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单词 planula
释义

Definition of planula in English:

planula

nounPlural planulae ˈplanjʊləˈplanyələ
Zoology
  • A free-swimming coelenterate larva with a flattened, ciliated, solid body.

    as modifier a planula larva
    Example sentencesExamples
    • Hydra lives in freshwater, lacks a ciliated planula, and has clearly lost a medusa stage during its ancestry.
    • The planulae of most cnidarians attach and lose, at most, a coat of swimming cilia.
    • Fertilized eggs may be brooded for a time or may develop directly into a free-swimming, ciliated planula larva.
    • The planula larva has very few apoptotic cells.
    • The planula larva settles on a hermit crab shell and metamorphoses into a primary polyp.

Origin

Late 19th century: modern Latin, diminutive of Latin planus 'plane, flat'.

 
 

Definition of planula in US English:

planula

nounˈplanyələ
Zoology
  • A free-swimming coelenterate larva with a flattened, ciliated, solid body.

    as modifier a planula larva
    Example sentencesExamples
    • The planula larva settles on a hermit crab shell and metamorphoses into a primary polyp.
    • The planulae of most cnidarians attach and lose, at most, a coat of swimming cilia.
    • Fertilized eggs may be brooded for a time or may develop directly into a free-swimming, ciliated planula larva.
    • Hydra lives in freshwater, lacks a ciliated planula, and has clearly lost a medusa stage during its ancestry.
    • The planula larva has very few apoptotic cells.

Origin

Late 19th century: modern Latin, diminutive of Latin planus ‘plane, flat’.

 
 
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更新时间:2024/12/24 8:40:08