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 Mytilus Linnaeus, 1758
               Parasitici, unguibus affixi
                 206 Mytilus crista galli Linnaeus, 1758
                 207 Mytilus hyotis Linnaeus, 1758
                 208 Mytilus frons Linnaeus, 1758