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词汇 Orthonectida
释义

Definition of Orthonectida in English:

Orthonectida

plural noun ˌɔːθə(ʊ)ˈnɛktɪdəˌôrTHəˈnektidə
Zoology
  • A minor phylum of mesozoan worms which are internal parasites of a range of marine invertebrates.

    〔动〕直泳门

    Example sentencesExamples
    • As it turns out, the Orthonectida are almost certainly metazoans, particularly under our stem group definition; but it's anyone's guess whether they, or any other members of the mysterious Mesozoa, are also bilaterians.
    • They are now believed to be made up of two, possibly unrelated, groups: the Dicyemida and Orthonectida.

Derivatives

  • orthonectid

  • noun & adjective
    Zoology
    • In some orthonectids, circular and longitudinal muscles occur beneath the epidermis.

Origin

Modern Latin (plural), from Greek orthos 'straight' + nektos 'swimming' (see nekton).

Definition of Orthonectida in US English:

Orthonectida

plural nounˌôrTHəˈnektidə
Zoology
  • A minor phylum of mesozoan worms which are internal parasites of a range of marine invertebrates.

    〔动〕直泳门

    Example sentencesExamples
    • As it turns out, the Orthonectida are almost certainly metazoans, particularly under our stem group definition; but it's anyone's guess whether they, or any other members of the mysterious Mesozoa, are also bilaterians.
    • They are now believed to be made up of two, possibly unrelated, groups: the Dicyemida and Orthonectida.

Origin

Modern Latin (plural), from Greek orthos ‘straight’ + nektos ‘swimming’ (see nekton).

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