Ancient fossils clarify evolution of mammalian hearing

2019-12-09 09:20:21Xinhua Editor : Li Yan ECNS App Download
Fossils of Origolestes lii (Photo provided to Xinhua)

Fossils of Origolestes lii (Photo provided to Xinhua)

Researchers have discovered ancient fossils of a new Cretaceous mammal species in northeast China's Liaoning Province, finding a missing piece of the jigsaw puzzle of mammalian hearing evolution.

The research was jointly conducted by paleontologists from the Institute of Vertebrate Paleontology and Paleoanthropology (IVPP) under the Chinese Academy of Sciences and the American Museum of Natural History. Their findings were published in the latest issue of the journal Science. 

An early mammal could hardly hear anything except its own chewing sounds while eating since its auditory bones were attached to its jaw. When and how the clear division of function between hearing and chewing in modern mammals formed in evolution remained a mystery.

Reconstruction shows Origolestes lii died at rest. (Photo provided to Xinhua)
Reconstruction shows Origolestes lii died at rest. (Photo provided to Xinhua)

The newly-discovered fossils were well-preserved, with the bone link between auditory bones and jaw gone, showing a direct separation of hearing and chewing modules in mammalian evolution, said Mao Fangyuan, a member of the research team from the IVPP.

The multi-directional movements of the jaw during chewing may have accelerated the detachment of the auditory bones from the jaw, according to the research. 

The detachment of hearing and chewing modules in mammals eliminated their interference with each other and pushed the two modules' evolution forward, Mao said.

Related news


Most popular in 24h

MoreTop news


Back to top Links | About Us | Jobs | 彩票828app下载登入 | 太阳城娱乐手机版
Copyright ©1999-2019 All rights reserved.
Reproduction in whole or in part without permission is prohibited.
网站地图 名人限彩票注册登入 恒彩彩票二维码登入 名人彩票是真的吗登入
太阳城电子娱乐游戏 申博138真人娱乐 澳门太阳城娱乐官网 申博游戏开户
9号彩票上海快3 博彩娱乐登入 澳门新葡京平台网站直营网 银河彩票平台
恒彩娱乐公司在哪登入 名人彩票是真的假的登入 198彩官网198彩网址登入 彩99奖金能取出来吗登入
678彩官方网登入 吉利彩娱乐平台手机版登入 澳彩网彩票平台登入 名人彩票游戏登入
288TGP.COM XSB718.COM 528XTD.COM XSB868.COM S6183.COM 3454111.COM 1113889.COM