Class Mammalia Linnaeus, 1758 - mammals
   Order Diprotodontia Owen, 1866
     Family Pseudocheiridae Winge, 1893
       Genus Pseudocheirus Ogilby, 1837 - ring-tailed possums
         1 Pseudocheirus canescens (Waterhouse, 1846) - lowland ringtail see Pseudochirulus canescens (Waterhouse, 1846)
         2 Pseudocheirus caroli (Thomas, 1921) - Weyland ringtail see Pseudochirulus caroli (Thomas, 1921)
         3 Pseudocheirus forbesi (Thomas, 1887) - moss-forest ringtail see Pseudochirulus forbesi (Thomas, 1887)
         4 Pseudocheirus herbertensis (Collett, 1884) - Herbert River ringtail see Pseudochirulus herbertensis (Collett, 1884)
         5 Pseudocheirus mayeri (Rothschild & Dollman, 1932) - pygmy ringtail see Pseudochirulus mayeri (Rothschild & Dollman, 1932)
         6 Pseudocheirus peregrinus (Boddaert, 1785) - common ringtail possum
         7 Pseudocheirus schlegeli (Jentink, 1884) - Arfak ringtail see Pseudochirulus schlegeli (Jentink, 1884)