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 Sylvilagus Gray, 1867
             Sylvilagus nuttallii (Bachman, 1837) - Nuttall's cottontail
               Sylvilagus nuttallii pinetis (J. Allen, 1894)