<==o †MERIDIUNGULATA (eteläamerikan ungulaatit)
   |?- †Andinodus
   |?- †Anagonia
   |?- †Lambdaconus
   |?- †Prostylophorus
   |?- †Trilobodon
   |?- †Heterolophodon
   |?- †Acamana
   |?- †Perutherium [Perutheriidae]
   |?-o †Amilnedwardsiidae
   |  |-- †Amilnedwardsia
   |  `-- †Rutimeyeria
   |?- †Didolodontidae
   `--+-- †LITOPTERNA
      |?-+--o †XENUNGULATA
      |  |  `-- †Carodniidae
      |  `?-o †PYROTHERIA
      |     `-- †Pyrotheriidae [+Colombitheriidae]
      |?-o †ASTRAPOTHERIA
      |  |-- †Eoastrapotheriidae
      |  |-- †Trigonostylopidae
      |  `-- †Astrapotheriidae
      `--o †NOTOUNGULATA
         |--o †NOTIOPRONGONIA
         |  |-- †Henricosborniidae
         |  `-- †Notostylopidae
         |--o †TOXODONTIA
         |  |-- †Isotemnidae
         |  |-- †Leontiniidae
         |  |-- †Notohippidae
         |  |-- †Toxodontidae
         |  `-- †Homalodotheriidae
         |--o †TYPOTHERIA
         |  |-- †Oldfieldthomasiidae
         |  |-- †Archaeopithecidae
         |  `-- †Interatheriidae
         `--o †HEGETOTHEROIDEA
            |-- †Archaeohyracidae
            |?- †Mesotheriidae [may not belong here]
            `-- †Hegetotheriidae


Reference(s):

Carroll, R. L., 1988: Vertebrate paleontology and evolution.

–W. H. Freeman and company, New York, 1988, 698

Carroll, R. L., 1988: Appendix. 594-648

in Carroll, R. L., 1988: Vertebrate paleontology and evolution.

–W. H. Freeman and company, New York, 1988, 698