After Evander, 1989, Hulbert, 1989, Prothero & Shubin, 1989 and Froehlich, 2002

<==o Equinae Gray, 1821 [non Leidy, 1869, Steinmann & Döderlein, 1890] (true horses; varsinaiset hevoset)
   |--o †Kalobatippus Osborn, 1915 [Kalibatibbus]
   |  |-- †K. agatensis
   |  `-- †K. praestans
   `--+--o †Archaeohippus Gidley, 1906
      |  |-- †A. penultimus (Matthew, 1924)
      |  |-- †A. blackbergi (Hay, 1924) [A. minutalis]
      |  |-- †A. ultimus (Cope, 1886)
      |  |-- †A. mourningi (Merriam, 1913)
      |  `-- †A. mannulus O'Sullivan, 2003
      `--o †“Parahippus” Leidy, 1858 [paraphyletic]
         |?- †“Parahippus” pristinus
         |-- †“Parahippus” pawniensis
         |-- †“Parahippus” leonensis
         `--o †“Merychippus” Leidy, 1857 [paraphyletic]
            |-- †“Merychippus” gunteri
            `--+-- †“Merychippus” primus
               `--+-- †Hippotheriini Bonaparte, 1850 [Hipparionini Quinn, 1955] (hipparions; Hipparion-hevoset)
                  `--o Equini Gray, 1921 [non Gidley, 1907] sensu McKenna & Bell, 1997 (true horses; varsinaiset hevoset)
                     |--+-- †“Merychippus” intermontanus
                     |  `-- †Protohippini Gidley, 1907
                     `--+-- †“Merychippus” stylodontus
                        `--+-- †“Merychippus” carrizoensis
                           `-- Equini Gray, 1921 [non Gidley, 1907] (horses; varsinaiset hevoset)

Reference(s):