Synonym: Arctocyonia Van Valen 1969
Parent taxon: Ungulata according to M. C. McKenna and D. L. Lofgren 2003
See also Eberle 2003, McKenna 1975 and McKenna and Bell 1997
Sister taxa: Artiodactylamorpha, Panperissodactyla, Altungulata, Mesodactyli, Tesserachenae, Trichenae, Hydrophorae, Haloboidea, Monochenae, Diplarthra, Cetungulata, Polydactyli, Barytheria, Amblypoda, Sivatheridae, Ruminantes, Tipotheria, Capridae, Ganungulatum, Barypoda, Protungulata, Antilopidae, Palaeocladosictis, Kharmerungulatum, Hyraces
Subtaxa: Arctocyonidae Prolatidens Quettacyonidae
Ecology: scansorial insectivore
Distribution:
• Eocene of Belgium (2 collections), Canada (1: Northwest Territories), China (1), France (1), India (1), Pakistan (6), the United Kingdom (5), United States (142: Colorado, New Mexico, Wyoming)
• Cf2 of United States (1: Wyoming)
• Clarkforkian of United States (47: Colorado, Montana, Wyoming)
• Paleocene of Belgium (2), Canada (25: Alberta, Saskatchewan), France (5), Germany (1), Morocco (2), the United Kingdom (1), United States (330: California, Colorado, Maryland, Montana, New Mexico, North Dakota, Texas, Utah, Wyoming)
• Cretaceous of United States (4: Montana, Wyoming)
Total: 577 collections including 907 occurrences