Class Mammalia Linnaeus, 1758 - mammals
   Subclass Boreosphenida Luo, Cifelli & Kielan-Jaworowska, 2001 - tribotherians see Clade Boreosphenida Luo, Cifelli & Kielan-Jaworowska 2001
     01 Order †Aegialodontia Butler, 1978 [monotypic]
     02 Family †Kermackiidae Butler, 1978, incertae sedis
     03 Family †Pappotheriidae Slaughter, 1965, incertae sedis [monotypic]
     04 Family †Holoclemensiidae Aplin & Archer, 1987, incertae sedis [monotypic]
     05 Genus †Hypomylos Sigogneau-Russell, 1992, incertae sedis
     06 Genus †Slaughteria Butler, 1978, incertae sedis [monotypic] see Genus Pappotherium Slaughter, 1965
     07 Genus †Tribotherium Sigogneau-Russell, 1991, incertae sedis [monotypic]
     08 Family †Picopsidae Fox, 1980, incertae sedis
     09 Genus †Falepetrus Clemens & Lillegraven, 1986, incertae sedis [monotypic]
     10 Genus †Palaeomolops Averianov & Archibald, 2003, orth. inval., incertae sedis [monotypic] see Genus Paleomolops Cifelli, 1994
     11 Genus †Potamotelses Fox, 1972, incertae sedis [monotypic]
     12 Genus †Zygiocuspis Cifelli, 1990, incertae sedis [monotypic]
     13 Infraclass Metatheria Huxley, 1880
     14 Infraclass Eutheria Gill, 1872