Class Mammalia Linnaeus, 1758 - mammals
   Subclass Theria Parker & Haswell, 1897
     Order Soricomorpha Gregory, 1910 see Suborder Soricomorpha Gregory, 1910
       Family Soricidae Fischer, 1814 - shrews
         Subfamily Soricinae Fischer, 1814
           Tribe Notiosoricini Reumer, 1984
             1 Genus †Hesperosorex Hibbard, 1957
             2 Genus †Beckiasorex Dalquest, 1972
             3 Genus Megasorex Hibbard, 1950 - giant Mexican shrew
             4 Genus Notiosorex Baird, 1877 - gray shrews