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词汇 paedomorphosis
释义

Definition of paedomorphosis in English:

paedomorphosis

(US pedomorphosis)
noun ˌpiːdə(ʊ)ˈmɔːfəsɪsˌpiːdə(ʊ)mɔːˈfəʊsɪsˌpēdəˈmôrfəsəs
Zoology
  • see neoteny
    Example sentencesExamples
    • By comparison to other squamates, this morphology indicates skeletal paedomorphosis that is common in secondarily marine reptiles.
    • Germ layers, homology, larval evolution, larval origins of the vertebrates, paedomorphosis and heterochrony underpinned the origins of evolutionary embryology, and so I discuss each of these topics.
    • At a higher level, it is considered that vertebrates might have arisen from the pelagic larva of a tunicate-like organism by paedomorphosis, causing the retention of the larval characters into the adult phase.
    • This later result indicates that expression of paedomorphosis is associated with genetic changes that alter developmental timing.
    • Facultative paedomorphosis occurs in most species, though individuals in these species usually metamorphose fully into terrestrial adults with robust bodies and limbs, broad heads, and laterally-flattened tails.

Derivatives

  • paedomorphic

  • adjective ˌpiːdə(ʊ)ˈmɔːfɪk
    Zoology
    • (of an animal) retaining juvenile features as an adult.

      paedomorphic salamanders
      Example sentencesExamples
      • These extremely paedomorphic crinoids lacked arms, which conduct the feeding in normal crinoids.
      • Amphiumas are elongate, paedomorphic, aquatic salamanders that superficially resemble the primitive sirens (Sirenidae).
      • The orthaceans again have a fibrous secondary shell and are presumed to have arisen from some nisuisid stock, possibly by paedomorphic changes affecting pedicle development in particular.

Origin

1920s: from paedo- + -morph + -osis.

Definition of pedomorphosis in US English:

pedomorphosis

(British paedomorphosis)
nounˌpēdəˈmôrfəsəs
Zoology
  • see neoteny
    Example sentencesExamples
    • Germ layers, homology, larval evolution, larval origins of the vertebrates, paedomorphosis and heterochrony underpinned the origins of evolutionary embryology, and so I discuss each of these topics.
    • By comparison to other squamates, this morphology indicates skeletal paedomorphosis that is common in secondarily marine reptiles.
    • This later result indicates that expression of paedomorphosis is associated with genetic changes that alter developmental timing.
    • At a higher level, it is considered that vertebrates might have arisen from the pelagic larva of a tunicate-like organism by paedomorphosis, causing the retention of the larval characters into the adult phase.
    • Facultative paedomorphosis occurs in most species, though individuals in these species usually metamorphose fully into terrestrial adults with robust bodies and limbs, broad heads, and laterally-flattened tails.

Origin

1920s: from paedo- + -morph + -osis.

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