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
               Plani s. compressi ut plani appareant & subauriti
                 209 Mytilus margaritiferus Linnaeus, 1758
                 210 Mytilus unguis Linnaeus, 1758