Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       Astra Plinius - celestial bodies
         Universe
           (Supercluster) Virgo-Hydra-Centaurus Supercluster
             (Supercluster) Virgo Supercluster
               (Cluster) Local Group
                 (Galaxy) Milky Way Galaxy veter.
                   (Spiral arm) Orion Arm
                     (Region) Local Bubble
                       Local Interstellar Cloud
                         (Planetary system) Solar System
                           (Planet-satellite system) Earth System
                             (Planet) Earth veter.
                               "spheres" (Earth)
                                 (Sphere) Biosphere (Earth) - zone of life
                                   "terrestrial and freshwater ecoregions"
                                     (Biogeographic realm) Antarctic
                                       (Terrestrial ecoregion) Marielandia Antarctic tundra (Antarctic)
                                       (Terrestrial ecoregion) Maudlandia Antarctic desert (Antarctic)
                                       (Terrestrial ecoregion) Scotia Sea Islands tundra (Antarctic)
                                       (Terrestrial ecoregion) Southern Indian Ocean Islands tundra (Antarctic)