首頁最新消息簡介攝影畫廊讀經日引網上資源網上下載網上討論區聯絡我們
聖經金句

主啊,你世世代代作我們的居所。諸山未曾生出,地與世界你未曾造成,從亙古到永遠,你是神。
詩篇 90:1-2



 
聖經查詢
聖經查詢(新版)
關於我們
目錄導覽
音樂詩歌點播
文化天地
時事論壇
網上教會
世界經濟
育博通
珠璣集
幽默
News
教育中心
時代論壇报
山行文化出版社
文藝園地
健康資訊
中美友好協會
美國新聞
南粵之窗
Amazing Qingdao - 今日青島
教會機構專欄精選
網上奉獻與支持
故障申告
聯絡我們
網站維護

設為首頁
加入「我的最愛」
瀏覽流量統計
人數: 1,304,893 
頁數: 27,458,366 
下載: 8,097 
Since 11/2005


訂閱電子報

訂閱電子週報
自訂閱名單移除
電郵Email:



  
   

Bookmark and Share   
 
Fossils indicate earlier arrival of 'the Age of Fish' in Yunnan
3/19/2017



Photo/Yunnan Daily
Scientists have described a new primitive fish that evolved some 423 million years ago, before the period known as the "Age of Fish," after studying fossils unearthed in Qujing in southwest China's Yunnan Province.

Recent discoveries found at the Kuanti Formation led to descriptions of the new fish species, which is believed to have been 20 cm long and covered in thick rectangular scales, according to Zhu Min, research professor and overall coordinator of the Silurian-Devonian fish research at the Institute of Vertebrate Paleontology and Paleoanthropology under the Chinese Academy of Sciences.

Brian Choo from Flinders University, Australia, has worked with Zhu since 2009. He explained that the fossil was initially thought to be a new species of Psarolepis, a fish discovered in slightly more recent sediment.

"When we started looking at this beautifully preserved specimen in detail in 2010, we immediately noticed it was a quite different animal," said Choo in an e-mail to Xinhua.

The new fish, Sparalepis tingi, is a close relative of Guiyu and Psarolepis from the same region, but displays unique characteristics, with distinctive bone ornamentation and extremely tall, thick scales, he noted.

Specifically, it has unique interlocking structures on the scales at the front of its body, which help to illustrate that, even at this early stage, bony fish were displaying considerable diversity and anatomical advances, Choo explained.
Zhu and Choo view the Kuanti Formation as unique window into what is still a largely unknown chapter in the history of vertebrate life.

Only tiny fragments of Silurian jawed fish were known up until the end of the 20th century, from sites scattered around the globe. Almost all understanding of the early evolution of jawed vertebrates was based on more complete discoveries from the later Devonian Period (419.2-358.9 million years ago).

Thus, the Devonian Period is often called "The Age of Fish," due to the apparent increase in vertebrate size and variety over the preceding Silurian Period.

In the past few years, however, there have been some major discoveries at Qujing, forcing scientists to re-evaluate what they thought they knew about vertebrate evolution, Choo said.

For instance before Kuanti, little evidence of large jawed vertebrates from before the Devonian were available for scientists to study. Silurian fish were thought to be generally small and occupy low positions on the food chain, with the top marine predators being invertebrates such as sea scorpions.
The discovery of Megamastax, which Choo named in 2014, however, revealed that large predatory fishes, well over a meter in length, prowled the Silurian seas of south China.

The excitement surrounding Kuanti comes from the unparalleled quantity and quality of Silurian fossilized fish available for study.

In other Silurian sites around the world, jawed fish are generally only represented by a handful of small forms. Whereas at Qujing, which back then was situated near an equatorial coast, researchers are learning of a pre-Devonian fauna with dozens of bizarre species, some growing quite large.
"It seems that the "Age of Fish" arrived early in south China, although we still don't have enough information to know exactly why this was the case," said Choo.

"The ongoing discoveries at Qujing have drastically enhanced our understanding. This is the only place on Earth to have yielded articulated remains of jawed fishes from before the Devonian, beginning with Guiyu described in 2009," said Choo.

"Scientists were shocked and exhilarated by these fossils finds, revealing that Silurian fishes were larger, far more diverse and much weirder than expected," he said.

Zhu said that his research team have identified a growing number of bizarre fish living with Sparalepis tingi, including Guiyu oneiros, the first completely preserved Silurian bony fish fossil.

Sparalepis tingi was the second such well-preserved fossil from this group and provided significant new evidence for the understanding of the early diversification of jawed vertebrates and the origin of bony fish, Zhu said.
Another major Kuanti discovery, announced in 2013, was the description of Entelognathus, a fish combining a placoderm-like trunk armor with the jawbones of a bony fish, which demonstrated that the bones in our human face originated among the placoderms, Choo explained.

Before that finding, placoderms (an extinct group of jawed fish with bony armor) were considered an evolutionary dead end. The skulls of modern bony vertebrates, including humans, were thought to have evolved independently.

"With great quantities of Kuanti fossils awaiting description, representing multiple species of previously unknown fish, we can expect more surprises in the future," said Choo.

A detailed research article written by Choo and Zhu was published March 8 in the international journal "PLOS ONE."

Editor: Eric Wang


相關訊息

Dali Intl photography exhibition highlights Yunnan's beauty 
 

Trending Words in China | 加戏(added play ) 
 

Shangri-La Beer: A taste of highland barley and Swiss craft 
 

E-commerce helps villagers get rid of poverty in Yunnan 
 

金磚國家創客大賽在雲南Yunnan昆明舉行 
 

雲南Yunnan石林擬建空中觀光軌道 
 

Goodness, truth and beauty: See today’s Shangri-La 
 

Goodness, truth and beauty: See Shangri-La today  
 

Rewards Presented in Yunnan Magic Championship 
 

Explore mushroom mountain in autumn  
 

Symposium held to protect Asian elephant 
 

In pics: Sight-seeing boom at Potatso National Park in NW Yunnan 
 

2017 Kunming half marathon to take off next month 
 

雲南Yunnan建水柴窯“淘”寶活動收官 
 

雲南Yunnan香格里拉啤酒,青稞味+“瑞士味” 
 

本目錄中最多閱覽的文章

視頻:雲南麗江市西北部有一個地方可以觸摸星空 
在這堙A你有機會體驗壯麗的丹霞地貌,冰川湖泊,森林,高山草甸,自然的美麗難以形容。

Video: Eastern #Valentine’s Day in Lanping, Yunnan 
For Pumi people living in Lanping Bai and Pumi Autonomous County, in northwest #Yunnan’s Nujiang Lisu Autonomous Prefecture, May 30 is not only the Chinese traditional Dragon-boat Festival, but also the annual local Valentine’s Day.

Yunnan-Myanmar tourism promotion held in Nay Pyi Taw 


Teenager caught trafficking drugs from Myanmar to China 


Yulong Mountain, Yunnan embraces late spring coldness 


   Email: sino.american2020@gmail.com    Powered by Web4Jesus (W4J) Ministry