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单词 cephalon
释义

Definition of cephalon in English:

cephalon

noun ˈkɛfəlɒnˈsɛfəlɒn-lən
Zoology
  • (in some arthropods, especially trilobites) the region of the head, composed of fused segments.

    〔动〕(某些节肢动物,尤指三叶虫的)头部

    Example sentencesExamples
    • This specimen cannot be specifically identified because it lacks the cephalon and first thoracic segment.
    • I assume that, as in Phacops and older trilobites, the cephalon bore one pair of antennae and three pairs of biramous limbs, and each thoracic segment a pair of limbs.
    • Members of the Agnostina have only two segments between the cephalon and pygidium, and never have cephalic sutures.
    • The anteriormost region was the cephalon and was constructed from segments that were commonly demarcated by lateral furrows in the glabella (the stomach capsule), but which were fused together.
    • This problem is reflected in the ongoing uncertainty about the number of biramous appendages in the trilobite cephalon.

Origin

Late 19th century: from Greek kephalē 'head'.

Definition of cephalon in US English:

cephalon

noun-lən
Zoology
  • (in some arthropods, especially trilobites) the region of the head, composed of fused segments.

    〔动〕(某些节肢动物,尤指三叶虫的)头部

    Example sentencesExamples
    • Members of the Agnostina have only two segments between the cephalon and pygidium, and never have cephalic sutures.
    • The anteriormost region was the cephalon and was constructed from segments that were commonly demarcated by lateral furrows in the glabella (the stomach capsule), but which were fused together.
    • I assume that, as in Phacops and older trilobites, the cephalon bore one pair of antennae and three pairs of biramous limbs, and each thoracic segment a pair of limbs.
    • This problem is reflected in the ongoing uncertainty about the number of biramous appendages in the trilobite cephalon.
    • This specimen cannot be specifically identified because it lacks the cephalon and first thoracic segment.

Origin

Late 19th century: from Greek kephalē ‘head’.

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更新时间:2024/9/21 13:38:17