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舊 2006-04-30, 10:29 PM   #1
野人
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註冊日期: 2004-05-16
文章: 9,978
野人 是一個將要出名的人 野人 是一個將要出名的人
預設

這有趣!目前我對
pouches enclosing the gills are primitive for vertebrates, but have been subsequently lost in jawed vertebrates

的意涵不是很清楚,我先去找一些相關資料,再略譯成中文給看倌們瞧~

Quebec fish fossil shows early gill structure

cbc.ca

Last updated Apr 26 2006 06:08 PM EDT
CBC News

An ancestor of all vertebrates with jaws, including humans, had gills enclosed in pouches, say paleontologists studying a fish fossil found in Quebec.

A fish called Endeiolepis had gills that closely resemble those of modern jawless fish such as the lamprey, the team reports in Thursday's issue of the journal Nature. 

[img]http://magigugu.com/main/uploads/upload_image_1/img-20-fish-janvier-060426.jpg' border='0' alt='連結圖片' />
Reconstruction of Endeiolepis specimen. (Courtesy of P. Janvier, S. Desbiens, J. A. Willett, M. Arsenault)

Philippe Janvier of the Museum of Natural History in Paris and his team studied fossils of the fish displayed at the natural history museum in Miguasha, Que.

Assuming current thinking about vertebrate evolution is correct, "this discovery demonstrates that pouches enclosing the gills are primitive for vertebrates, but have been subsequently lost in jawed vertebrates."

The discovery means jawless vertebrates evolved from an ancient predecessor with the same gills, and the watery ancestor of humans once shared the same structure.

Scientists have long suspected all jawless vertebrates once had gill pouches, but until now there was little fossil evidence to support the idea.

[img]http://magigugu.com/main/uploads/upload_image_1/img-21-gill-janvier-060426.jpg' border='0' alt='連結圖片' />
Detailed view showing impressions of gill structures. (Courtesy of P. Janvier, S. Desbiens, J. A. Willett, M. Arsenault)

Janvier's team found one specimen of the 370-million-year-old fish had a total of 30 gill pouches, compared to seven in lampreys.

The large number of gill pouches suggest Endeiolepis likely lived in an environment where oxygen was much scarcer.
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