Between brackets is the number of accepted species
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2 Shows the number of accepted species within the taxon
3 The last expanded taxon is highlighted
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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
- 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
- Genus Ambolus Ikeya, Jellinek & Tsukagoshi, 1998
- Genus Ambostracon Hazel, 1962 †
- Genus Anterocythere McKenzie & Swain, 1967
- Genus Arutella Bonaduce, Ruggieri & Russo, 1987 †
- Genus Auradilus Jellinek, 1995
- Genus Auricythere de Morais & Coimbra, 2014
- Genus Aurila Pokorny, 1955
- Genus Australicythere Benson, 1964
- Genus Austroaurila Whatley, Chadwick, Coxill & Toy, 1987
- Genus Baffinicythere Hazel, 1967
- Genus Barentsovia Neale, 1974
- Genus Bensonocythere Hazel, 1967
- Genus Berguecythere Coimbra, Bottezini & Machado, 2013
- Genus Bosasella Bonaduce, 1985
- Genus Brasilicythere Sanguinetti, Ornellas & Coimbra, 1992 †
- Genus Caudites Coryell & Fields, 1937
- Genus Chapmanella Neil, 1994 †
- Genus Cimbaurila Ruggieri, 1976 †
- Genus Collarodontia Jellinek, 1993
- Genus Coquimba Ohmert, 1968
- Genus Cornucoquimba Ohmert, 1968
- Genus Crenaleya Ahmad, Neale & Siddiqui, 1991 †
- Genus Cuvillierina Rossi de Garcia, 1972 † accepted as Rossicuvillierina Brandão, 2017 †
- Genus Daishakacythere Irizuki, 1993
- Genus Elofsonella Pokorny, 1955
- Genus Falklandia Whatley, Chadwick, Coxill & Toy, 1987
- Genus Favella Coryell & Fields, 1937 †
- Genus Finmarchinella Swain, 1963 †
- Genus Flabellimutilus Bonaduce, Ruggieri & Russo, 1987 †
- Genus Galapagocythere Bate, Whittaker & Mayes, 1981
- Genus Graptocythere Ruggieri, 1972 †
- Genus Grinioneis Liebau, 1975 †
- Genus Hadropleura Liebau, 1991 †
- Genus Hadropleuranella Kempf, 2011 †
- Genus Harleya Jellinek & Swanson, 2003
- Genus Hemicythere Sars, 1925
- Genus Hemicytheria Pokorny, 1955
- Genus Hemicytheridea Kingma, 1948 †
- Genus Hermania Puri, 1954 accepted as Hermanites Puri, 1955
- Genus Hermanites Puri, 1955
- Genus Heterocythereis Elofson, 1941
- Genus Hornibrookella Moos, 1965 †
- Genus Jacobella Swanson, 1979
- Genus Johnnealella Hanai & Ikeya, 1991 †
- Genus Jugosocythereis Puri, 1957 †
- Genus Kempfidea Weiss, 1998 †
- Genus Laperousecythere Brouwers, 1993
- Genus Mackenzina Neil, 1994 †
- Genus Malzella Hazel, 1983 †
- Genus Margocythere McKenzie, Reyment & Reyment, 1991 †
- Genus Martiniportella Liebau, 2020 †
- Genus Matsucythere Hu & Tao, 2008
- Genus Meridionalicythere Whatley, Chadwick, Coxill & Toy, 1987
- Genus Muellerina Bassiouni, 1965
- Genus Mullerina Bassiouni, 1965 accepted as Muellerina Bassiouni, 1965
- Genus Nanocoquimba Ohmert, 1968 †
- Genus Neobuntonia Hartmann, 1981
- Genus Neocaudites Puri, 1960
- Genus Neohornibrookella Jellinek, 1993
- Genus Neosinocythere Huang, 1985
- Genus Nereina Mandelshtam in Schneider, Kuznetsova & Kats, 1957 † accepted as Finmarchinella Swain, 1963 †
- Genus Nodocoquimba Hu & Tao, 2008
- Genus Nonurocythereis Ruggieri & Russo, 1980 †
- Genus Notocarinovalva Neil, 1994 †
- Genus Notopleura Liebau, 1991 †
- Genus Orionina Puri, 1954
- Genus Palaciosa Hartmann, 1959 accepted as Hartmannosa Özdikmen, 2009
- Genus Parahermanites Hu & Tao, 2008
- Genus Parapokornyella Babinot, 1980 †
- Genus Paraquadracythere Jellinek, 1993
- Genus Patagonacythere Hartmann, 1962
- Genus Pokornyella Oertli, 1956 † accepted as Urocythere Howe, 1951 †
- Genus Poseidonomicus
- Genus Procythereis Skogsberg, 1928
- Genus Pseudaurila Hu, 1981 †
- Genus Pseudoaurila Ishizaki & Kato, 1976
- Genus Puriana Coryell & Fields in Puri, 1953
- Genus Radimella Pokorny, 1969
- Genus Reussicythere van den Bold, 1966
- Genus Robustaurila Yajima, 1982
- Genus Romeis Sywula, 1969 †
- Genus Rossicuvillierina Brandão, 2017 †
- Genus Ruggiericythere Aiello, Coimbra & Barra, 2004 †
- Genus Senesia Jiricek, 1974 †
- Genus Serratocythere Hartmann, 1979
- Genus Severinella Olteanu, 2003 †
- Genus Shungyangella Hu & Tao, 2008
- Genus Sinocythere Hou in Hou & Tian, 1982 †
- Species Sinocythere dongtaiensis Chen, 1982 †
- Species Sinocythere hackka Hu & Tao, 2008 †
- Species Sinocythere sinensis Hou, 1982 †
- Species Sinocythere superba Guan, 1978 †
- Species Sinocythere yowdyi Hu & Tao, 2008 †
- Genus Sinoradimella Hu & Tao, 1986 †
- Genus Syrtica Bonaduce, Ruggieri, Russo & Bismuth, 1992 †
- Genus Tenedocythere Sissingh, 1972 †
- Genus Tepidiora Jellinek, 1995
- Genus Thesceloscythere Whatley, Jones & Roberts, 2004 †
- Genus Tyrrhenocythere Dubowsky, 1926
- Genus Tyrrhenocythere Ruggieri, 1955
- Genus Urocythereis Ruggieri, 1950
- Genus Uromuellerina Bassiouni, 1969 †
- Genus Waiparacythereis Swanson, 1969 †
- Genus Yezocythere Hanai & Ikeya, 1991 †
- 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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