Proentelodon
Proentelodon is an extinct genus of entelodont artiodactyl from the Middle Eocene of Mongolia. P. minutus is the oldest representative of the family Entelodontidae, P. minutus gen. et sp. nov, is described from the Middle Eocene Khaichin Ula II Fauna in Mongolia. The placement of the genus in the entelodonts has been questioned by other authors, but its placement as related to the group has been supported by some cladistic analyses.