Cetacea Brisson 1762 see Suborder Cetacea Brisson, 1762
   Neoceti Fordyce & de Muizon, 2001
     Odontoceti Flower, 1867 see Parvorder Odontoceti Flower, 1867
       Physeteroidea Gray, 1821
         [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
           1 †Leviathan melvillei Lambert, Bianucci, Post, de Muizon, Salas-Gismondi, Urbina & Reumer, 2010, comb. illeg. see Livyatan melvillei (Lambert, Bianucci, Post, de Muizon, Salas-Gismondi, Urbina & Reumer, 2010)