Class Mammalia Linnaeus, 1758 - mammals
   Subclass Theria Parker & Haswell, 1897
     Order Paucituberculata Ameghino, 1894
       Family Caenolestidae Trouessart, 1898 - "shrew" opossums
         1 Genus Caenolestes Thomas, 1895 - common "shrew" opossums
         2 Genus Lestoros Oehser, 1934
         3 Genus Rhyncholestes Osgood, 1924 - Chilean "shrew" opossums