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Related Experiment Videos

Opercular development and ontogenetic re-organization in a direct-developing frog.

E M Callery1, R P Elinson

  • 1Department of Anatomy and Cell Biology, University of Toronto, Toronto, Ontario, M5S 1A8, Canada.

Development Genes and Evolution
|February 17, 2001
PubMed
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The direct-developing frog Eleutherodactylus coqui lacks a tadpole stage. Its dermal folds are homologous to opercular folds in other frogs, indicating evolutionary adaptation.

Area of Science:

  • Developmental biology
  • Evolutionary biology
  • Amphibian research

Background:

  • The direct-developing frog Eleutherodactylus coqui exhibits an anuran life cycle devoid of a free-swimming tadpole stage.
  • This unique ontogeny results in the absence of many typical larval characteristics.
  • Understanding the developmental modifications in E. coqui provides insights into amphibian evolution.

Purpose of the Study:

  • To investigate the homology between dermal folds in Eleutherodactylus coqui and opercular folds in metamorphosing frogs.
  • To elucidate the developmental mechanisms underlying limb emergence in direct-developing frogs.
  • To explore the evolutionary pressures that led to the elimination of the tadpole stage.

Main Methods:

  • Comparative developmental analysis of Eleutherodactylus coqui and other anurans.

Related Experiment Videos

  • Histological examination of opercular fold development and forelimb emergence.
  • Hormonal assays to assess thyroid hormone dependence during opercular perforation.

    • Main Results:

    • The dermal folds of Eleutherodactylus coqui were found to be homologous to the opercular folds of metamorphosing frogs.
    • In both E. coqui and its metamorphic counterparts, opercular folds envelop the developing forelimb before perforation.
    • Opercular perforation in E. coqui proceeds independently of the forelimb and is not influenced by thyroid hormones.

    Conclusions:

    • The direct development in Eleutherodactylus coqui is characterized by the condensation of developmental stages, notably the excision of a prolonged larval period.
    • The opercular development in E. coqui suggests a modified ancestral Eleutherodactylus life-history where the tadpole stage was likely eliminated.
    • These findings contribute to understanding the evolutionary plasticity of amphibian development and life-history transitions.