Class Mammalia Linnaeus, 1758 - mammals
Subclass Boreosphenida Luo, Cifelli & Kielan-Jaworowska, 2001 - tribotherians
see Clade Boreosphenida Luo, Cifelli & Kielan-Jaworowska 2001
Infraclass Eutheria Gill, 1872
Magnorder Epitheria McKenna, 1975
see Cohort Placentalia Owen, 1837
Superorder Ungulatomorpha Archibald, 1996
Order †"Condylarthra" Cope, 1881 [paraphyletic]
Family †"Arctocyonidae" Giebel, 1855 [monophyletic?]
Genus †Oxyprimus Van Valen, 1978
†Oxyprimus erikseniᵀ Van Valen, 1978