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Related Experiment Videos

Scanning microscopy of platypus teeth.

K S Lester, A Boyde

    Anatomy and Embryology
    |January 1, 1986
    PubMed
    Summary

    The platypus (Ornithorhynchus anatinus) has unique mammalian-like developing enamel and dentine. Its enamel is partially prismatic, differing from typical mammalian teeth structure.

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    Area of Science:

    • Paleontology
    • Zoology
    • Developmental Biology

    Background:

    • The platypus (Ornithorhynchus anatinus) is a monotreme, a group of mammals with unique evolutionary traits.
    • Understanding platypus dental development provides insights into mammalian evolution.

    Purpose of the Study:

    • To investigate the microstructure of developing and mature platypus teeth.
    • To compare platypus dental morphology with other mammals.

    Main Methods:

    • Scanning electron microscopy (SEM) of unerupted and erupted platypus teeth.
    • Tandem scanning reflected light microscopy.
    • Examination of prepared fractured surfaces and high contrast, back-scattered electron imaging.

    Main Results:

    • Mammalian-like developing fronts of enamel and dentine were observed.
    • Platypus enamel is partially prismatic, with crystallite groups generally perpendicular to the developing front.
    • Dentine exhibits a globular, mineralized pattern with sparse, fine dentinal tubules.
    • Enamel displays incremental lines, radial clefts, and crystallite domains, with fine tubules visible under specific imaging.
    • Cementum was not confidently identified; calcospherites were observed on unerupted surfaces not covered by enamel.

    Conclusions:

    • Platypus enamel microstructure deviates from the typically prismatic enamel found in many mammals.
    • The unique dental morphology of the platypus reflects its distinct evolutionary position.

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