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 Soricini Fischer, 1814
             Genus Sorex Linnaeus, 1758 - long-tailed shrews
               Subgenus Otisorex De Kay, 1842
                 Sorex hoyi Baird, 1857 - American pygmy shrew
                   1 [Sorex hoyi hoyi]ᵀ Baird, 1857
                   2 Sorex hoyi alnorum Preble, 1902
                   3 Sorex hoyi eximius Osgood, 1901
                   4 Sorex hoyi montanus (Brown, 1966), nom. illeg.
                   5 Sorex hoyi thompsoni Baird, 1858
                   6 Sorex hoyi winnemana (Preble, 1910)