Class Mammalia Linnaeus, 1758 - mammals Subclass Theria Parker & Haswell, 1897 Order Diprotodontia Owen, 1866 Suborder Phalangeriformes Szalay, 1982 Superfamily Petauroidea Bonaparte, 1838 Family Pseudocheiridae Winge, 1893 1 Subfamily Hemibelideinae Kirsch et al., 1997 2 Subfamily Pseudocheirinae Winge, 1893 3 Subfamily Pseudochiropsinae Kirsch et al., 1997