Class Mammalia Linnaeus, 1758 - mammals Subclass Theria Parker & Haswell, 1897 Order Paucituberculata Ameghino, 1894 Family Caenolestidae Trouessart, 1898 - "shrew" opossums Genus Caenolestes Thomas, 1895 - common "shrew" opossums Caenolestes caniventer Anthony, 1921