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 Crocidurinae Milne-Edwards, 1872
           Genus Sylvisorex Thomas, 1904 - forest musk shrews
             Sylvisorex howelli Jenkins, 1984
               1 [Sylvisorex howelli howelli]ᵀ Jenkins, 1984
               2 Sylvisorex howelli usambarensis Hutterer, 1986