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 palustris Richardson, 1828 - American water shrew
                     1 [Sorex palustris palustris]ᵀ Richardson, 1828
                     2 Sorex palustris albibarbis (Cope, 1862)
                     3 Sorex palustris brooksi Anderson, 1934
                     4 Sorex palustris gloveralleni Jackson, 1926
                     5 Sorex palustris hydrobadistes Jackson, 1926
                     6 Sorex palustris labradorensis Burt, 1938
                     7 Sorex palustris navigator (Baird, 1858)
                     8 Sorex palustris punctulatus Hooper, 1942
                     9 Sorex palustris turneri Johnson, 1951