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 Vermes Linnaeus, 1758 - worms see Phylum Vermes (C. Linnaeus, 1758)
           Order Mollusca Linnaeus, 1758 see Phylum Mollusca Linnaeus, 1758
             Genus Echinus Linnaeus, 1758
               Irregulares: apertura ani subtus uti os
                 12 Echinus spatagus Linnaeus, 1758
                 13 Echinus lacunosus Linnaeus, 1758
                 14 Echinus rosaceus Linnaeus, 1758
                 15 Echinus reticulatus Linnaeus, 1758
                 16 Echinus placenta Linnaeus, 1758
                 17 Echinus orbiculus Linnaeus, 1758