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 Kogiidae Gill, 1871
                   1 Genus Kogia Gray, 1846 - pygmy and dwarf sperm whales
                   2 Genus †Aprixokogia Whitmore & Kaltenbach, 2008
                   3 Genus †Nanokogia Velez-Juarbe et al., 2015
                   4 Genus †Praekogia Barnes, 1973
                   5 Genus †Thalassocetus Abel, 1905
                   6 Subfamily †Scaphokogiinae Muizon, 1988 [monotypic]
                   7 Genus †Kogiopsis Kellogg, 1929