排序方式： 共有12条查询结果，搜索用时 451 毫秒
1.
发现于辽宁省西部 ,北票市尖山沟地区晚中生代义县组的不完整但是具有明显尾综骨的一串尾椎 ,可能代表一新的鸟类。该串尾椎的最后 5个椎体愈合成明显的尾综骨 ,但尾椎椎体及其前后加宽的神经棘之间的缝合线可以辨认出。前部至少保留 12个自由尾椎体。前部自由尾椎的前后关节面 相似文献
2.
正想亲眼看看以前只在初中生物课本上见过的始祖鸟化石吗?想知道《泰坦尼克号》的"海洋之心"原石是什么样的吗?4月9日下午,《地球》记者在国土资源部信息中心职工会议室举行的《中国长沙国际矿物宝石博览会有关情况》新闻发布会上获悉,在2008年奥运会开幕式曾邀其展示但未能如愿的始祖鸟化石,以及"海洋之心"原石等珍贵的矿物宝石,将在中国(长沙)国际矿物宝石博览会上集体亮相。中国第一台高规格的国际矿物宝石专业展会近年来,我国在私人收藏、教学 相似文献
3.
4.
在辽西义县的中德化石馆内有一件来自海外的明星标本,它就是大名鼎鼎的始祖乌。这是世界上目前发现的第10件完整的始祖鸟标本,它来自遥远的德国, 相似文献
5.
6.
新年伊始，英国《自然》杂志报道了来自辽宁热河群的一个轰动世界的古生物发现；我国科学家发现了四翼恐龙．为揭开鸟类飞行起源之谜打开了扇窗户。美国著名的进化论学者，加州大学柏克力分校的帕丁教授评论说：“这发现的潜在重要性和始祖鸟一样”．英国里兹大学的进化生物学家瑞讷博士称四翼恐龙是始祖鸟之后在鸟类演化研究领域最重要的发现。四冀恐龙是怎么发现的？它为什么如此重要？ 相似文献
7.
8.
9.
Jinfengopteryx Compared to Archaeopteryx, with Comments on the Mosaic Evolution of Long-tailed Avialan Birds 
下载免费PDF全文
下载免费PDF全文 JI Shu＇an JI Qiang 《《地质学报》英文版》2007,81(3):337-343
Jinfengopteryx is a newly uncovered Archaeopteryx-like avialan bird outside Germany, which was found from the Jehol Biota of northern Hebei in northeastern China. It shares many characters only with Archaeopteryx by the possession of three fenestrae in the antorbital cavity, 23 caudal vertebrae and long tail feathers attached to all the caudal vertebrae. But the former differs from the latter in the relatively short and high preorbital region of skull, more and closely packed teeth, much shorter forelimb compared to hindlimb. Such differences indicate Jinfengopteryx is even slightly more primitive than Archaeopteryx, although both birds can be placed at the root position of the avialan tree based on cladistic analysis. Shenzhouraptor is suggested to be slightly more advanced than Jinfengopteryx ＋ Archaeopteryx, supported by some derived features in teeth, shoulder girdles and forelimbs such as the reduction of tooth number, dorsolaterally directed glenoid facet, very long forelimb and comparatively short manus. Meanwhile, the tail of Shenzhouraptor shows more primitive characters than those of Jinfengopteryx and Archaeopteryx, e.g., the strikingly longer tail composed of more caudal vertebrae and the long tail feathers attached only to distal caudal segments. The mixed primitive and advanced characters reveal the evident mosaic evolution among long-tailed avialan birds. 相似文献
10.