The first skull of the ancestral giant panda Oct 25, 2011 3:55:45 GMT -9
Post by grrraaahhh on Oct 25, 2011 3:55:45 GMT -9
A 2-million-year-old panda skull fossil found in China, left, is compared to
a modern-day giant panda skull. This is the first skull of the earliest known
ancestor of the giant panda, researchers report.
This 2-million-year-old panda skull fossil was discovered in a limestone
cave in south China. This is the first skull of the earliest known ancestor
of the giant panda, researchers report.
Fossils of the giant panda Ailuropoda (Order Carnivora, Family Ursidae) are largely isolated teeth, mandibles, and a few rare skulls, known from the late Pliocene to late Pleistocene in China and Southeast Asia. Much of this material represents a Pleistocene chronospecies, Ailuropoda baconi, an animal larger than the living giant panda, Ailuropoda melanoleuca. The earliest certain record of Ailuropoda is the late Pliocene chronospecies, Ailuropoda microta, smaller than either A. baconi or A. melanoleuca, and previously known only from teeth and a few mandibles from karst caves in south China. Here, we report the discovery of the first skull of A. microta, establishing its cranial anatomy and demonstrating that the specialized cranial and dental adaptations of Ailuropoda for durophagous feeding behavior centered on bamboo were already evident in this late Pliocene species. The skull from Jinyin cave (Guangxi) and dental remains from other karst localities in southeastern China show that Ailuropoda microta occupied south China from ≈2 to 2.4 Myr ago after a marked global climatic deterioration. Dental and basicranial anatomy indicate a less specialized morphology early in the history of the lineage and support derivation of the giant panda from the Miocene Asian ursid Ailurarctos.
Jin C, Ciochon RL, Dong W, Hunt RM Jr, Liu J, Jaeger M, Zhu Q: The first skull of the earliest giant panda. Proc Natl Acad Sci USA 2007, 104:10932-10937.
PDF LINK: www.pnas.org/content/104/26/10932.abstract