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
- Class Maxillopoda
- Class Ostracoda
- Order Archaeocopida
- Order Bradoriida †
- Order Cytheroidea (awaiting allocation)
- Order Eridostracoda
- Order Halocyprida
- Order Leiocopa
- Order Leperditicopida †
- Order Metacopida
- Order Myodocopida
- Order Ostracoda (awaiting allocation)
- Order Ostracoda incertae sedis
- Order Palaeocopida
- Order Phosphatocopida †
- Order Platycopida
- Order Podocopida
- Family Acratiidae Gruendel, 1962 †
- Family Acronotellidae Swartz, 1936 †
- Family Alloiocyprideidae Ayress & Whatley, 2014 †
- Family Australocytherideidae Hartmann, 1980
- Family Bairdiidae Sars, 1865
- Family Bairdiocopina incertae sedis
- Family Bairdiocyprididae Shaver, 1961 †
- Family Beecherellidae Ulrich, 1894 †
- Family Berounellidae Sohn & Berdan, 1960 †
- Family Bonaducecytheridae McKenzie, 1977
- Family Brachycytheridae Puri, 1954 accepted as Trachyleberididae Sylvester-Bradley, 1948
- Family Bufinidae Sohn & Stover, 1961 †
- Family Bythocyprididae Maddocks, 1969
- Family Bythocytheridae Sars, 1866
- Family Candonidae Kaufmann, 1900
- Family Candoniidae accepted as Candonidae Kaufmann, 1900
- Family Carbonitidae Swain, 1976 †
- Family Cavellinidae Egorov, 1950 †
- Family Cobanocytheridae Schornikov, 1975
- Family Collisarborisidae Neale, 1975 †
- Family Cuneocytheridae
- Family Cushmanideidae Puri, 1974
- Family Cyclocypridae
- Family Cypridae accepted as Cyprididae Baird, 1845
- Family Cyprideaidae Martin, 1940 †
- Family Cyprideidae Martin, 1940 †
- Family Cyprididae Baird, 1845
- Genus Acocypris Vávra, 1894
- Genus Afrocypris Sars, 1924
- Genus Alboa De Deckker, 1981
- Genus Altanicypris Szczechura, 1978 †
- Genus Amphibolocypris Rome, 1965
- Genus Amphicypris Sars, 1901
- Genus Ampullacypris de Deckker, 1981
- Genus Apatelecypris Rome, 1965
- Genus Arctocypris Petkovski, Scharf & Keyser, 2016
- Genus Argentocypris Díaz & Martens, 2014
- Genus Astenocypris G.W. Müller, 1912
- Genus Australocypris De Dekker, 1974
- Genus Austrocypridopsis McKenzie, 1982
- Genus Austromesocypris Martens, De Deckker & Rossetti, 2004
- Genus Batecypris Almeida-Lima, Guzmán, Maia, Jesus & Piovesan, 2024 †
- Genus Batucypretta Victor & Fernando, 1981
- Genus Bennelongia De Deckker & McKenzie, 1981
- Genus Billcypris Halse & Martens, 2019
- Genus Bilocypris Halse & Martens, 2019
- Genus Bradleycypris McKenzie, 1982
- Genus Bradleystrandesia Broodbakker, 1983
- Genus Bradleytriebella Savatenalinton & Martens, 2009
- Genus Bradycypris Sars, 1925
- Genus Brasilodopsis Almeida, Higuti, Ferreira & Martens, 2021
- Genus Bronsteinella Krstić & Keyser, 2008 †
- Genus Bryocypris Røen, 1956
- Genus Cabelodopsis Higuti & Martens, 2012
- Genus Caboncypris de Deckker, 1982
- Genus Caledromus Martens, Góis Ferreira, Martins de Almeida & Higuti, 2023
- Genus Callistocypris Schornikov, 1980
- Genus Candocypria Furtos, 1933
- Genus Candonocypris Sars, 1894
- Genus Cavernocypris Hartmann, 1964
- Genus Chlamidotheca Kotzian, 1974 accepted as Chlamydotheca Saussure, 1858
- Genus Chlamydotheca Saussure, 1858
- Genus Chrissia Hartmann, 1957
- Genus Cyclocypria
- Genus Cyclocypris Brady & Norman, 1889
- Genus Cypretta Vávra, 1895
- Genus Cyprettadopsis Savatenalinton, 2020
- Genus Cypria Zenker, 1854
- Genus Cypricercus G.O. Sars, 1895
- Genus Cypriconcha Sars, 1926
- Genus Cypridonotus Claus, 1892 accepted as Cyprinotus Brady, 1886
- Genus Cypridopsis Brady, 1867
- Genus Cyprinotis
- Genus Cyprinotus Brady, 1886
- Genus Cypris O.F. Müller, 1776
- Genus Cyprisia Rafinesque, 1815 † accepted as Cypris O.F. Müller, 1776
- Genus Cyprois Zenker, 1854
- Genus Darwinea Bate, 1856
- Genus Darwinia Bate, 1857
- Genus Diacypris Herbst, 1961 accepted as Pseudocypris Daday, 1910
- Genus Diaphanocypris Würdig & Pinto, 1990
- Genus Dolerocypris Kaufmann, 1900
- Genus Erpetocypris Brady & Norman, 1889 accepted as Herpetocypris Brady & Norman, 1889
- Genus Eucyprinotus Sywula, 1972
- Genus Eucypris Vávra, 1891
- Genus Eundacypris Martens, 1986
- Genus Eurycypris Müller, 1898
- Genus Gesa Hartmann, 1957 accepted as Chrissia Hartmann, 1957
- Genus Globocypris Klie, 1939
- Genus Globotalicypridea Cabral & Colin, 2008 †
- Genus Guaiqueria Margalef, 1961 accepted as Eucypris Vávra, 1891
- Genus Harbinia Tsao, 1959 †
- Genus Hemicypris Sars, 1903
- Genus Herpetocyprella Daday, 1909
- Genus Herpetocypris Brady & Norman, 1889
- Genus Herpetocypris Sars, 1890 accepted as Herpetocypris Brady & Norman, 1889
- Genus Heterocypris Claus, 1893
- Genus Homocypris Sars, 1924
- Genus Humphcypris Martens, 1997
- Genus Hyalocypris Brady, 1913 accepted as Isocypris Müller, 1908
- Genus Hypselecypris Rome, 1964
- Genus Ilyocypris Brady & Norman, 1889
- Genus Ilyodromus Sars, 1894
- Genus Isocypris Müller, 1908
- Genus Kapcypridopsis McKenzie, 1977
- Genus Kapcypriodopsis
- Genus Klieopsis Martens, Meisch & Marmonier, 1991
- Genus Koencypris Meish, 2000
- Genus Kroemmelbeincypris Poropat & Colin, 2012 †
- Genus Kunlunia Jiang & Lin in Jiang, Zhou, Lin et al., 1995 † accepted as Kunluniacypris Kempf, 2015
- Genus Kunluniacypris Kempf, 2015
- Genus Lacrimacypris Halse & McRae, 2004
- Genus Lacrimicypris Halse & McRae, 2004
- Genus Leptocypris Sars, 1903
- Genus Limanocypris
- Genus Liocypris Sars, 1924
- Genus Lithocypris Martens, Almeida & Higuti, 2023
- Genus Macunhaella Almeida-Lima, Guzmán, Maia, Jesus & Piovesan, 2024 †
- Genus Malawidopsis Jacobs & Martens, 2022
- Genus Marginella Mishina, 1972 † accepted as Mishinaella Kempf, 2016 †
- Genus Martenscypridopsis Karanovic, 2000
- Genus Martensina Savatenalinton, 2022
- Genus Mecynocypria Rome, 1962
- Genus Megalocypris Sars, 1898
- Genus Mesocypris Daday, 1908
- Genus Microcypris Kaufmann, 1900
- Genus Mishinaella Kempf, 2016 †
- Genus Mnementh Martens, 2007
- Genus Mytilocypris McKenzie, 1966
- Genus Nealecypris Savatenalinton & Martens, 2009
- Genus Neocypridella Hartmann & Puri, 1972
- Genus Neocypridella Vávra, 1895
- Genus Neocypridopsis Klie, 1940
- Genus Neomangaloria Honnappa, Pathy & Abrar, 1984
- Genus Neopotamocypris Savatenalinton, 2024
- Genus Neostrandesia Ferreira, Higuti & Martens, 2019
- Genus Notadromas Herrick, 1882 † accepted as Notodromas Lilljeborg, 1853
- Genus Notiocypridopsis De Deckker, 1981 †
- Genus Notodromas Lilljeborg, 1853
- Genus Notodromus Zittel, 1885 accepted as Notodromas Lilljeborg, 1853
- Genus Paracypretta Sars, 1924
- Genus Paranacypris Higuti, Meisch & Martens, 2009
- Genus Paranadopsis Almeida, Higuti, Ferreira & Martens, 2021
- Genus Parastenocypris Hartmann, 1964
- Genus Patcypris Halse & Martens, 2019
- Genus Periosocypris Whatley, Khosla & Rathore, 2012
- Genus Phlyctenophora McKenzie, 1967
- Genus Plesiocypridopsis Rome, 1965
- Genus Potamocypris Brady, 1870
- Species Potamocypris arcuata (Sars, 1903)
- Species Potamocypris fulva (Brady, 1868)
- Species Potamocypris granulosa Daday, 1902
- Species Potamocypris hyboforma Dobbin, 1941
- Species Potamocypris mandingensis Krutak, 1971
- Species Potamocypris pallida Alm, 1914
- Species Potamocypris smaragdina (Vavra, 1891)
- Species Potamocypris unicaudata Schaefer, 1943
- Genus Prioncypris
- Genus Prionocypris Brady & Norman, 1896 accepted as Eucypris Vávra, 1891
- Genus Pseudocypretta Klie, 1932
- Genus Pseudocypridopsis Karanovic, 1999
- Genus Pseudocypris Daday, 1910
- Genus Pseudoeucypris Schneider in Schneider, Kuznetsova & Kats, 1957 †
- Genus Pseudoilyocypris Ferguson, 1967
- Genus Pseudostrandesia Savatenalinton & Martens, 2009
- Genus Psychrodromus Danielopol & McKenzie, 1977
- Genus Raepula Wilkinson, Wilby, Williams, Siveter, Page, Leggitt & Riley, 2010 †
- Genus Ramotha Martens, 1992
- Genus Repandocypris Halse & McRae, 2004
- Genus Reticypris McKenzie, 1978
- Genus Ryocypris Klie, 1935
- Genus Sarscypridopsis McKenzie, 1977
- Genus Sclerocypris Sars, 1924
- Genus Scottia Brady & Norman, 1889
- Genus Scottiana Carus, 1890
- Genus Siamopsis Savatenalinton, 2017
- Genus Somalicypris Martens, 1997
- Genus Songkhramodopsis Savatenalinton, 2023
- Genus Spirocypris Sharpe, 1903
- Genus Standesia
- Genus Stenocypris Sars, 1889 †
- Genus Strandesia Stuhlmann, 1888
- Genus Talicypridea Khand, 1977 †
- Genus Tanganyikacypridopsis Martens, 1985
- Genus Tanganyikacypris Kiss, 1961
- Genus Tanycypris Triebel, 1959
- Genus Thaicypridopsis Savatenalinton, 2018
- Genus Thaicypris Savatenalinton, 2022
- Genus Thermopsis Külköylüoğlu, Meisch & Rust, 2003
- Genus Tonnacypris Diebel & Pietrzeniuk, 1975 †
- Genus Trajancypris Martens, 1989
- Genus Trapezia Carbonnel, 1969 †
- Genus Triangocypretta Ferreira, Higuti & Martens, 2023
- Genus Trigonocypris De Deckker, 1976
- Genus Trilocypris Halse & Martens, 2019
- Genus Tungucypridopsis Victor & Fernando, 1983
- Genus Virgatocypris Malz & Moayedpour, 1973 †
- Genus Zonocypretta De Deckker, 1981
- Genus Zonocypris G.W. Müller, 1898
- Family Cypridopsidae Kaufmann, 1900
- Family Cytheralisonidae Jellinek & Swanson, 2003
- Family Cytherettidae
- Family Cytheridae Baird, 1850
- Family Cytherideidae Sars, 1925
- Family Cytherissinellidae Kashevarova, 1958 †
- Family Cytheroidea incertae sedis
- Family Cytheromatidae Elofson, 1939
- Family Cytheruridae Müller, 1894
- Family Darwinulidae
- Family Editiidae Knuepfer, 1967 †
- Family Entocytheridae Hoff, 1942
- Family Eucytheridae Puri, 1954
- Family Geisinidae Sohn, 1961 †
- Family Gerodiidae †
- Family Geroiidae Gruendel, 1962 †
- Family Healdiidae Harlton, 1933 †
- Family Healdioidea incertae sedis †
- Family Hemicytheridae Puri, 1953
- Family Ilyocyprididae Kaufmann, 1900
- Family Keysercytheridae Karanovic & Brandão, 2014
- Family Kliellidae Schäfer, 1945
- Family Krithidae Mandelstam, 1958
- Family Leguminocythereididae accepted as Trachyleberididae Sylvester-Bradley, 1948
- Family Leptocytheridae Hanai, 1957
- Family Limnocytheridae Klie, 1938
- Family Loxoconchidae Sars, 1865
- Family Macrocyprididae Müller, 1912
- Family Microcheilinellidae Gramm, 1975 †
- Family Microcytheridae Klie, 1938
- Family Neocytherideidae
- Family Neocytherideididae Puri, 1957
- Family Nesideidae
- Family Notodromadidae Kaufmann, 1900
- Family Notodromatidae
- Family Nunanidae McKenzie, Reyment & Reyment, 1993 † accepted as Paracytheridae Puri, 1974
- Family Oncocyprididae
- Family Osticytheridae Hartmann, 1980
- Family Pachydomellidae Berdan & Sohn, 1961 †
- Family Paracyprididae Sars, 1923 accepted as Candonidae Kaufmann, 1900
- Family Paracytheridae Puri, 1974
- Family Paracytherideidae Puri, 1957
- Family Paradoxostomatidae Brady & Norman, 1889
- Family Parvocytheridae Hartmann, 1959
- Family Pectocytheridae Hanai, 1957
- Family Pleurocytheridae Mandelstam, 1960 †
- Family Podocopida (awaiting allocation)
- Family Podocopida incertae sedis
- Family Pontocyprididae Müller, 1894
- Family Progonocytheridae Sylvester-Bradley, 1948
- Family Protocytheridae Ljubimova, 1956
- Family Psammocytheridae Klie, 1938
- Family Pseudolimnocytheridae
- Family Pussellidae Danielopol in Maddocks, 1976
- Family Quasillitidae Coryell & Malkin, 1936 †
- Family Rectonariidae Gruendel, 1962 †
- Family Rishonidae Sohn, 1960 †
- Family Rockalliidae
- Family Ropolonellidae Coryell & Malkin, 1936 †
- Family Saididae Aranki, McKenzie, Reyment & Reyment, 1992
- Family Saipanellidae †
- Family Schizocytheridae Howe, 1961
- Family Schulerideidae Mandelstam, 1959 †
- Family Sigilliidae Mandelstam, 1960
- Family Speluncellidae Schneider, 1960 †
- Family Suchonellidae Mishina, 1972 †
- Family Terrestricytheridae Schornikov, 1969
- Family Thaerocytheridae Hazel, 1967
- Family Thlipsuridae Ulrich, 1894 †
- Family Trachyleberididae Sylvester-Bradley, 1948
- Family Trapezoidellidae Sohn, 1979 †
- Family Tricornidae Blumenstengel, 1965 †
- Family Tricorninidae Blumenstengel, 1965 †
- Family Xestoleberidae accepted as Xestoleberididae Sars, 1928
- Family Xestoleberididae Sars, 1928
- 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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