After McKenna & Bell, 1997, and Uhen, 2000–2008 [“The Paleobiology Database”]

<==o †Squalodontidae Brandt, 1873 [Mesoceti Dames, 1894; Squalodontinae Rothausen, 1968] [paraphyletic Squalodontoidea Brandt, 1873]
   |?- †Parasqualodon wilkinsoni (McCoy. 1867) Hall, 1911 (nomen dubium)
   |?-o †Metasqualodon Hall, 1911 (nomen dubium)
   |  |-- †M. harwoodi (Sanger 1881) (type)
   |  `-- †M. symmetricus Okazaki 1982
   |?- †Prosqualodon
   |?- †Agriocetus incertus (Brandt, 1874) Abel, 1913 [Agriocetus austriacus Abel, 1913]
   |?-o †Saurocetus Agassiz, 1848
   |  |-- †S. gibbesi Agassiz, 1848
   |  `-- †S. gibbesii Agassiz, 1848
   |?- †Colophonodon
   |?-o †Microcetus Kellogg, 1923 (nomen dubium)
   |  |-- †M. ambiguus (Meyer, 1840)
   |  |-- †M. hectori Benham, 1935
   |  `-- †M. sharkovi Dubrovo & Sharkov 1971
   |?-o †Neosqualodon Dal Piaz, 1904 (nomen dubium)
   |  |-- †N. assenzae Dal Piaz, 1904
   |  |-- †N. gastaldii (Brandt, 1873)
   |  `-- †N. gastaldii gemmellaroi (Fabiani, 1949)
   |?- †Sachalinocetus cholmicus Siryk & Dubrovo, 1970
   |?- †Sulakocetus dagestanicus Mchedlidze 1976 [also treated as Waipatiid]
   |--o †Eosqualodon Rothausen, 1968
   |  |-- †E. langewieschei Rothausen, 1968
   |  `-- †E. latirostris (Capellini, 1903)
   |-- †Phoberodon arctirostris Cabrera, 1926
   |--o †Squalodon Grateloup, 1840 [Arionius Meyer, 1841; Crenidelphinus Laurillard, 1846; “Kelloggia” Mchedlidze, 1976; “Macrophoca” Leidy, 1856; “Phocodon” Agassiz, 1841; Rhizoprion Jourdan, 1861; Smilocamptus Gervais, 1849]
   |  |?- †Delphinoides gratelupi Pedroni, 1845
   |  |?- †Priscodelphinus validus Du Bus, 1872 (nomen nudum)
   |  |-- †S. andrewi Benham, 1942
   |  |--o †S. antverpiensis Van Beneden, 1861
   |  |  |-- †S. a. antverpiensis Van Beneden, 1861
   |  |  `-- †S. a. papillatus Rothausen, 1968
   |  |-- †S. atlanticus (Leidy, 1856) [Macrophoca atlantica (Leidy, 1856)]
   |  |-- †S. barbarus Aslanova, 1969 [“Kelloggia” Mchedlidze, 1976]
   |  |--o †S. bariensis (Jourdan, 1861) [Basilosaurus squalodon Grateloup, 1840]
   |  |  `-- †S. bariensis bellunensis Dal Piaz, 1901
   |  |-- †S. bellunensis (Dal Piaz, 1929)
   |  |-- †S. bordae (Gervais, 1852)
   |  |-- †S. calvertensis Kellogg, 1923
   |  |-- †S. catulli (Molin, 1859)
   |  |-- †S. dalpiazi Fabiani, 1949
   |  |-- †S. errabundus Kellogg, 1931
   |  |-- †S. grateloupi von Meyer, 1843 [S. burgueti (Gervais, 1852); S. gervaisi Van Beneden & Gervais, 1880]
   |  |-- †S. hypsispondylus Brandt, 1874
   |  |-- †S. imperator Cigala-Fulgosi & Pilleri 1985
   |  |-- †S. kelloggi Rothausen, 1968
   |  |-- †S. linzianus Brandt, 1871
   |  |-- †S. melitensis (Blainville, 1840) [S. scillae Brandt, 1873; Phocodon scillae]
   |  |-- †S. meyeri Brandt, 1873
   |  |-- †S. molassicus (Bronn, 1837)
   |  |-- †S. servatus (Meyer, 1841)
   |  |-- †S. typicus Kellogg, 1923
   |  |-- †S. vocontiorum Delfortrie, 1872
   |  |-- †S. whitmorei Dooley, 2005
   |  |-- †S. wingei Ravn, 1926
   |  `-- †S. zitteli Paquier, 1894
   |-- †Tangaroasaurus kakanuiensis Benham, 1935
   `--o Patriocetinae Abel, 1913 [Patriocetidae Abel, 1913]
      `--o †Patriocetus (van Beneden, 1865) Abel, 1913
         |-- †P. sp. indet.
         |-- †P. denggi Abel, 1913 [Cetotheriopsis linziana (Brandt, 1871)]
         |-- †P. ehrlichi (Van Beneden, 1865) (type)
         |-- †P. grateloupii (Van Beneden, 1865)
         `-- †P. kazakhstanicus Dubrovo & Sanders, 2000

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