Class Mammalia Linnaeus, 1758 - mammals
Subclass Theria Parker & Haswell, 1897
Order Artiodactyla Owen, 1848 - even-toed ungulates
see Order Cetartiodactyla Montgelard, Catzeflis & Douzery, 1997
Family Cervidae Batsch, 1788 - deer
Subfamily Capreolinae Brookes, 1828
Genus Odocoileus Rafinesque, 1832 - white-tailed deer and mule deer
Odocoileus hemionus (Rafinesque, 1817) - mule deer
Odocoileus hemionus californicus Caton, 1876