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Convergent dental adaptations in pseudo-tribosphenic and tribosphenic mammals

Author

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  • Zhe-Xi Luo

    (Carnegie Museum of Natural History, Pittsburgh, Pennsylvania 15213, USA)

  • Qiang Ji

    (Chinese Academy of Geological Sciences)

  • Chong-Xi Yuan

    (Chinese Academy of Geological Sciences)

Abstract

Good teeth Tribosphenic or 'grinding' molars seem to have evolved twice in mammals: once in the descendants of marsupials and placentals and once in a group of mammals whose descendants include the monotremes or egg-laying mammals. A new specimen of the latter, from the Middle Jurassic of Inner Mongolia, has teeth with very advanced morphology compared with the primitive nature of the rest of its body. This highlights the diversity of the ancient mammals — these fossil beds also yielded a beaver-like swimming mammal and an extremely archaic gliding mammal.

Suggested Citation

  • Zhe-Xi Luo & Qiang Ji & Chong-Xi Yuan, 2007. "Convergent dental adaptations in pseudo-tribosphenic and tribosphenic mammals," Nature, Nature, vol. 450(7166), pages 93-97, November.
    • Handle: RePEc:nat:nature:v:450:y:2007:i:7166:d:10.1038_nature06221
    DOI: 10.1038/nature06221
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