Class Mammalia Linnaeus, 1758 - mammals
   Order Marsupialia Jameson, 1818 - marsupials see Cohort Marsupialia Jameson, 1818
     Family Petauridae Bonaparte, 1838 - gliding, ring-tailed, and striped possums
       Genus Pseudocheirus Ogilby, 1837 - ring-tailed possums
         Subgenus Pseudocheirus (Ogilby, 1837) see Genus Pseudocheirus Ogilby, 1837
           1 Pseudocheirus canescens (Waterhouse, 1846) - lowland ringtail see Pseudochirulus canescens (Waterhouse, 1846)
           2 Pseudocheirus mayeri (Rothschild & Dollman, 1932) - pygmy ringtail see Pseudochirulus mayeri (Rothschild & Dollman, 1932)
           3 Pseudocheirus caroli (Thomas, 1921) - Weyland ringtail see Pseudochirulus caroli (Thomas, 1921)
           4 Pseudocheirus schlegeli (Jentink, 1884) - Arfak ringtail see Pseudochirulus schlegeli (Jentink, 1884)
           5 Pseudocheirus forbesi (Thomas, 1887) - moss-forest ringtail see Pseudochirulus forbesi (Thomas, 1887)
           6 Pseudocheirus peregrinus (Boddaert, 1785) - common ringtail possum
           7 Pseudocheirus herbertensis (Collett, 1884) - Herbert River ringtail see Pseudochirulus herbertensis (Collett, 1884)