After Parker, 1981 and Martin & Davis, 2001

Alternative, older, taxonomy after Parker, 1982

<==o Calanoida Sars, 1903 (keijuhankajalkaiset)
   |-- Acartiidae Sars, 1900
   |-- Aetideidae Giesbracht, 1893
   |-- Arietellidae Sars, 1902
   |-- Augaptilidae Sars, 1905
   |-- Bathypontiidae Brodsky, 1950
   |-- Boholinidae Fosshagen & Iliffe, 1989
   |-- Calanidae Dana, 1846
   |-- Calocalanidae [not recognized by Martin & Davis]
   |-- Candaciidae Giesbrecht, 1893
   |-- Centropagidae Giesbrecht, 1893
   |-- Clausocalanidae Giesbrecht, 1893
   |-- Diaixidae Sars, 1902
   |-- Diaptomidae Baird, 1850
   |-- Discoidae Gordejeva, 1975
   |-- Epacteriscidae Fosshagen, 1973
   |-- Eucalanidae Giesbrecht, 1893
   |-- Euchaetidae Giesbrecht, 1893
   |-- Fosshageniidae Suárez-Moráles & Iliffe, 1996
   |-- Heterorhabdidae Sars, 1902
   |-- Hyperobionychidae Ohtsuka, Roe & Boxshall, 1993
   |-- Lucicutiidae Sars, 1902
   |-- Mecynoceridae Andronov, 1973
   |-- Megacalanidae Sewell, 1947
   |-- Mesaiokeratidae Matthews, 1961
   |-- Metridinidae Sars, 1902
   |-- Nullosetigeridae Soh, Ohtsuka, Imbayashi & Suh, 1999 [ Phyllopodidae; Phyllopidae, lapsus calami?]
   |-- Paracalanidae Giesbrecht, 1893
   |-- Parapontellidae Giesbrecht, 1893
   |-- Parkiidae Ferrari & Markhaseva, 1996
   |-- Pseudocalanidae [not recognized by Martin & Davis]
   |-- Phaennidae Sars, 1902
   |-- Pontellidae Dana, 1852
   |--o Pseudocyclopiidae Sars, 1902
   |  `-- Pseudocyclopia Scott
   |--o Pseudocyclopidae Giesbrecht, 1893
   |  `-- Pseudocyclops Brady
   |-- Pseudodiaptomidae Sars, 1902
   |-- Rhincalanidae Geletin, 1976
   |-- Ridgewayiidae Wilson, 1958
   |-- Ryocalanidae Andronov, 1974
   |-- Scolecithricidae Giesbrecht, 1893
   |-- Spinocalanidae Vervoort, 1951
   |-- Stephidae Sars, 1902
   |-- Sulcanidae Nicholls, 1945
   |-- Temoridae Giesbrecht, 1893
   |-- Tharybidae Sars, 1902
   `-- Tortanidae Sars, 1902

Note:

Martin & Davis (2001) did not recognize any suborders within the Calanoida.

Reference(s):