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 Indriidae Burnett, 1828, orth. cons. - avahi, sifakas, and indri
               1 Genus Avahi Jourdan, 1834 - avahi, woolly lemur
               2 Genus Indri Geoffroy Saint-Hilaire & Cuvier, 1796 - indri
               3 Genus Propithecus Bennett, 1832 - sifakas