Mammalia - Artiodactyla - Protoceratidae
Parent taxon: Protoceratidae according to S. D. Webb et al. 2003
See also Hay 1902, Matthew 1908, Prothero 1998, Prothero and Ludtke 2007 and Webb 1981
Sister taxa: Calops, Heteromeryx, Leptoreodon, Leptotragulinae, Leptotragulus, Poabromylus, Pseudoprotoceras, Synthetoceratinae, Toromeryx, Trigenicus
Subtaxa: Paratoceras Protoceras
Type: Protoceras
Ecology: ground dwelling browser
Distribution:
• Miocene of Mexico (2 collections), Panama (7), United States (4: Texas)
• Harrisonian of United States (1: Wyoming)
• Arikareean of Panama (1), United States (1: South Dakota)
• Oligocene of Canada (4: Saskatchewan), United States (6: Nebraska, North Dakota, South Dakota)
Total: 26 collections each including a single occurrence