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单词 pterobranch
释义

Definition of pterobranch in English:

pterobranch

noun ˈtɛrə(ʊ)braŋkˈterəˌbraNGk
Zoology
  • A minute tube-dwelling colonial acorn worm found chiefly in deep water.

    Class Pterobranchia, phylum Hemichordata

    Example sentencesExamples
    • The ciliary bands on the phoronid and brachiopod tentacles are upstream-collecting bands with separate cilia on monociliate cells just like those of larvae or adults of pterobranchs, echinoderms and enteropneusts.
    • Ax favors the Pharyngotremata hypothesis, but compiles evidence that not only the hemichordates but also the pterobranchs are paraphyletic grades.
    • Previously, hemichordates were thought to be paraphyletic, with enteropneusts (acorn worms) more closely related to chordates and pterobranchs closer to echinoderms.
    • The SSU data supported enteropneust paraphyly by placing acorn worms of the family Ptychoderidae as the sister to a group consisting of pterobranchs + acorn worms of the family Harrimaniidae.
    • There are two classes of hemichordate, the pterobranchs and the enteropneusts, which differ greatly in appearance and lifestyle.
 
 

Definition of pterobranch in US English:

pterobranch

nounˈterəˌbraNGk
Zoology
  • A minute tube-dwelling colonial acorn worm found chiefly in deep water.

    Class Pterobranchia, phylum Hemichordata

    Example sentencesExamples
    • There are two classes of hemichordate, the pterobranchs and the enteropneusts, which differ greatly in appearance and lifestyle.
    • The ciliary bands on the phoronid and brachiopod tentacles are upstream-collecting bands with separate cilia on monociliate cells just like those of larvae or adults of pterobranchs, echinoderms and enteropneusts.
    • Ax favors the Pharyngotremata hypothesis, but compiles evidence that not only the hemichordates but also the pterobranchs are paraphyletic grades.
    • The SSU data supported enteropneust paraphyly by placing acorn worms of the family Ptychoderidae as the sister to a group consisting of pterobranchs + acorn worms of the family Harrimaniidae.
    • Previously, hemichordates were thought to be paraphyletic, with enteropneusts (acorn worms) more closely related to chordates and pterobranchs closer to echinoderms.
 
 
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更新时间:2024/12/23 9:40:35