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
             01 Sylvilagus audubonii (Baird, 1858) - desert cottontail
             02 Sylvilagus cognatus Nelson, 1907
             03 Sylvilagus cunicularius (Waterhouse, 1848) - Mexican cottontail
             04 Sylvilagus floridanus (Allen, 1890) - eastern cottontail
             05 Sylvilagus graysoni (Allen, 1877) - Tres Marias cottontail
             07 Sylvilagus nuttallii (Bachman, 1837) - Nuttall's cottontail
             08 Sylvilagus obscurus Chapman, Cramer, Deppenaar & Robinson, 1992 - Appalachian cottontail
             09 Sylvilagus robustus (Bailey, 1905) - Davis Mountain cottontail
             10 Sylvilagus transitionalis (Bangs, 1895) - New England cottontail