Phylum [Vertebrata] (Lamarck, 1801) Class Mammalia Linnaeus, 1758 - mammals Subclass Theria Parker & Haswell, 1897 Infraclass Eutheria Gill, 1872 Cohort Epitheria McKenna, 1975 Superorder Ungulata Linnaeus, 1766 Order †Embrithopoda Andrews, 1906 Family †Arsinoitheriidae Andrews, 1904