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From Biology-Online Dictionary | Biology-Online Dictionary
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A taxonomic group comprised of egg-laying mammals monotremes and related extinct species


Class Mammalia includes the Theria and the Prototheria. Theria includes mammals in which the young are born alive whereas Prototheria includes mammals laying eggs, i.e. themonotremes

Word origin: Greek proto (first) + therion (beast) + mammal


Related term(s):