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
               Brachyuri Linnaeus, 1758
                 a Brachyuri Thorace laevi lateribus integerrimo
                 b Brachyuri thorace laevi lateribus inciso
                 c Brachyuri thorace hirto
                 d Brachyuri thorace supra spinoso
                 e Brachyuri thorace inaequali