Evolutionary transition of dental formula in Late Cretaceous eutherian mammals

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• 作者：Alexander O. Averianov ; J. David Archibald
• 关键词：Dentition ; Dental ; Replacement ; Evolution ; Mammals ; Eutheria ; Cretaceous
• 刊名：Naturwissenschaften
• 出版年：2015
• 出版时间：October 2015
• 年：2015
• 卷：102
• 期：9-10
• 全文大小：1,656 KB
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• 作者单位：Alexander O. Averianov (1) (2)
  J. David Archibald (3)
  
  1. Zoological Institute, Russian Academy of Sciences, Saint Petersburg, Russia
  2. Department of Sedimentary Geology, Geological Faculty, Saint Petersburg State University, Saint Petersburg, Russia
  3. Department of Biology, San Diego State University, San Diego, CA, USA
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Life Sciences
  Environment
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-1904

文摘

Kulbeckia kulbecke, stem placental mammal from the Late Cretaceous of Uzbekistan, shows a transitional stage of evolution in the dental formula from five to four premolars. A non-replaced dP3/dp3 may occur as individual variation. In other specimens, the lower premolars are crowded with no space for development of dp3. As is evident from the CT scanning of one juvenile specimen, the development of dp3 started in a late ontogenetic stage and was confined to the pulp cavity of the developing p2. This dp3 would have been resorbed in a later ontogenetic stage, as the roots of p2 formed. The initial stage of reduction of the third premolar can be traced to stem therians (Juramaia and Eomaia), which have both dP3 and P3 present in the adult dentition. Further delay in the development of dP3/dp3 led to the loss of the permanent P3/p3 (a possible synapomorphy for Eutheria). The dP3/dp3 was present during most of the adult stages in the Late Cretaceous stem placentals Zhelestidae and Gypsonictops. This tooth is totally absent in basal taxa of Placentalia, which normally have at most four premolars.