[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988], nom. cl. inval. see Clade Tetrapoda Hatschek & Cori 1896 [Laurin 2020]
     Order Cetacea Brisson, 1762 - whales, dolphins, and porpoises see Infraorder Cetacea Brisson, 1762
       1 Family Delphinidae Gray, 1821 - oceanic dolphins
       2 Family Kogiidae Gill, 1871
       3 Family Monodontidae Gray, 1821 - white whales
       4 Family Phocoenidae Gray, 1825 - porpoises
       5 Family Physeteridae Gray, 1821 - sperm whales
       6 Family Ziphiidae Gray, 1850 - beaked whales
       7 Family Balaenidae Gray, 1821 - right whales
       8 Family Balaenopteridae Gray, 1864 - rorquals
       9 Family Eschrichtiidae Ellerman & Morrison-Scott, 1951 - gray whales