单词	prototherian
释义	prototherian /ˌprəʊtə(ʊ)ˈθɪərɪən / Zoology noun A mammal of the group Prototheria, which comprises the monotremes and their extinct relatives.Extant mammals, including prototherians (egg-laying mammals) and therians (marsupial and placental mammals), probably last shared a common ancestor about 160 million years ago. adjective Relating to or denoting prototherians.They had a common ancestor more recently than either had with the monotremes or, probably, any other prototherian group.... In his classification of prototherian mammals Hopson queried the allocation of Haramiyidae to the Multituberculata.
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