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词汇 hemichordate
释义

Definition of hemichordate in English:

hemichordate

noun hɛmɪˈkɔːdeɪtˌhemiˈkôrdāt
Zoology
  • A marine invertebrate of the phylum Hemichordata; an acorn worm.

    Example sentencesExamples
    • Molecular phylogenies have suggested that hemichordates are in fact a sister lineage to the echinoderms.
    • Unfortunately, a change in the genetic code of the mitochondrial genome in both enteropneusts and echinoderms strongly rejects chordate affinities of the hemichordates.
    • Size comparisons between living and extinct hemichordate zooids are not conclusive evidence, however, as it is easy to imagine a small, hypothetical, zooid that possessed multiple tentaculated arms.
    • The molecular phylogeny does agree in one respect with the morphological one in that there are close similarities between the larvae of hemichordates (acorn worms and pterobranchs) and some echinoderms.
    • We chordates are deuterostomes, as are echinoderms, some marine worms called hemichordates, and the urochordates, or sea squirts.
adjective hɛmɪˈkɔːdeɪtˌhemiˈkôrdāt
Zoology
  • Relating to or denoting hemichordates.

    Example sentencesExamples
    • Evidence for the hemichordate affinity of the extinct graptolites has been steadily amassing.
    • They lack two others, the notochord and post-anal tail, hence the name hemichordate.
    • The hemichordate sequences always contained considerable support for both hypotheses.
    • Unfortunately there are no living fenestrate hemichordate species.
    • There are two classes of hemichordate, the pterobranchs and the enteropneusts, which differ greatly in appearance and lifestyle.

Definition of hemichordate in US English:

hemichordate

nounˌhemiˈkôrdāt
Zoology
  • A marine invertebrate of the phylum Hemichordata; an acorn worm.

    Example sentencesExamples
    • Unfortunately, a change in the genetic code of the mitochondrial genome in both enteropneusts and echinoderms strongly rejects chordate affinities of the hemichordates.
    • We chordates are deuterostomes, as are echinoderms, some marine worms called hemichordates, and the urochordates, or sea squirts.
    • The molecular phylogeny does agree in one respect with the morphological one in that there are close similarities between the larvae of hemichordates (acorn worms and pterobranchs) and some echinoderms.
    • Molecular phylogenies have suggested that hemichordates are in fact a sister lineage to the echinoderms.
    • Size comparisons between living and extinct hemichordate zooids are not conclusive evidence, however, as it is easy to imagine a small, hypothetical, zooid that possessed multiple tentaculated arms.
adjectiveˌhemiˈkôrdāt
Zoology
  • Relating to or denoting hemichordates.

    Example sentencesExamples
    • They lack two others, the notochord and post-anal tail, hence the name hemichordate.
    • The hemichordate sequences always contained considerable support for both hypotheses.
    • Evidence for the hemichordate affinity of the extinct graptolites has been steadily amassing.
    • Unfortunately there are no living fenestrate hemichordate species.
    • There are two classes of hemichordate, the pterobranchs and the enteropneusts, which differ greatly in appearance and lifestyle.
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