Class Mammalia Linnaeus, 1758 - mammals
   Order Proboscidea Owen, 1859 - elephants
     Family Elephantidae Gray, 1821 - elephants
       Subfamily Elephantinae Gray, 1821
         Genus ‡Mammuthus Brookes, 1828 - mammoths
           1 †Mammuthus rumanus (Ştefănescu, 1924)
           1.n †Mammuthus meridionalis (Nesti, 1825) - southern mammoth
           1.n.n.1 †Mammuthus trogontherii (Pohlig, 1885) - steppe mammoth
           1.n.n.1.n ‡Mammuthus primigeniusᵀ (Blumenbach, 1799) - woolly mammoth
           1.n.n.2 †Mammuthus imperator (Leidy, 1858) - imperial mammoth
           1.n.n.2.n †Mammuthus columbi (Falconer, 1857) - Columbian mammoth