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 monticolus Merriam, 1890 - dusky shrew
                     01 [Sorex monticolus monticolus]ᵀ Merriam, 1890
                     02 Sorex monticolus alascensis Merriam, 1895
                     03 Sorex monticolus calvertensis Cowan, 1941
                     04 Sorex monticolus elassodon Osgood, 1901
                     05 Sorex monticolus insularis Cowan, 1941
                     06 Sorex monticolus isolatus Jackson, 1922
                     07 Sorex monticolus longicaudus Merriam, 1895
                     08 Sorex monticolus malitiosus Jackson, 1919
                     09 Sorex monticolus obscurus Merriam, 1891
                     10 Sorex monticolus parvidens Jackson, 1921
                     11 Sorex monticolus prevostensis Osgood, 1901
                     12 Sorex monticolus setosus Elliot, 1899
                     13 Sorex monticolus shumaginensis Merriam, 1900
                     14 Sorex monticolus soperi Anderson & Rand, 1945