Shenophalos, also known as Nevada Pronghorn, is an extinct genus of artiodactyl in the Antilocapridae family. It is closely related to Ottoceros peacevalleyensis. Sphenophalos was named by Merriam (1909) and assigned to Antilocapridae by Merriam (1909) and Carroll (1988); and to Antilocaprinae by Janis and Manning (1998). Sphenophalos, has been found in Nevada, Arizona and Oregon. It had a two-pronged horn which twisted sligtly.