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
               Fragiles
                 211 Mytilus lithophagus Linnaeus, 1758
                 212 Mytilus bilocularis Linnaeus, 1758
                 213 Mytilus exustus Linnaeus, 1758
                 214 Mytilus barbatus Linnaeus, 1758
                 215 Mytilus edulis Linnaeus, 1758 - blue mussel
                 216 Mytilus ungulatus Linnaeus, 1758
                 217 Mytilus modiolus Linnaeus, 1758
                 218 Mytilus cygneus Linnaeus, 1758
                 219 Mytilus anatinus Linnaeus, 1758
                 220 Mytilus viridis Linnaeus, 1758
                 221 Mytilus ruber Linnaeus, 1758
                 222 Mytilus hirundo Linnaeus, 1758