Between brackets is the number of accepted extant species
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Shows the number of accepted extant species within the taxon
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- Biota (12 685)
- Kingdom Animalia (9 791)
- Phylum Acanthocephala (30)
- Phylum Annelida (617)
- Phylum Arthropoda (4 265)
- Subphylum Chelicerata (489)
- Subphylum Crustacea (3 772)
- Superclass Allotriocarida (977)
- Superclass Multicrustacea (2 339)
- Superclass Oligostraca (456)
- Class Ichthyostraca (1)
- Class Ostracoda (455)
- Subclass Myodocopa (157)
- Subclass Ostracoda incertae sedis (1)
- Subclass Platycopa accepted as Platycopida
- Subclass Podocopa (297)
- Order Platycopida (4)
- Order Podocopida (293)
- Suborder Bairdiocopina (16)
- Suborder Cypridocopina (48)
- Suborder Cytherocopina (229)
- Superfamily Cytheroidea Baird, 1850 (229)
- Family Bythocytheridae Sars, 1926 (26)
- Family Cobanocytheridae Schornikov, 1975 (1)
- Family Collisarborisidae Neale, 1975 †
- Family Cushmanideidae Puri, 1974 in Hartmann & Puri, 1974 (1)
- Family Cytheralisonidae Jellinek & Swanson, 2003 (1)
- Family Cytherettidae Triebel, 1952 accepted as Cytherettinae Triebel, 1952
- Family Cytheridae Baird, 1850 (5)
- Family Cytherideidae Sars, 1925 (2)
- Family Cytheromatidae Elofson, 1939
- Family Cytheruridae Müller, 1894 (54)
- Family Entocytheridae Hoff, 1942
- Family Eucytheridae Puri, 1954 (1)
- Family Hemicytheridae Puri, 1953 (29)
- Family Krithidae Mandelstam, 1958 (3)
- Family Leptocytheridae Hanai, 1957 (7)
- Family Loxoconchidae Sars, 1925 (4)
- Family Microcytheridae Klie, 1938 (2)
- Family Neocytherideididae Puri, 1957 (3)
- Family Paracytheridae Puri, 1974
- Family Paracytherideidae Puri, 1957 (1)
- Family Paradoxostomatidae Brady & Norman, 1889 (23)
- Family Pectocytheridae Hanai, 1957 (4)
- Family Progonocytheridae Sylvester-Bradley, 1948
- Family Protocytheridae Ljubimova, 1956
- Family Schizocytheridae Howe, 1961 accepted as Schizocytherinae Mandelstam, 1959
- Family Schulerideidae Mandelstam, 1959 †
- Family Thaerocytheridae Hazel, 1967 (19)
- Family Trachyleberididae Sylvester-Bradley, 1948 (35)
- Subfamily Cytherettinae Triebel, 1952 (1)
- Subfamily Echinocythereidinae Hazel, 1967 accepted as Echinocythereidini Hazel, 1967 †
- Subfamily Trachyleberidinae Sylvester-Bradley, 1948 (4)
- Subfamily Unicapellinae Dingle, 1981 (2)
- Genus Abyssophilos Jellinek & Swanson, 2003 (1)
- Genus Agrenocythere Benson, 1972 (2)
- Genus Agulhasina Dingle, 1971 †
- Genus Anebocythereis Bate, 1972 † (1)
- Genus Anticythereis Bold, 1946 †
- Genus Apatihowella Jellinek & Swanson, 2003 (4)
- Subgenus Apatihowella (Fallacihowella) Jellinek & Swanson, 2003 accepted as Fallacihowella Jellinek & Swanson, 2003
- Species Apatihowella (Fallacihowella) caligo Jellinek & Swanson, 2003 accepted as Fallacihowella caligo Jellinek & Swanson, 2003
- Species Apatihowella (Fallacihowella) sol Jellinek & Swanson, 2003 accepted as Fallacihowella sol (Jellinek & Swanson, 2003)
- Species Apatihowella caligo Jellinek & Swanson, 2003 represented as Apatihowella (Fallacihowella) caligo Jellinek & Swanson, 2003
- Species Apatihowella heros (Whatley, Staunton, Kaesler & Moguilevsky, 1996)
- Species Apatihowella inradata Jellinek & Swanson, 2003
- Species Apatihowella macrocicatricosa (Whatley, Moguilevsky, Chadwick, Toy & Ramos, 1998)
- Species Apatihowella rustica Jellinek & Swanson, 2003
- Species Apatihowella sol Jellinek & Swanson, 2003 accepted as Apatihowella (Fallacihowella) sol Jellinek & Swanson, 2003
- Genus Argenticytheretta Rossi De Garcia, 1969 † (1)
- Genus Atlanticythere Benson, 1977 †
- Genus Austrotrachyleberis Hartmann, 1988 (1)
- Genus Ayressoleberis Brandão & Yasuhara, 2013 (1)
- Genus Bathycythere Sissingh, 1971 (1)
- Genus Callocythere Whatley, Moguilevsky, Ramos & Coxill, 1998 (1)
- Genus Cativella Coryell & Fields, 1937 (1)
- Genus Clinocythereis Ayress & Swanson, 1991 (1)
- Genus Fallacihowella Jellinek & Swanson, 2003 (2)
- Genus Falsobuntonia Malz, 1982 †
- Genus Falsocythere Ruggieri, 1972 †
- Genus Legitimocythere Coles & Whatley, 1989 (2)
- Genus Marwickcythereis Whatley & Millson, 1992 †
- Genus Neocythereis Omatsola, 1972
- Genus Oertiella Pokorny, 1964 †
- Genus Paleoabyssocythere Benson, 1977 †
- Genus Pennyella Neale, 1974
- Genus Phacorhabdotus Howe & Laurencich, 1958 †
- Genus Philoneptunus Whatley, Millson & Ayress, 1992 (3)
- Genus Pseudobosquetina Guernet & Moullade, 1994 (2)
- Genus Pseudocythereis Skogsberg, 1928 (2)
- Genus Pterygocythere Hill, 1954 †
- Genus Pterygocythereis Blake, 1933
- Genus Rabilimis Hazel, 1967 (1)
- Genus Rockallia Whatley, Frame & Whittaker, 1978 accepted as Arcacythere Hornibrook, 1952
- Genus Rugocythereis Dingle, Lord & Boomer, 1990
- Genus Suhmicythere Benson, 1974
- Genus Taracythere Ayress, 1995 (1)
- Family Xestoleberididae Sars, 1928 (8)
- Genus Flexuocythere Ciampo, 1986 †
- Class Maxillopoda
- Subphylum Myriapoda (4)
- Phylum Brachiopoda (64)
- Phylum Bryozoa (363)
- Phylum Cephalorhyncha
- Phylum Chaetognatha (25)
- Phylum Chordata (1 415)
- Phylum Cnidaria (460)
- Phylum Ctenophora (11)
- Phylum Dicyemida (1)
- Phylum Echinodermata (638)
- Phylum Ectoprocta accepted as Bryozoa
- Phylum Entoprocta
- Phylum Gastrotricha (1)
- Phylum Gnathostomulida
- Phylum Hemichordata (6)
- Phylum Kinorhyncha (9)
- Phylum Loricifera
- Phylum Mesozoa accepted as Dicyemida
- Phylum Mollusca (753)
- Phylum Nematoda (396)
- Phylum Nemertea (75)
- Phylum Nemertina represented as Nemertea
- Phylum Platyhelminthes (134)
- Phylum Pogonophora accepted as Siboglinidae Caullery, 1914
- Phylum Porifera (281)
- Phylum Priapulida (4)
- Phylum Rotifera (163)
- Phylum Tardigrada (80)
- Kingdom Archaea (1)
- Kingdom Bacteria (310)
- Kingdom Chromista (956)
- Kingdom Fungi (740)
- Kingdom Plantae (822)
- Kingdom Protozoa (65)
