Class Mammalia Linnaeus, 1758 - mammals
   Subclass Theria Parker & Haswell, 1897
     Order Diprotodontia Owen, 1866
       Suborder Phalangeriformes Szalay, 1982
         Superfamily Phalangeroidea Thomas, 1888 see Suborder Phalangeriformes Szalay, 1982
           Family Phalangeridae Thomas, 1888 - possums and cuscuses
             Subfamily Phalangerinae Thomas, 1888
               Tribe Phalangerini Thomas, 1888
                 Genus Phalanger Storr, 1780 - cuscuses
                   Phalanger orientalis (Pallas, 1766) - grey cuscus
                     1 [Phalanger orientalis orientalis]ᵀ (Pallas, 1766)
                     2 Phalanger orientalis breviceps Thomas, 1888