Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             Class Mammalia Linnaeus, 1758 - mammals
               Subclass Eutheria Gill, 1872 see Infraclass Eutheria Gill, 1872
                 Order Insectivora Bowdich, 1821 - insectivores see Superorder Insectivora Bowdich, 1821
                   Superfamily Soricoidea Fischer, 1814
                     Family Soricidae Fischer, 1814 - shrews
                       Subfamily Soricinae Fischer, 1814
                         Genus Notiosorex Baird, 1877 - gray shrews
                           Notiosorex gigas Merriam, 1897 - giant Mexican shrew see Megasorex gigas (Merriam, 1897)