Convergent dental adaptations in pseudo-tribosphenic and tribosphenic mammals

Zhe-Xi Luo (), Qiang Ji and Chong-Xi Yuan
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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

Nature, 2007, vol. 450, issue 7166, 93-97

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.

Date: 2007
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DOI: 10.1038/nature06221

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