Cetacea Brisson 1762 see Suborder Cetacea Brisson, 1762
   Neoceti Fordyce & de Muizon, 2001
     Odontoceti Flower, 1867 see Parvorder Odontoceti Flower, 1867
       Physeteroidea Gray, 1821
         1 [stem] Genus †Eudelphis du Bus, 1872
         2.1.1 [stem] Genus †Acrophyseter Lambert, Bianucci & de Muizon, 2008
         2.1.2.1 [stem] Genus †Zygophyseter Bianucci & Landini, 2006
         2.1.2.2 [stem] Genus †Brygmophyseter Barnes, 2006
         2.2.1 [stem] Genus †Leviathan Lambert, Bianucci, Post, de Muizon, Salas-Gismondi, Urbina & Reumer, 2010, nom. illeg. [monotypic] see Genus Livyatan Lambert, Bianucci, Post, de Muizon, Salas-Gismondi, Urbina & Reumer, 2010
         2.2.2.1 [stem] Genus †Placoziphius van Beneden, 1869
         2.2.2.2.1 [stem] Genus †Orycterocetus Leidy, 1853
         2.2.2.2.2.1 Physeteridae Gray, 1821 - sperm whales
         2.2.2.2.2.2 Kogiidae Gill, 1871