Phylum Chordata Bateson, 1885 - chordates
   Subphylum Vertebrata Cuvier, 1812 - vertebrates
     Class Mammalia Linnaeus, 1758 - mammals
       Order Marsupialia Jameson, 1818 - marsupials see Cohort Marsupialia Jameson, 1818
         Family †Argyrolagidae Ameghino, 1904
         Family †Bonapartheriidae Pascual, 1980
         Family †Borhyaenidae Ameghino, 1894
         Family Burramyidae Broom, 1898 - pygmy possums
         Family Caenolestidae Trouessart, 1898 - "shrew" opossums
         Family Dasyuridae Goldfuss, 1820 - marsupial "mice" and "cats", and Tasmanian devil
         Family Didelphidae Gray, 1821 - American opossums
         Family †Diprotodontidae Gill, 1872
         Family †Ektopodontidae Stirton, Tedford & Woodburne, 1967
         Family †Groeberiidae Patterson, 1952
         Family †Ilariidae Tedford & Woodburne, 1987
         Family Macropodidae Gray, 1821 - wallabies and kangaroos
         Family †Mayulestidae de Muizon, 1994
         Family Microbiotheriidae Ameghino, 1887
         Family †Miralinidae Woodburne, Pledge & Archer, 1987
         Family Myrmecobiidae Waterhouse, 1841
         Family †Necrolestidae Ameghino, 1894
         Family Notoryctidae Ogilby, 1892
         Family †Palorchestidae Tate, 1948
         Family †Patagoniidae Pascual & Carlini, 1987
         Family †Pediomyidae Simpson, 1927
         Family Peramelidae Gray, 1825 - bandicoots
         Family Petauridae Bonaparte, 1838 - gliding, ring-tailed, and striped possums
         Family Phalangeridae Thomas, 1888 - possums and cuscuses
         Family Phascolarctidae Owen, 1839
         Family †Pilkipildridae Archer, Tedford & Rich, 1987
         Family †Polydolopidae Ameghino, 1897
         Family †Stagodontidae Marsh, 1889
         Family Tarsipedidae Gervais & Verreaux, 1842
         Family ‡Thylacinidae Bonaparte, 1838
         Family †Thylacoleonidae Gill, 1872
         Family Thylacomyidae Bensley, 1903 - rabbit-bandicoots
         Family †Thylacosmilidae Riggs, 1933
         Family Vombatidae Burnett, 1830 - wombats
         Family †Wynyardiidae Osgood, 1921
         Family †Yalkaparidontidae Archer, Hand & Godthelp, 1988