Systema naturæ - nature
   Universum - universe see [unranked] Mundus Plinius
     naturalia - natural bodies
       Regnum Animale nom. inval. - animal kingdom see Kingdom Animalia Linnaeus, 1758
         Class Quadrupedia nom. inval. - quadrupeds see Class Mammalia Linnaeus, 1758
           Order Ferae nom. inval. see Order Ferae Linnaeus, 1758
             Genus Didelphis nom. inval. see Genus Didelphis Linnaeus, 1758
               Possum nom. inval. see Philander nom. inval.