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单词 radula
释义

Definition of radula in English:

radula

nounPlural radulae ˈradjʊləˈrædʒələ
Zoology
  • (in a mollusc) a structure of tiny teeth used for scraping food particles off a surface and drawing them into the mouth.

    Example sentencesExamples
    • In some chitons, the radula has teeth tipped with magnetite, which hardens them.
    • Threadlike cilia-bearing tentacles probe for food, such as forams, detritus, and even the occasional buried bivalve, and bring it to the mouth where a large radula grinds it up.
    • Once the prey is snared it is bitten with strong beak-like jaws and pulled into the mouth by the radula.
    • Most mollusks use the radula to break up food, but the cone snail uses it to inject venom.
    • The correct characterization of fossil taxa is difficult as specimens are missing many important features necessary for an accurate identification, particularly protoconchs and radulae.

Derivatives

  • radular

  • adjective
    Zoology
    • It is significant that a minority of ammonites and incirrate octopods have radular teeth of this type, or exhibit much size dimorphism.
      Example sentencesExamples
      • Major interneurons fire cyclically during feeding in the radular retraction phase of the protraction/retraction cycle and drive many other retraction neurons.
      • Based on radular and soft-tissue morphology and personal observation of feeding behaviors, it appears that species from both regions feed suctorially with the assistance of a diminutive radula.
      • The main argument for the molluscan nature of Kimberella remains thus its association with putative radular marks proposed by Seilacher.

Origin

Late 19th century: from Latin, literally 'scraper', from radere 'to scrape'.

 
 

Definition of radula in US English:

radula

nounˈrajələˈrædʒələ
Zoology
  • (in a mollusk) a structure of tiny teeth used for scraping food particles off a surface and drawing them into the mouth.

    Example sentencesExamples
    • The correct characterization of fossil taxa is difficult as specimens are missing many important features necessary for an accurate identification, particularly protoconchs and radulae.
    • In some chitons, the radula has teeth tipped with magnetite, which hardens them.
    • Threadlike cilia-bearing tentacles probe for food, such as forams, detritus, and even the occasional buried bivalve, and bring it to the mouth where a large radula grinds it up.
    • Once the prey is snared it is bitten with strong beak-like jaws and pulled into the mouth by the radula.
    • Most mollusks use the radula to break up food, but the cone snail uses it to inject venom.

Origin

Late 19th century: from Latin, literally ‘scraper’, from radere ‘to scrape’.

 
 
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更新时间:2024/12/23 17:14:27