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
           Quadrupedia Linnaeus, 1758 see Class Mammalia Linnaeus, 1758
             Order Primates Linnaeus, 1758 - primates
               Genus Homo Linnaeus, 1758 - people
                 Homo Sapiens Linnaeus, 1758 - human
                   Homo Sapiens Afer Linnaeus, 1758 - africans see Negroid