Phylum [Vertebrata] (Lamarck, 1801) Class Mammalia Linnaeus, 1758 - mammals Subclass Theria Parker & Haswell, 1897 Infraclass Eutheria Gill, 1872 Cohort Epitheria McKenna, 1975 Superorder Tethytheria McKenna, 1975 Order Sirenia Gill, 1872 - sea cows