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 vagrans complex
                   Sorex pacificus Coues, 1877 - Pacific shrew
                     1 [Sorex pacificus pacificus]ᵀ Coues, 1877
                     2 Sorex pacificus cascadensis Carraway, 1990