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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- Copepoda (14 778)
- Infraclass Copepoda incertae sedis (16)
- Infraclass Neocopepoda (14 751)
- Superorder Gymnoplea (2 734)
- Order Calanoida (2 734)
- Family Acartiidae Sars G.O., 1903 (91)
- Family Aetideidae Giesbrecht, 1892-1893 (236)
- Genus Aetideopsis Sars G.O., 1903 (12)
- Genus Aetideus Brady, 1883 (12)
- Genus Autanepsius Wolfenden, 1906 accepted as Pseudeuchaeta Sars G.O., 1905
- Genus Azygokeras Koeller & Littlepage, 1976 (1)
- Genus Batheuchaeta Brodsky, 1950 (9)
- Genus Bradyanus Vanhöffen, 1897 accepted as Bradyidius Giesbrecht, 1897
- Genus Bradyetes Farran, 1905 (7)
- Genus Bradyidius Giesbrecht, 1897 (20)
- Genus Bryaxis Sars G.O., 1901 accepted as Bryaxona Strand, 1929
- Genus Bryaxona Strand, 1929 accepted as Comantenna Wilson C.B., 1924
- Genus Chiridiella Sars G.O., 1907 (18)
- Genus Chiridius Giesbrecht, 1893 (8)
- Genus Chirundina Giesbrecht, 1895 (4)
- Genus Chirundinella Tanaka, 1957 (1)
- Genus Comantenna Wilson C.B., 1924 (5)
- Genus Crassantenna Bradford, 1969 (2)
- Genus Derjuginia Jaschnov, 1947 accepted as Jaschnovia Markhaseva, 1980
- Genus Euaetideus Sars G.O., 1925 accepted as Aetideus Brady, 1883
- Genus Euchirella Giesbrecht, 1888 (23)
- Genus Faroella Wolfenden, 1904 accepted as Aetideopsis Sars G.O., 1903
- Genus Farrania Sars G.O., 1920 (5)
- Genus Gaetanus Giesbrecht, 1888 (26)
- Genus Gaidiopsis Scott A., 1909 (1)
- Genus Gaidius Giesbrecht, 1895 accepted as Gaetanus Giesbrecht, 1888
- Genus Jaschnovia Markhaseva, 1980 (2)
- Genus Lutamator Bradford, 1969 (3)
- Genus Mesocomantenna Alvarez, 1986 (1)
- Genus Mesogaidius Wolfenden, 1911
- Genus Mesundeuchaeta Wolfenden, 1911 accepted as Undeuchaeta Giesbrecht, 1888
- Genus Paivella Vervoort, 1965 (2)
- Genus Parabradyidius Schulz & Markhaseva, 2000 (2)
- Genus Paracomantenna Campaner, 1978 (6)
- Genus Paraetideus Paulsen, 1909 accepted as Aetideus Brady, 1883
- Genus Plagiopus Brady, 1918
- Genus Prolutamator Markhaseva & Schulz, 2008 (3)
- Genus Pseudaetideus Wolfenden, 1904 accepted as Aetideopsis Sars G.O., 1903
- Genus Pseudeuchaeta Sars G.O., 1905 (8)
- Genus Pseudochirella Sars G.O., 1920 (31)
- Genus Pseudogaetanus Brodsky, 1950 accepted as Gaetanus Giesbrecht, 1888
- Genus Pseudoothrix Brady, 1918 (1)
- Genus Pseudotharybis Scott T., 1909 (6)
- Genus Pterochirella Schulz, 1990 (1)
- Genus Senecella Juday, 1923 (2)
- Genus Snelliaetideus Vervoort, 1949 accepted as Aetideus Brady, 1883
- Genus Sursamucro Bradford, 1969 (2)
- Genus Undeuchaeta Giesbrecht, 1888 (5)
- Genus Undinopsis Sars G.O., 1902 accepted as Bradyidius Giesbrecht, 1897
- Genus Valdiviella Steuer, 1904 (7)
- Genus Wilsonidius Tanaka, 1969 accepted as Chirundina Giesbrecht, 1895
- Family Arctokonstantinidae Markhaseva & Kosobokova, 2001 (4)
- Family Arietellidae Sars G.O., 1902 (65)
- Family Augaptilidae Sars G.O., 1905 (129)
- Family Bathypontiidae Brodsky, 1950 (21)
- Family Boholiniidae Fosshagen, in Fosshagen & Iliffe, 1989 accepted as Pseudocyclopidae Giesbrecht, 1892-1893
- Family Calanidae Dana, 1846 (39)
- Family Calocalanidae Bernard, 1958 accepted as Paracalanidae Giesbrecht, 1893
- Family Candaciidae Giesbrecht, 1892-1893 (31)
- Family Centropagidae Giesbrecht, 1892 (131)
- Family Clausocalanidae Giesbrecht, 1893 (33)
- Family Diaixidae Sars G.O., 1902 (19)
- Family Diaptomidae Baird, 1850 (550)
- Family Discoidae Gordejeva, 1975 (31)
- Family Epacteriscidae Fosshagen, 1973 (31)
- Family Eucalanidae Giesbrecht, 1893 (21)
- Family Euchaetidae Giesbrecht, 1893 (112)
- Family Fosshageniidae Suárez-Morales & Iliffe, 1996 (5)
- Family Heterorhabdidae Sars G.O., 1902 (67)
- Family Hyperbionycidae Ohtsuka, Roe & Boxshall, 1993 (3)
- Family Kyphocalanidae Markhaseva & Schulz, 2009 (1)
- Family Lucicutiidae Sars G.O., 1902 (45)
- Family Mecynoceridae Andronov, 1973 accepted as Paracalanidae Giesbrecht, 1893
- Family Megacalanidae Sewell, 1947 (22)
- Family Mesaiokeratidae Matthews, 1961 (9)
- Family Metridiidae Sars G.O., 1902 accepted as Metridinidae Sars G.O., 1902
- Family Metridinidae Sars G.O., 1902 (38)
- Family Nullosetigeridae Soh, Ohtsuka, Imabayashi & Suh, 1999 (10)
- Family Paracalanidae Giesbrecht, 1893 (88)
- Family Parapontellidae Giesbrecht, 1893 (2)
- Family Parkiidae Ferrari F.D. & Markaseva, 1996 (1)
- Family Phaennidae Sars G.O., 1902 (87)
- Family Phyllopodidae Brodsky, 1950 accepted as Nullosetigeridae Soh, Ohtsuka, Imabayashi & Suh, 1999
- Family Pontellidae Dana, 1852-1853 (181)
- Family Pseudocalanidae Sars G.O., 1901 accepted as Clausocalanidae Giesbrecht, 1893
- Family Pseudocyclopidae Giesbrecht, 1892-1893 (79)
- Family Pseudocyclopiidae Sars G.O., 1902 (14)
- Family Pseudodiaptomidae Sars G.O., 1902 (83)
- Family Rhincalanidae Geletin, 1976 (3)
- Family Ridgewayiidae Wilson M.S., 1958 accepted as Pseudocyclopidae Giesbrecht, 1892-1893
- Family Rostrocalanidae Markhaseva, Schulz & Martínez Arbizu, 2009 (2)
- Family Ryocalanidae Andronov, 1974 (10)
- Family Scolecithricidae Giesbrecht, 1892 accepted as Scolecitrichidae Giesbrecht, 1893
- Family Scolecitrichidae Giesbrecht, 1893 (210)
- Family Scolecitricidae Sars G.O., 1900 accepted as Scolecitrichidae Giesbrecht, 1893
- Family Spinocalanidae Vervoort, 1951 (47)
- Family Stephidae Sars G.O., 1902 (41)
- Family Subeucalanidae Geletin, 1976 accepted as Eucalanidae Giesbrecht, 1893
- Family Sulcanidae Nicholls, 1945 (1)
- Family Temoridae Giesbrecht, 1893 (46)
- Family Tharybidae Sars G.O., 1902 (46)
- Family Tortanidae Sars G.O., 1902 (49)
- Genus Eikocalanus Boeck, 1867
- Superorder Podoplea (12 017)
- Superorder Rhabdomoplea accepted as Podoplea
- Infraclass Progymnoplea (11)
- Order Herpyllobioida accepted as Herpyllobiidae Hansen, 1892