Theria

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Theria ( or ; from Ancient Greek θηρίον, thēríon 'wild beast') is a subclass of mammals amongst the Theriiformes. Theria contains the eutherians (which includes placental mammals) and the metatherians (which includes marsupials) but excludes the egg-laying monotremes and various extinct mammals evolving prior to the common ancestor of placentals and marsupials.

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