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 Testacea Linnaeus, 1758
             Genus Arca Linnaeus, 1758
               Margine crenato; Natibus inflexis
                 149 Arca undata Linnaeus, 1758
                 150 Arca pectunculus Linnaeus, 1758
                 151 Arca glycymeris Linnaeus, 1758
                 152 Arca nummaria Linnaeus, 1758
                 153 Arca nucleus Linnaeus, 1758