Phylum [Vertebrata] Lamarck, 1801 see Infraphylum 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