organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Eukaryota Chatton, 1925 - eukaryotes see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Deuterostomia Grobben, 1908 - deuterostomes see Infrakingdom Deuterostomia Grobben, 1908
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             Superclass Tetrapoda Goodrich, 1930 - tetrapods see Clade Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988]
               Class Mammalia Linnaeus, 1758 - mammals
                 Subclass Theria Parker & Haswell, 1897
                   Infraclass Eutheria Gill, 1872
                     Superorder Archonta Gregory, 1910 see Grandorder Archonta Gregory, 1910
                       Order Scandentia Wagner, 1855 - tree shrews
                         Family Tupaiidae Gray, 1825 - tree shrews
                           Subfamily Ptilocercinae Lyon, 1913 see Family Ptilocercidae Lyon, 1913
                             Genus Ptilocercus Gray, 1848 - pen-tailed tree shrew, feather-tailed tree shrew