Class Mammalia Linnaeus, 1758 - mammals
   Subclass Theria Parker & Haswell, 1897
     Order Chiroptera Blumenbach, 1779 - bats
       Family Vespertilionidae Gray, 1821 - vespertilionid bats
         Subfamily Vespertilioninae Gray, 1821
           Tribe Eptesicini Volleth & Heller, 1994
             Genus Eptesicus Rafinesque, 1820 - big brown bats
               Subgenus Eptesicus Rafinesque, 1820
                 Eptesicus fuscus (Beauvois, 1796) - big brown bat
                   Eptesicus fuscus dutertreus Gervais, 1837