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
                                   "marine ecoregions"
                                     1 (Biogeographic realm) Arctic
                                     2 (Region) Atlantic
                                     3 (Biogeographic realm) Temperate Southern Africa
                                     4.1 (Region) Indo-Pacific
                                     4.2 (Biogeographic realm) Temperate Australasia
                                     5 (Region) Pacific
                                     6 (Biogeographic realm) Temperate South America
                                     7 (Biogeographic realm) Southern Ocean