Classification of Williamson et al. 2012

Alphadon jasoni Storer 1991
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Invalid names: Nortedelphys intermedius Case et al. 2004 [synonym]
Peradectes elegans Matthew and Granger 1921
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Invalid names: Peradectes pauli Gazin 1956 [synonym]
Or. †Deltatheroida Kielan-Jaworowska 1982
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G. †Atokatheridium Kielan-Jaworowska and Cifelli 2001
G. †Deltatheroides Gregory and Simpson 1926
G. †Nanocuris Fox et al. 2007
G. †Oklatheridium Davis et al. 2008
G. †Sulestes Nessov 1985
Metatheria Huxley 1880 [metatherian]
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G. †Adelodelphys Cifelli 2004
G. †Aenigmadelphys Cifelli and Johanson 1994
G. †Albertatherium Fox 1971
G. †Alphadon Simpson 1927
G. †Anchistodelphys Cifelli 1990
G. †Apistodon Davis 2007
G. †Asiatherium Trofimov and Szalay 1994
G. †Bistius Clemens and Lillegraven 1986
G. †Dakotadens Eaton 1993
G. †Eoalphadon Eaton 2009
G. †Glasbius Clemens 1966
G. †Hatcheritherium Case et al. 2004
Herpetotheriidae Trouessart 1879
+
G. †Copedelphys Korth 1994
G. †Ectocentrocristus Rigby, Jr. and Wolberg 1987
G. †Herpetotherium Cope 1873
G. †Thylacodon Matthew and Granger 1921
+
Thylacodon montanensis Williamson et al. 2012
Thylacodon pusillus Matthew and Granger 1921
G. †Iugomortiferum Cifelli 1990
G. †Kokopellia Cifelli 1993
G. †Nortedelphys Case et al. 2004
+
Nortedelphys jasoni Storer 1991
Peradectidae Crochet 1979
+
G. †Armintodelphys Krishtalka and Stucky 1983
G. †Maastrichtidelphys Martin et al. 2005
G. †Mimoperadectes Bown and Rose 1979
Pediomyidae Simpson 1927
+
G. †Aquiladelphis Fox 1971
G. †Iqualadelphis Fox 1987
G. †Leptalestes Davis 2007
G. †Pediomys Marsh 1889
G. †Protolambda Osborn 1898
G. †Peradectes Matthew and Granger 1921
+
Peradectes minor Clemens 2006
G. †Pucadelphys Marshall and de Muizon 1988
G. †Szalinia de Muizon and Cifelli 2001
G. †Protalphadon Cifelli 1990
G. †Roberthoffstetteria Marshall et al. 1983
G. †Sinbadelphys Cifelli 2004
Stagodontidae Marsh 1889
+
G. †Didelphodon Marsh 1889
G. †Eodelphis Matthew 1916
G. †Pariadens Cifelli and Eaton 1987
G. †Swaindelphys Johanson 1996
G. †Turgidodon Cifelli 1990
G. †Varalphadon Johanson 1996
Mimoperadectes houdei Horovitz et al. 2009
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Invalid names: Mimoperadectes sowasheensis Beard and Dawson 2009 [synonym]