在线国产一区二区_成人黄色片在线观看_国产成人免费_日韩精品免费在线视频_亚洲精品美女久久_欧美一级免费在线观看

China's Jurassic fossil discovery sheds light on bird origins

By Yan Dongjie | chinadaily.com.cn | Updated: 2025-02-13 10:26
Share
Share - WeChat
Evolutionary tree of theropod dinosaurs (including birds) in the Mesozoic Era (about 250 million to 60 million years ago). [Photo provided to chinadaily.com.cn]

Although Archaeopteryx had feathered wings, it closely resembled non-avialan dinosaurs, notably due to its distinctive long, reptilian tail — a stark contrast to the short-tailed morphology of modern and Cretaceous birds. Recent studies have questioned the avialan status of Archaeopteryx, classifying it as a deinonychosaurian dinosaur, the sister group to birds. This raises the question of whether any unambiguous records of Jurassic birds exist.

In this study, the researchers named one of the two fossils Baminornis zhenghensis. This fossil displays a unique combination of features, including derived ornithothoracine bird-like shoulder and pelvic girdles, as well as a plesiomorphic hand structure resembling that of non-avialan dinosaurs. These characteristics highlight the role of mosaic evolution in early bird development. Notably, Baminornis zhenghensis has a short tail ending in a compound bone called the pygostyle, a feature also observed in living birds.

"Previously, the oldest record of short-tailed birds is from the Early Cretaceous. Baminornis zhenghensis is the sole Jurassic and the oldest short-tailed bird yet discovered, pushing back the appearance of this derived bird feature by nearly 20 million years," said Wang Min, the lead and corresponding author of the study.

|<< Previous 1 2 3 4 Next   >>|
Top
BACK TO THE TOP
English
Copyright 1995 - . All rights reserved. The content (including but not limited to text, photo, multimedia information, etc) published in this site belongs to China Daily Information Co (CDIC). Without written authorization from CDIC, such content shall not be republished or used in any form. Note: Browsers with 1024*768 or higher resolution are suggested for this site.
License for publishing multimedia online 0108263

Registration Number: 130349
FOLLOW US
主站蜘蛛池模板: 午夜视频一区二区 | 小罗莉极品一线天在线 | 青青青国产精品一区二区 | av免费网站在线观看 | 91精品资源 | 国产中文字幕一区二区三区 | 成人免费视频视频在线观看 免费 | 一区二区三区在线观看视频 | 欧美一级在线观看 | 精品欧美一区二区三区久久久小说 | 国产日韩欧美一区 | 日本在线观看一区 | 精品国产精品三级精品av网址 | 中文字幕av一区二区三区 | 中文字幕亚洲乱码 | 黄频免费在线观看 | 久久天堂| 中文字幕久久久 | 四虎网站在线观看 | 麻豆精品国产91久久久久久 | 国产精品高潮呻吟久久av黑人 | 一区二区网站 | 日韩成人在线观看视频 | 影音先锋国产 | 欧美精品第一页 | 欧美精品一区视频 | 国产精品国产 | 国内精品成人 | 热久久国产 | 九九热视频在线 | 成人在线播放 | 日本第一页 | 久草在线在线精品观看 | 国产一区二区三区免费观看 | 蜜臀久久99精品久久久久久宅男 | 日韩 欧美 激情 | 精品无码久久久久国产 | 久久久精品免费观看 | 精品视频一区二区在线 | 男女午夜视频 | 亚洲视频一区二区在线 |