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Geology spans the minute and gigantic, from skeletonized leaves in China to water on mars
Date:4/3/2014

y-style" melt rocks well known to geologists. The discovery opens a new door on Vredefort research, and aids the search for residua of older giant impacts believed, based on lunar records, to have melted and altered much of the Earth's first continental crust.


Evidence for insect-mediated skeletonization on an extant fern family from the Upper Triassic of China
Zhuo Feng et al., Yunnan Key Laboratory for Palaeobiology, Yunnan University, Kunming 650091, China; and Key Laboratory of Tropical Forest Ecology Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla 666303, China. Published online 21 Mar. 2014; http://dx.doi.org/10.1130/G35369.1.

Leaf skeletonization represents a distinctive form of insect feeding behavior. It commonly occurs in angiosperm leaves after their initial appearance at about 145-million-year ago, the beginning of a geologic period called the Cretaceous. This type of feeding behavior rarely has been documented in older fossils. A new study by Yunnan University paleobotanist Zhuo Feng and colleagues present the earliest evidence of insect-skeletonized leaves which belong to the extant umbrella ferns in the 210-million-year old (a geologic period called the Triassic) Yipinglang flora from Yunnan Province, southwestern China. Very similar to the modern insect feeding habit, in the skeletonized area of the fossil umbrella fern leaves, the interveinal tissue is completely removed, exposing the leave veins forming polygonal meshes of varying size. This study of insect-mediated skeletonization of fern leaves from southwestern China not only fills a spatiotemporal gap in the currently known data on the paleo-geographical distribution and stratigraphic occurrence of plant-arthropod associations, but also sheds light on the antagonistic relationship between a fern host and its insect consumer during their early evolutionary s
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert  

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Geology spans the minute and gigantic, from skeletonized leaves in China to water on mars
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