Imperium naturæ C. Linnaeus, 1758 - nature
   Mundus Plinius - physical world
     naturalia - natural bodies
       Regnum Animale C. Linnaeus, 1758 - animal kingdom see Kingdom Animalia Linnaeus, 1758
         Class Mammalia Linnaeus, 1758 - mammals
           Pinnata Linnaeus, 1758 see Class Mammalia Linnaeus, 1758
             Order Cete Linnaeus, 1758 see Order Cetartiodactyla Montgelard, Catzeflis & Douzery, 1997
               Genus Balæna Linnaeus, 1758 - bowhead whale, Greenland right whale
                 1 Balaena mysticetus Linnaeus, 1758 - Arctic bowhead whale
                 2 Balaena physalus Linnaeus, 1758 see Balaenoptera physalus (Linnaeus, 1758)
                 3 Balaena boops Linnaeus, 1758
                 4 Balaena musculus Linnaeus, 1758 see Balaenoptera musculus (Linnaeus, 1758)