prototherian

Noun
  1. Primitive oviparous mammals found only in Australia and Tasmania and New Guinea (synset 101874184)
    is a type of: mammal, mammalian - any warm-blooded vertebrate having the skin more or less covered with hair; young are born alive except for the small subclass of monotremes and nourished with milk
    subtypes: egg-laying mammal, monotreme - the most primitive mammals comprising the only extant members of the subclass Prototheria

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