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
               Synrhina Geisler et al., 2011
                 Delphinida de Muizon, 1984
                   Superfamily Inioidea de Muizon, 1988
                     Family Iniidae Gray, 1846 - boutos
                       1 Genus Inia d'Orbigny, 1834 - Amazon River dolphin
                       2 Genus †Goniodelphis Allen, 1941
                       3 Genus †Ischyrorhynchus Ameghino, 1891
                       4 Genus †Isthminia Pyenson et al., 2015
                       5 Genus †Meherrinia Geisler, Godfrey & Lambert, 2012
                       6 Genus †Saurocetes Burmeister, 1871