2014年8月21日 Nature

nero1981

2014年8月21日 Nature5 O! |. C! |/ M  f5 k( e/ B
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John Sibbick’s painting imagines the iconic Early Jurassic basal mammals, Morganucodon and Kuehneotherium, hunting their favoured prey on the small island that they shared in what is now Glamorgan, southern Wales. The very earliest mammals, living in the Late Triassic and Early Jurassic around 200 million years ago, were small and are often presumed to have been generalized insectivores. Now a close study of Morganucodon and Kuehneotherium shows that niche partitioning and dietary specialization were well under way even at that early date. Analysis of tooth wear and jaw biomechanics shows that whereas Morganucodon had powerful jaws, capable of crushing hard prey such as beetles, Kuehneotherium was adapted for snapping at softer prey, such as the scorpion flies illustrated here. Cover: www.johnsibbick.com  k' U( ^. r: \! m4 k4 g# F# q
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kejiadong

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千细胞

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yzzb003

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yujiming

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whong1987

非常感谢

懵懂干细胞

感谢分享

troymuma

看一看

bobobuwa

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nkwh2000

谢谢