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 thorace laevi
                   42 Cancer gammarus Linnaeus, 1758
                   43 Cancer astacus Linnaeus, 1758
                   44 Cancer carcinus Linnaeus, 1758
                   45 Cancer pennaceus Linnaeus, 1758
                   46 Cancer squilla Linnaeus, 1758
                   47 Cancer crangon Linnaeus, 1758 see Crangon crangon (C. Linnaeus, 1758)