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出典:Wikipedia
出典:『Wikipedia』 (2011/06/24 02:56 UTC 版)
Metatheria is a grouping within the animal class Mammalia. First proposed by Thomas Henry Huxley in 1880, it is nearly synonymous with the earlier taxon Marsupialia (Illiger, 1811) though it is slightly wider since it also contains the nearest fossil relatives of marsupial mammals.
Metatheria