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 Sorex Linnaeus, 1758
                 Sorex arcticus group
                   Sorex arcticus Kerr, 1792 - Arctic shrew
                     1 [Sorex arcticus arcticus]ᵀ Kerr, 1792
                     2 Sorex arcticus laricorum Jackson, 1925