Mammalia Linnaeus 1758 [Rowe 1988], nom. cl. inval. see Class Mammalia Linnaeus, 1758
   Cetartiodactyla Montgelard, Catzeflis & Douzery 1997 see Order Cetartiodactyla Montgelard, Catzeflis & Douzery, 1997
     Whippomorpha Waddell, Okada & Hasegawa 1999 see Suborder Whippomorpha
       Cetacea Brisson 1762 see Suborder Cetacea Brisson, 1762
         Pelagiceti Uhen, 2008
           Neoceti Fordyce & de Muizon, 2001
             Odontoceti Flower, 1867 see Parvorder Odontoceti Flower, 1867
               Superfamily Physeteroidea Gray, 1821
                 Family Physeteridae Gray, 1821 - sperm whales
                   1 ?Genus †Orycterocetus Leidy, 1853
                   2 Genus Physeter Linnaeus, 1758 - sperm whale
                   3 Genus †Idiophyseter Kellogg, 1925
                   4 Genus †Physeterula van Beneden, 1877
                   5 ?Genus †Aulophyseter Kellogg, 1928