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 Insecta Linnaeus, 1758 - insects
           Order Aptera Linnaeus, 1758
             Genus Cancer Linnaeus, 1758 - cancer crab
               Macrouri Linnaeus, 1758
                 Macrouri, manibus adactylis, thorace oblongo
                   52 Cancer homarus Linnaeus, 1758
                   53 Cancer arctus Linnaeus, 1758