After Dawson, 1996ab, McKenna & Bell, 1997, Bianucci, 2001, Kazár & Grigorescu, 2005, and Uhen, 2000-2006 [“The Paleobiology Database”]

<==o †Kentriodontidae Slijper, 1936 sensu Barnes, 1978
   |?- †Belonodelphis peruanus de Muizon, 1988b
   |?- †Incacetus broggii Colbert, 1944
   |--o †Kentriodontinae Slijper, 1936 [incl. Pithanodelphinae Barnes, 1985 sensu McKenna & Bell, 1997]
   |  |-- †Rudicetus squalodontoides (Capellini, 1878) Bianucci, 2001 [Priscodelphinus (Delphinorhynchus) squalodontoides Capellini, 1878]
   |  |--o †Kentriodon Kellogg, 1927 [Grypolithax Kellogg 1931]
   |  |  |-- †Kentriodon fuchsii (Brandt, 1873)
   |  |  |-- †Kentriodon hobetsu Ichishima, 1995
   |  |  |-- †Kentriodon obscurus (Kellogg, 1931) Barnes & Mitchell, 1984 [Grypolithax obscura Kellogg, 1931; Grypolithax pavida Kellogg, 1931]
   |  |  |-- †Kentriodon pernix Kellogg 1927
   |  |  `-- †Kentriodon schneideri Whitmore & Kaltenbach; 2008
   |  |--o †Delphinodon Leidy, 1869
   |  |  |-- †D. carniolicus (Gorjanovic-Kramberger 1882)
   |  |  |-- †D. dividum True 1912
   |  |  |-- †D. leidyi Hay 1902
   |  |  |-- †D. mento (Cope 1867)
   |  |  `-- †D. wymanii (Leidy 1862)
   |  |-- †Tagicetus joneti Lambert, Estevens & R. Smith, 2005
   |  |-- †Macrokentriodon morani Dawson, 1996b
   |  |-- †Microphocaena podolica Kudrin & Tatarinov, 1965
   |  `--o “Pithanodelphini” Barnes, 1985 [Pithanodelphinae Barnes, 1985 sensu Kazár & Grigorescu, 2005]
   |     |?- †Leptodelphis stavropolitanus Kirpichnikov, 1954
   |     |-- †Pithanodelphis cornuatus (Du Bus, 1872) Abel, 1905
   |     |-- †Sarmatodelphis moldavicus Kirpichnikov, 1954
   |     `--o †Atocetus de Muizon, 1988
   |        |-- †A. nasalis (Barnes, 1985) [“Pithanodelphisnasalis Barnes, 1985]
   |        `-- †A. iquensis de Muizon, 1988
   `--+--o †Lophocetinae Barnes, 1978
      |  |?- †“Lophocetus” repenningi (Barnes, 1978) de Muizon, 1988a
      |  |-- †Hadrodelphis calvertense Kellogg, 1966 [incl.? H. poseidon Ginsberg & Janvier, 1971]
      |  `-- †Lophocetus calvertensis (Harlan, 1842) Cope, 1868
      `--o †Kampholophinae
         |-- †Kampholophus serrulus Rensberger, 1969
         `--o †Liolithax Kellogg 1931
            |-- †L. kernensis Kellogg, 1931
            `-- †L. pappus (Kellogg, 1955)

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