Class Mammalia Linnaeus, 1758 - mammals Order †Eutriconodonta Kermack, Mussett & Rigney, 1973, incertae sedis Family †"Amphilestidae" Osborn, 1888 [paraphyletic] Genus †Liaotherium Zhou, Cheng & Wang, 1991 [monotypic] 1 †Liaotherium gracile Zhou, Cheng & Wang, 1991