Class Mammalia Linnaeus, 1758 - mammals "Eupantotheria" Kermack & Mussett, 1958, incertae sedis [paraphyletic] Superorder †Dryolestoidea Butler, 1939 Order †Amphitheriida Prothero, 1981 [monotypic] Family †Amphitheriidae Owen, 1846 [monotypic] Genus †Amphitherium Blainville, 1838 †Amphitherium rixoni Butler & Clemens, 2001 see Amphitherium prevostii (Mayer, 1832)