Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Craniata Linnaeus, 1758 see Subphylum Vertebrata Cuvier, 1812
     Class Mammalia Linnaeus, 1758 - mammals
       Subclass Theria Parker & Haswell, 1897
         Infraclass Placentalia Owen, 1837 see Cohort Placentalia Owen, 1837
           Order Scandentia Wagner, 1855 - tree shrews
             1 Family Tupaiidae Gray, 1825 - tree shrews
             2 Family Ptilocercidae Lyon, 1913