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词汇 monotreme
释义

Definition of monotreme in English:

monotreme

noun ˈmɒnə(ʊ)triːmˈmɑnəˌtrim
Zoology
  • A primitive mammal that lays large yolky eggs and has a common opening for the urogenital and digestive systems. Monotremes are now restricted to Australia and New Guinea, and comprise the platypus and the echidnas.

    〔动〕单孔目动物

    Order Monotremata and subclass Prototheria: two families

    Example sentencesExamples
    • There are only three living monotremes, the duck-billed platypus and two species of echidna, or ‘spiny anteaters’, such as the one shown at right.
    • The Australian fossil record of monotremes also includes some quite good Miocene and Pleistocene fossils of giant echidnas.
    • Placental and marsupial mammals are more closely related to one another than to the third living group of mammals, the monotremes.
    • Many of the comprehensive, algorithm-based analyses place multituberculates within the crown group of living mammals, in some cases tentatively united with monotremes.
    • Molecular evidence now suggests that the marsupials and the monotremes branched off much earlier than the placentals did and that they are therefore the closer relatives.

Origin

Mid 19th century: from mono- 'single' + Greek trēma 'hole'.

Definition of monotreme in US English:

monotreme

nounˈmɑnəˌtrimˈmänəˌtrēm
Zoology
  • A primitive mammal that lays large yolky eggs and has a common opening for the urogenital and digestive systems. Monotremes are now restricted to Australia and New Guinea, and comprise the platypus and the echidnas.

    〔动〕单孔目动物

    Order Monotremata and subclass Prototheria: two families

    Example sentencesExamples
    • There are only three living monotremes, the duck-billed platypus and two species of echidna, or ‘spiny anteaters’, such as the one shown at right.
    • Many of the comprehensive, algorithm-based analyses place multituberculates within the crown group of living mammals, in some cases tentatively united with monotremes.
    • Molecular evidence now suggests that the marsupials and the monotremes branched off much earlier than the placentals did and that they are therefore the closer relatives.
    • The Australian fossil record of monotremes also includes some quite good Miocene and Pleistocene fossils of giant echidnas.
    • Placental and marsupial mammals are more closely related to one another than to the third living group of mammals, the monotremes.

Origin

Mid 19th century: from mono- ‘single’ + Greek trēma ‘hole’.

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