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 Subfamily Pseudocheirinae Winge, 1893 Genus Pseudocheirus Ogilby, 1837 - ring-tailed possums 1 Pseudocheirus peregrinus (Boddaert, 1785) - common ringtail possum