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Fossil evidence for the origin of the marsupial pattern of tooth replacement

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Abstract

EXTANT marsupials are distinctive in their pattern of dental development1, in that only one tooth is replaced postnatally in each jaw. Interpretation of this pattern for marsupials ancestrally is disputed2–5, partly because ontogenetic data in fossils have been unobtainable. Here we present an ultra-high-resolution X-ray computed tomography (CT) study of the tiny fossil Alphadon, which represents the first evidence of dental development and replacement in a Mesozoic marsupial. In the known pattern of tooth replacement and development, Alphadon is identical to living marsupials, a derived similarity suggesting that this pattern is ancestral to Marsupialia, and that it was established by the Late Cretaceous, at least. This pattern has been correlated with some specialized aspects of marsupial lactation1,6. Hence the presence of a marsupial pattern of tooth replacement in Alphadon provides indirect evidence that at least some specialized features of marsupial reproductive processes arose during the Mesozoic.

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Authors and Affiliations

  1. Oklahoma Museum of Natural History and Department of Zoology, University of Oklahoma, Norman, Oklahoma, 73019, USA

    Richard L. Cifelli & James Banta

  2. Department of Geological Sciences, University of Texas, Austin, Texas, 78712, USA

    Timothy B. Rowe & Reuben Reyes

  3. Department of Anatomy, Medical Sciences Campus, University of Puerto Rico, P.O. Box 365067, San Juan, Puerto Rico, 00936, USA

    W. Patrick Luckett

  4. Department of Anatomical Sciences, University of Oklahoma, P.O. Box 26901, Oklahoma City, Oklahoma, 73190, USA

    Robert I. Howes

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  1. Richard L. Cifelli
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  2. Timothy B. Rowe
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  3. W. Patrick Luckett
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  4. James Banta
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  5. Reuben Reyes
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  6. Robert I. Howes
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Cifelli, R., Rowe, T., Patrick Luckett, W. et al. Fossil evidence for the origin of the marsupial pattern of tooth replacement. Nature 379, 715–718 (1996). https://doi.org/10.1038/379715a0

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  • DOI: https://doi.org/10.1038/379715a0

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