Class Mammalia Linnaeus, 1758 - mammals Subclass Theria Parker & Haswell, 1897 Infraclass Metatheria Huxley, 1880 Order Marsupialia Jameson, 1818 - marsupials see Cohort Marsupialia Jameson, 1818 Superfamily Caenolestoidea Trouessart, 1898 Family Caenolestidae Trouessart, 1898 - "shrew" opossums