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
               Regulares ano verticali
                 01 Echinus esculentus Linnaeus, 1758
                 02 Echinus globulus Linnaeus, 1758
                 03 Echinus sphaeroides Linnaeus, 1758
                 04 Echinus gratilla Linnaeus, 1758
                 05 Echinus lixula Linnaeus, 1758
                 06 Echinus saxatilis Linnaeus, 1758
                 07 Echinus diadema Linnaeus, 1758
                 08 Echinus cidaris Linnaeus, 1758
                 09 Echinus mamillatus Linnaeus, 1758
                 10 Echinus lucunter Linnaeus, 1758
                 11 Echinus atratus Linnaeus, 1758