Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Chordata Bateson, 1885 - chordates
     Subphylum Vertebrata Cuvier, 1812 - vertebrates
       Class Mammalia Linnaeus, 1758 - mammals
         Grandorder Archonta Gregory, 1910
           Mirorder Primatomorpha Beard, 1991
             Order †Plesiadapiformes Simons & Tattersall, 1972 see Suborder Plesiadapiformes Simons & Tattersall, 1972
               Superfamily †Plesiadapoidea Trouessart, 1897
                 Family †Paromomyidae Simpson, 1940
                   Genus †Ignacius Matthew & Granger, 1921
                     1 †Ignacius graybullianus Bown & Rose, 1976
                     2 †Ignacius frugivorus (Matthew & Granger, 1921)
                     3 †Ignacius fremontensis (Gazin, 1971)
                     4 †Ignacius mcgrewi