accepted as Joeropsididae Nordenstam, 1933
- Family Janirellidae Menzies, 1956
- Family Janiridae Sars, 1897
- Family Janiroidea incertae sedis
- Family Joeropsidae Nordenstam, 1933 accepted as Joeropsididae Nordenstam, 1933
- Family Joeropsididae Nordenstam, 1933
- Family Katianiridae Svavarsson, 1987
- Family Keuphyliidae Bruce, 1980
- Family Lantoceramiidae Wilson & Morel, 2022 †
- Family Lepidocharontidae Galassi & Bruce in Galassi et al., 2016
- Family Leptanthuridae Poore, 2001
- Family Ligiidae Leach, 1814
- Family Limnoriidae White, 1850
- Family Liriopsidae Bonnier, 1900 accepted as Cryptoniscidae Kossmann, 1880
- Family Macrostylidae Hansen, 1916
- Family Mesamphisopidae Nicholls, 1943
- Family Mesamphisopodidae accepted as Amphisopodidae
- Family Mesoniscidae
- Family Mesosignidae Schultz, 1969
- Family Microcerberidae Karaman, 1933
- Family Microniscidae Giard & Bonnier, 1887 accepted as
- Family Microparasellidae Karaman, 1933
- Family Mictosomatidae Wolff, 1965
- Family Munnidae Sars, 1897
- Family Munnopsidae Lilljeborg, 1864
- Family Munnopsididae accepted as Munnopsidae Lilljeborg, 1864
- Family Nannoniscidae Hansen, 1916
- Family Nichollsiidae accepted as Hypsimetopodidae
- Family Olibrinidae Budde-Lund, 1913
- Family Oniscidae Latreille, 1806
- Family Oniscidea incertae sedis
- Family Palaeophreatoicidae Birshtein, 1962 †
- Family Paramunnidae Vanhöffen, 1914
- Family Paranthuridae Menzies & Glynn, 1968
- Family Paraplatyarthridae Javidkar & King in Javidkar et al., 2015
- Family Parasellidae
- Family Periscyphicidae
- Family Philosciidae Kinahan, 1857
- Family Phoratopodidae Hale, 1925
- Family Phreatoicidae Chilton, 1891
- Family Phreatoicidea incertae sedis
- Family Phreatoicopsidae Nicholls, 1943
- Family Phreatoicopsididae
- Family Plakarthriidae Hansen, 1905
- Family Plakathriidae accepted as Plakarthriidae Hansen, 1905
- Family Platyarthridae Verhoeff, 1949
- Family Pleurocopidae Fresi & Schiecke, 1972
- Family Pleurogoniidae Nordenstam, 1933 accepted as Paramunnidae Vanhöffen, 1914
- Family Podasconidae Giard & Bonnier, 1895
- Family Ponderellidae Wilson & Keable, 2004
- Family Porcellionidae Brandt & Ratzeburg, 1831
- Family Proteolepidae accepted as Crinoniscidae Bonnier, 1900
- Family Protognathiidae Wägele & Brandt, 1988
- Family Protojaniridae Fresi, Idato & Scipione, 1980
- Family Pseudarmadillidae
- Family Pseudidotheidae Ohlin, 1901
- Family Pseudojaniridae Wilson, 1986
- Family Pseudomesidae Hansen, 1916 accepted as Desmosomatidae G. O. Sars, 1897
- Family Pudeoniscidae Lemos de Castro, 1973
- Family Rectarcturidae Poore, 2001
- Family Rhabdochiridae Richardson, 1905
- Family Rhyscotidae Budde-Lund, 1904
- Family Santiidae Wilson, 1987
- Family Schistosomatidae Poche, 1907 accepted as Mictosomatidae Wolff, 1965
- Family Schoebliidae Verhoeff, 1938
- Family Scleropactidae Verhoeff, 1938
- Family Scutocoxifera (awaiting allocation)
- Family Scutocoxifera incertae sedis †
- Family Scyphacidae Dana, 1852
- Family Serolidae Dana, 1852
- Family Spelaeoniscidae Vandel, 1948
- Family Sphaeromatidae Latreille, 1825
- Family Sphaeromatoidea incertae sedis
- Family Sphaeroniscidae
- Family Stellatoniscidae Oanh & Boyko, 2020
- Family Stenasellidae Dudich, 1924
- Family Stenetriidae Hansen, 1905
- Family Stenoniscidae Budde-Lund, 1904
- Family Styloniscidae Vandel, 1952
- Family Tainisopidae Wilson, 2003
- Family Tecticepitidae
- Family Tecticipitidae Iverson, 1982
- Family Tendosphaeridae Verhoeff, 1930
- Family Thambematidae Stebbing, 1913
- Family Thermoarcturidae Poore, 2015
- Family Titanidae Verhoeff, 1938
- Family Trachelipodidae Strouhal, 1953
- Family Trichoniscidae Sars, 1899
- Family Tridentellidae Bruce, 1984
- Family Turanoniscidae Borutzkii, 1969B
- Family Tylidae Dana, 1852
- Family Urdidae Kunth, 1870 †
- Family Urstylidae Riehl, Wilson & Malyutina, 2014
- Family Vermectiadidae Just & Poore, 1992
- Family Xenarcturidae Sheppard, 1957
- Family Xenosellidae Just, 2005
- Genus Eobooralana Schädel, Nagler & Hyžný, 2023 †
- Order Leptostraca
- Order Lophogastrida
- Order Malacostraca (awaiting allocation)
- Order Mictacea
- Order Mysida
- Order Palaeocaridacea †
- Order Palaeostomatopoda †
- Order Phyllocarida (awaiting allocation)
- Order Phyllocarida incertae sedis †
- Order Pygocephalomorpha †
- Order Spelaeogriphacea
- Order Stomatopoda
- Order Syncarida incertae sedis †
- Order Tanaidacea
- Order Thermosbaenacea
- Order Waterstonellidea
- Family Essoidiidae Schram, 1974 †
- Genus Hohensteiniella Haug, Poschmann, Hörnig & Lutz, 2016 †
- Genus Mesoprosopon Stolley, 1914 †
- Class Maxillopoda
- Class Ostracoda
- Class Remipedia
- Order Cyclida †
- Genus Anatifera Meuschen, 1787
- Genus Dickinsonia Tasch, 1963 † accepted as Elmocephalus Tasch, 1964 †
- Genus Elmocephalus Tasch, 1964 †
- 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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