After McKenna & Bell, 1997, Luo, Cifelli & Kielan-Jaworowska, 2001 and Luo, Kielan-Jaworowska & Cifelli, 2002

<==o Boreosphenida Luo, Cifelli & Kielan-Jaworowska, 2001 [Tribosphenida McKenna, 1975]
   |?- †Hypomylos phelizoni Sigogneau-Russell, 1992
   |?- †Montanalestes keeblerorum (Cifelli RL, 1999) Cifelli RL, 2000 [Montanalestes keebleri Cifelli RL, 1999]
   |--o †Aegialodontia Butler, 1978
   |  `--o †Aegialodontidae Kermack, 1967
   |     |-- †Aegialodon dawsoni Kermack, Lees & Mussett, 1965
   |     `-- †Kielantherium gobiensis Dashzeveg, 1975
   `--o Theria Parker & Haswell, 1897 sensu lato
      |?- †Anizorhinus Ameghino, 1902 [1907?]
      |?- †Tetraprothomo Ameghino, 1907
      |?- †Tribotherium Sigogneau-Russell, 1991
      |?- †Zygiocuspis goldingi Cifelli, 1990
      |?- †Falepterus barwini Clemens & Lillegraven, 1986
      |?-o †Dakotadens Eaton, 1993
      |  |-- †D. sp. [Eaton, 1993]
      |  `-- †D. morrowi Eaton, 1993
      |?- †Aethomylos simplicidens Novacek, 1976
      |?- †Kasserinotherium tunisiense Crochet, 1986
      |?- †Paleomolops langstoni Cifelli, 1994
      |?- †Russellmys dinesae Estravis, 1990 [Russellmyinae Estravis, 1990]
      |?- †Endotherium niinomi Shikama, 1947 [Endotheriidae Shikama, 1947]
      |?- †Potamotelses aquilensis Fox, 1972 [non Nesov, 1987] [Potamotelsidae Nesov, 1987]
      |?-o †Plicatodon Ameghino, 1904 [Plicatodontidae Ameghino, 1904]
      |  |-- †P. perrarus (Ameghino, 1881) Pliocene Argentina
      |  `-- †P. sp. (Pavlow, 1892) Pleistocene  Mexico
      |?-o †Pappotheriidae Slaughter, 1965 [Pappotherida Butler, 1978]
      |  |-- †Pappotherium pattersoni Slaughter, 1965
      |  |-- †Bobolestes Nesov, 1985
      |  `-- †Slaughteria eruptens Butler, 1978
      |?-o †Kermackiidae Butler, 1978
      |  |-- †Trinictitherium slaughteri Butler, 1978
      |  `-- †Kermackia texana Slaughter, 1971
      |?-o †Picopsidae Fox, 1980
      |  |-- †Comanchea Jacobs, Winkler & Murry, 1989
      |  `-- †Picopsis pattersoni Fox, 1980
      `--o Theria sensu stricto
         |-- Metatheria Huxley, 1880 [Marsupialia sensu lato] (marsupials and relatives; pussieläimäiset nisäkkäät)
         `-- Eutheria Gill, 1872 [Placentaria sensu lato] (Placental mammals and relatives; istukkanisäkäsmäoiset nisäkkäät)

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