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单词 instar
释义

Definition of instar in English:

instar

noun ˈɪnstɑːˈinstär
Zoology
  • A phase between two periods of moulting in the development of an insect larva or other invertebrate animal.

    〔动〕(昆虫等无脊椎动物的)龄期

    Example sentencesExamples
    • When the eggs hatch, the caterpillar enters the first instar (stage of development).
    • At the end of the third instar, the larva wriggles out of its warble, falls to the ground, and burrows into the soil to pupate.
    • The larval stage consists of four phases, or instars, with a complete molt between each instar.
    • The life cycle of most metamorphic insects includes several sequential larval instars followed by a molt to a pupa, and then a final molt to the adult.
    • After the second moult, larvae preyed only on the first-instar nymphs of Libyaspis, while the larvae of later instars preyed on nymphs of a wide range of sizes.

Origin

Late 19th century: from Latin, literally 'form, likeness'.

Definition of instar in US English:

instar

nounˈinstär
Zoology
  • A phase between two periods of molting in the development of an insect larva or other invertebrate animal.

    〔动〕(昆虫等无脊椎动物的)龄期

    Example sentencesExamples
    • The life cycle of most metamorphic insects includes several sequential larval instars followed by a molt to a pupa, and then a final molt to the adult.
    • At the end of the third instar, the larva wriggles out of its warble, falls to the ground, and burrows into the soil to pupate.
    • After the second moult, larvae preyed only on the first-instar nymphs of Libyaspis, while the larvae of later instars preyed on nymphs of a wide range of sizes.
    • When the eggs hatch, the caterpillar enters the first instar (stage of development).
    • The larval stage consists of four phases, or instars, with a complete molt between each instar.

Origin

Late 19th century: from Latin, literally ‘form, likeness’.

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更新时间:2024/12/27 15:33:11