Class Mammalia Linnaeus, 1758 - mammals
   Subclass Theria Parker & Haswell, 1897
     Order Primates Linnaeus, 1758 - primates
       Suborder Strepsirrhini Geoffroy Saint-Hilaire, 1812
         Infraorder Lemuriformes Gregory, 1915
           Superfamily Lemuroidea Gray, 1821
             Family Lemuridae Gray, 1821 - large lemurs
               Genus Hapalemur Geoffroy Saint-Hilaire, 1851 - gentle lemurs
                 Hapalemur occidentalis Rumpler, in Tattersall & Sussman, eds., 1975