Class Mammalia Linnaeus, 1758 - mammals
   Subclass Theria Parker & Haswell, 1897
     Order Chiroptera Blumenbach, 1779 - bats
       Family Pteropodidae Gray, 1821 - Old World fruit bats
         Genus Pteropus Brisson, 1762 - flying foxes
           Pteropus pselaphon species group
             Pteropus insularis Hombron & Jacquinot, 1842 - Truk flying fox
               1 [Pteropus insularis insularis] Hombron & Jacquinot, 1842
               2 Pteropus insularis phaeocephalus Thomas, 1882