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, Protungulata, Haloboidea, Kharmerungulatum, Ganungulatum, Ruminantes, Palaeocladosictis, Hyraces, Hydrophorae, Antilopidae, Diplarthra, Monochenae, Trichenae, Polydactyli, Capridae, Tesserachenae, Altungulata, Tipotheria, Sivatheridae, Mesodactyli, Amblypoda, Barytheria, Barypoda, Cetungulata
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 (46: 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: 576 collections including 906 occurrences