Oxen Giraffes | | | Sheep Deer | | | | | | | | | \--v---/ Goats \---v---/ Musk deer Horses | | | | _Equi_ | | | | | \---v-----/ Antelopes | | Camels | | | \----v-----/ and Lamas Intermediate horses | | Deer-shaped _Tylopoda_ _Hippariones_ \-----v------/ _Elaphia_ | | Hollow-horned | | | _Cavicornia_ | | | | | | | | | | Primæval horses \-------v--------/ | _Anchitherida_ Primæval deer | | _Dremotherida_ | | | | =Single Hoofers= | | +Solidungula+ \--v------------------/ | =Ruminating Animals= | +Ruminantia+ | Sea-oxen | Tapirs | _Sirenia_ | _Tapirida_ | | River-horses | | Lama-tapirs | | _Obesa_ | | _Macrauchenida_| | | | | | | | | Pigs | | | | \----v-----/ _Setigera_ | \--------------v--/ | | | | | | | | | Rhinoceros-horses | | | | | _Elasmotherida_ | | | | | | | | \------v-------/ | | | | Primæval pigs | Rhinoceruses | | | _Anthracotherida_ | _Nasicornia_ | \---v-----/ | | | | | | Primæval ruminants | | | | _Xiphodontia_ \---v---/ | | | | | | | | | \------v------/ \--------v--------/ =Primary Pair-hoofs= =Primary Odd-hoofs= +Anoplotherida+ +Palæotherida+ | |