Proboscidea Owen 1859 see Order Proboscidea Owen, 1859
   Elephantoidea see Suborder Elephantoidea Osborn, 1921
     Family Elephantidae Gray, 1821 - elephants
       Subfamily Elephantinae Gray, 1821
         Genus ‡Mammuthus Brookes, 1828 - mammoths
           1.1 †Mammuthus rumanus (Ştefănescu, 1924)
           1.2 †Mammuthus meridionalis (Nesti, 1825) - southern mammoth
           1.3 †Mammuthus trogontherii (Pohlig, 1885) - steppe mammoth
           1.4 ‡Mammuthus primigenius (Blumenbach, 1799) - woolly mammoth
           2.1 †"Mammuthus hayi" (Barbour, 1915)
           2.2 †Mammuthus imperator (Leidy, 1858) - imperial mammoth
           2.3 †Mammuthus columbi (Falconer, 1857) - Columbian mammoth