After Nowak, 1990, McKenna & Bell, 1997, Bianucci & Landini, 2006, and Lambert et al., 2010b, with species from “The Paleobiology Database” (Uhen, 2000-2006)

<==o Physeteroidea Gray, 1821 (sperm whales and relatives; kaskelotinsukuiset hammasvalaat)
   `--o Physeteridae Gray, 1821 sensu McKenna & Bell, 1997 [CetodontidaePhysodontidae” Lydekker 1894] [incl. Kogiidae] (sperm whales; kaskelotit ja (kääpiökaskelotit))
      |?-o †Dinoziphius Van Beneden & Gervais, 1868 (nomen dubium)
      |  |?- †D. roemdorkii Van Beneden & Gervais, 1868 (nomen dubium, type)
      |  `-- †D. carolinensis Leidy 1877
      |?- †Ferecetotherium kelloggi Mchedlidze, 1970
      |?- †Helvicetus rugosus Pilleri, 1986
      |?- †Albicetus oxymycterus (Kellogg, 1925) Boersma & Pyenson, 2015 [Ontocetus oxymycterus Kellogg, 1925]
      |?- †Preaulophyseter gualichensis Caviglia & Jorge, 1980
      |?-o †Plesiocetopsis Brandt, 1873 [Plesiocetus]
      |  |-- †P. hupschii ( Van Beneden, 1859) [Cetotherium (Plesiocetopsis) hupschii; Cetotherium (Plesiocetus) hupschi; Cetotherium hupschi; Heterocetus hupschii; Plesiocetus hupschi; Plesiocetus hupschii]
      |  `-- †P. notopelagicus Cabrera, 1926
      |?- †“Orcasemseyi Bockh, 1899 (invalid subgroup)
      |?- †Orcopsis acutidens (von Meyer, 1859) Van Beneden, 1876 (nomen dubium)
      |?- †Physotherium solterii Portis 1885 (nomen dubium)
      |?-o †Ziphioides Probst, 1886 (nomen dubium)
      |  |-- †Z. obliquus Probst, 1886
      |  |-- †Z. triangularis Probst, 1886
      |  `-- †Z. triangulus Probst, 1886
      |--o †Hoplocetinae Cabrera, 1926
      |  |--o †Scaldicetus Du Bus, 1867 [taxonomic history]
      |  |  |?- †“Physodon” lorteti Deperet 1887
      |  |  |-- †S. bellunensis Dal Piaz 1922
      |  |  |-- †S. caretti Du Bus 1867
      |  |  |?- ?†S. crispus (nomen nudum)
      |  |  |-- †S. degiorgii Varola & Pilleri, 1988
      |  |  |-- †S. grandis (Du Bus, 1872)
      |  |  |-- †S. inflatus Cigala-Fulgosi & Pilleri, 1985
      |  |  |-- †S. leccense (Gervais, 1872)
      |  |  |-- †S. lodgei Chapman, 1917
      |  |  |-- †S. macgeei Chapman, 1912
      |  |  |-- †S. minor (Portis, 1885)
      |  |  |-- †S. mortezelensis (du Bus, 1872)
      |  |  `-- †S. perpinguis (Pilleri & Pilleri, 1982)
      |  |--o †Idiorophus Kellogg, 1925 [taxonomic history]
      |  |  |-- †I. bolzanensis (Dal Piaz, 1916) [taxonomic history]
      |  |  `-- †I. patagonicus (Lydekker, 1894) [taxonomic history]
      |  |-- †Diaphorocetus poucheti (Moreno, 1892) Ameghino, 1892 [Mesocetus poucheti Moreno, 1892; Diaphorocetus poucheti Ameghino, 1892; Paracetus poucheti Moreno, 1892; Hypocetus poucheti Lydekker, 1894; Diaphorocetus poucheti Trouessart, 1898; Diaphorocetus poucheti Cabrera, 1926; Diaphorocetus poucheti Cozzuol, 1996; Diaphorocetus poucheti Kazar, 2002; Diaphorocetus poucheti Hampe, 2006]
      |  `--o †Hoplocetus Gervais, 1848 [=? Haplocetus]
      |     |-- †H. borgerhoutensis Du Bus, 1872
      |     |-- †H. crassidens Gervais, 1848
      |     |-- †H. curvidens Gervais, 1852
      |     |-- †H. obesus Leidy, 1868
      |     `-- †H. ritzi Hampe, 2006
      `--+--+-- †Acrophyseter deinodon Lambert, Bianucci & Muizon, 2008
         |  `--+-- †Brygmophyseter shigensis (Hirota & Barnes 1995) Kimura et al., 2006
         |     `--+-- †Zygophyseter varolai Bianucci & Landini, 2006; L.Mioc. Mid.
         |        `-- †Naganocetus shigensis (Hirota & Barnes, 1995) Bianucci & Landini, 2006 [Scaldicetus shigensis Hirota & Barnes, 1995]
         `--+-- †Livyatan melvillei (Lambert et al., 2010b) Lambert et al., 2010a [Leviathan Lambert et al., 2010b (non Leviathan Koch, 1841, a jr. synon of Mammut Blumenbach, 1799)]
            `--+-- †Placoziphius duboisii van Beneden, 1869
               `--+--o †Orycterocetus Leidy, 1853 [Gargantuodon Ginsburg, 1969]
                  |  |-- †O. cornutidens Leidy, 1856
                  |  |-- †O. crocodilinus Cope, 1868 [Gargantuodon ligerensis Ginsburg, 1969]
                  |  `-- †O. quadratidens Leidy, 1853
                  `--+--o Kogiinae Gill, 1871 [Kogiidae Gill sensu Bianucci & Landini, 2006, Lambert et al., 2010b] (dwarf sperm whales; kääpiökaskelotit)
                     |  |?- †Miokogia elongatus Pilleri, 1986 (nomen dubium)
                     |  |?- †Kogiopsis floridana Kellogg, 1929 (nomen dubium)
                     |  |-- †Aprixokogia kelloggi Whitmore & Kaltenbach, 2008
                     |  `--+-- †Thalassocetus antwerpiensis Abel, 1905
                     |     `--+-- †Scaphokogia cochlearis de Muizon, 1988
                     |        `--+-- †Praekogia cedrosensis Barnes, 1973
                     |           `--o Kogia (dwarf sperm whale; kääpiökaskelotit)
                     |              |?- †K. sp. [Plioc. SEu. Italy]
                     |              |?- †K. pusilla (Pilleri, 1987)
                     |              |-- K. breviceps Blainville, 1838 (pygmy sperm whale; kääpiökaskelotti)
                     |              `-- K. simus Owen, 1866 [Kogia sima] (dwarf sperm whale; pikkukaskelotti)
                     `--o Physeteridae Gray, 1821 sensu Lambert et al., 2010b
                        |-- †Physeterula dubusii van Beneden, 1877
                        |-- †Idiophyseter merriami Kellogg, 1925
                        `--+--o †Aulophyseterinae Kazar, 2002
                           |  `--o †Aulophyseter Kellogg, 1927 [=? Auiophyseter (lapsus calami?)]
                           |     |-- †A. mediatlanticus (Cope, 1895) Kazar, 2002 [Paracetus mediatlanticus Cope, 1895; Diaphorocetus mediatlanticus Trouessart, 1898; Hypocetus mediatlanticus Hay, 1902; Hypocetus mediatlanticus Case, 1904; Diaphorocetus mediatlanticus Sellards, 1915; Orycterocetus mediatlanticus Kellogg, 1925; Orycterocetus mediatlanticus Gottfried et al., 1994; Aulophyseter mediatlanticus Kazar, 2002]
                           |     |-- †A. morricei Kellogg, 1927
                           |     `-- †A. rionegrensis Gondar, 1974
                           `--o Physeterinae Gray, 1821 [Physeteridae Gray sensu Bianucci & Landini, 2006] (sperm whales; kaskelotit)
                              |?-o †Balaenodon Owen, 1846 (nomen dubium)
                              |  |?- †B. lentianus
                              |  |-- †B. affinis Owen, 1843
                              |  `-- †B. physaloides Owen, 1846 [Physeter physaloides Brandt, 1873]
                              |?- †Priscophyseter typus Portis, 1885 (nomen dubium)
                              |?- †Prophyseter dolloi Abel 1905 (nomen dubium)
                              |?- †Physetodon baileyi McCoy 1879 (nomen dubium)
                              `--o Physeter Linnaeus 1758 [Catodon Linnaeus, 1761; Meganeuron Gray, 1866; “Stenodon” Van Beneden 1865; Stenodon campbelli Frailey, 1986]
                                 |-- †P. antiquus Leidy 1853
                                 |-- †P. vetus (Leidy 1869)
                                 `-- P. macrocephalus Linnaeus, 1758 [Physeter catodon; Catodon canadensis Lesson, 1828; Catodon sibbaldi Fleming, 1828] (giant sperm whale; kaskelotti)

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