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monotremata |
3 definitions found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Monotremata \Mon`o*trem"a*ta\, n. pl [NL., fr Gr ? single + ? hole.] (Zo["o]l.) A subclass of Mammalia, having a cloaca in which the ducts of the urinary, genital, and alimentary systems terminate, as in birds. The female lays eggs like a bird. See {Duck mole}, under {Duck}, and {Echidna}. From Webster's Revised Unabridged Dictionary (1913) [web1913]: Mammalia \Mam*ma"li*a\, n. pl [NL., from L. mammalis. See {Mammal}.] (Zo["o]l.) The highest class of Vertebrata. The young are nourished for a time by milk, or an analogous fluid, secreted by the mammary glands of the mother. Note: Mammalia are divided into three subclasses; -- I. {Placentalia}. This subclass embraces all the higher orders including man. In these the fetus is attached to the uterus by a placenta. II {Marsupialia}. In these no placenta is formed, and the young, which are born at an early state of development, are carried for a time attached to the teats, and usually protected by a marsupial pouch. The opossum, kangaroo, wombat, and koala are examples. III. {Monotremata}. In this group which includes the genera {Echidna} and {Ornithorhynchus}, the female lays large eggs resembling those of a bird or lizard, and the young, which are hatched like those of birds, are nourished by a watery secretion from the imperfectly developed mamm[ae]. From WordNet r 1.6 [wn]: Monotremata n : coextensive with the subclass Prototheria [syn: {Monotremata}, {order Monotremata}]
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