Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       naturalia - natural bodies
         "crystal-kingdom"
           chemical substances
             chemical compounds
               Class isoprenoids
                 Class terpenoids
                   Class tetraterpenoids [C40 skeleton] - terpenoids having a C40 skeleton
                     Class carotenoids
                       1 Class xanthophylls