Metatheria

Metatheria Temporal range: Early Cretaceous–recent[1][2][3] PreꞒ Ꞓ O S D C P T J K Pg N
Lycopsis longirostris, an extinct sparassodont, a relative of the marsupials
A mouse opossum (Marmosa)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Subclass:	Theria
Clade:	Metatheria Huxley, 1880
Subgroups
†?Sinodelphys †Holoclemensia †Adinodon †Deltatheroida Marsupialiformes †Adelodelphys †Alphadontidae †Asiadelphia †Sinbadelphys †Camptomus? †Archimetatheria †Stagodontidae †Iqualadelphis †Sparassodonta †Pucadelphyidae †Herpetotheriidae †Anatoliadelphyidae †Polydolopimorphia †Peradectidae †Pediomyidae Marsupialia

Metatheria is a mammalian clade that includes all mammals more closely related to marsupials than to placentals. First proposed by Thomas Henry Huxley in 1880, it is a more inclusive group than the marsupials; it contains all marsupials as well as many extinct non-marsupial relatives. It is one of two groups placed in the clade Theria alongside Eutheria, which contains the placentals.