Class Mammalia Linnaeus, 1758 - mammals
   Subclass Theria Parker & Haswell, 1897
     Order Lagomorpha Brandt, 1855 - lagomorphs
       Family Leporidae Batsch, 1788 - hares and rabbits
         Genus Sylvilagus Gray, 1867 - cottontails
           Subgenus Tapeti Gray, 1867
             Sylvilagus aquaticus (Bachman, 1837) - swamp rabbit
               1 [Sylvilagus aquaticus aquaticus]ᵀ (Bachman, 1837)
               2 Sylvilagus aquaticus littoralis Nelson, 1909