Implacentalia

noun plural
Im·​plac·​en·​ta·​lia | \(ˈ)im-ˌplas-ᵊn-ˈtā-lē-ə \

Medical Definition of Implacentalia 

in former classifications

: the monotremes and marsupials regarded as a systematic unit characterized by the absence or rudimentary development of a placenta

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