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Related Experiment Videos

Dentition and tooth replacement pattern in Chalcides (Squamata; Scincidae).

Sidney Delgado1, Tiphaine Davit-Beal, Jean-Yves Sire

  • 1Equipe Evolution et développement du squelette dermique, UMR 8570, Université Paris 7, Paris cedex 05, France.

Journal of Morphology
|March 14, 2003
PubMed
Summary

This study reveals that tooth replacement in the Canarian skink Chalcides follows a predictable pattern. Knowing the developmental stage of one replacement tooth helps accurately predict the stage of adjacent teeth, aiding future research on tooth development.

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Area of Science:

  • Zoology
  • Developmental Biology
  • Herpetology

Background:

  • Lizards typically exhibit regular tooth replacement patterns.
  • Understanding tooth development is crucial for evolutionary and biological studies.
  • The Canarian skink Chalcides serves as a model organism for squamate tooth differentiation.

Purpose of the Study:

  • To determine if tooth replacement patterns in Chalcides can predict tooth development stages.
  • To establish a reliable method for assessing tooth development in this species.
  • To lay the groundwork for future investigations into tooth differentiation.

Main Methods:

  • Radiographic analysis of dentition in a growth series of 20 laboratory-reared Chalcides specimens (0.5 months to 6 years).
  • Recording tooth positions, tooth counts relative to age and season, and replacement tooth size.

Related Experiment Videos

  • Evaluating symmetry of tooth development between opposite jaw quadrants.

    • Main Results:

    • Chalcides maintains an average of 16 tooth positions per jaw quadrant throughout life.
    • Replacement teeth are numerous regardless of age or season, unlike variable functional teeth.
    • Tooth development prediction is most accurate when comparing successive replacement teeth along the jaw arcade, revealing a "Zahnreihen" pattern.

    Conclusions:

    • Tooth replacement in Chalcides occurs in alternate positions from back to front, forming regular rows.
    • The developmental stage of a replacement tooth can be accurately predicted using the stage of adjacent teeth (p-1 or p-2).
    • This predictability is valuable for future structural and ultrastructural studies of tooth differentiation in Chalcides.