prototherian

English Thesaurus

1. primitive oviparous mammals found only in Australia and Tasmania and New Guinea (noun.animal)

hypernym	:	mammal, mammalian,
definition	:	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 (noun.animal)

hyponym	:	egg-laying mammal, monotreme,
definition	:	the most primitive mammals comprising the only extant members of the subclass Prototheria (noun.animal)