Early, smaller version of T. rex discovered
来源:互联网 发布:营养配餐软件正式版 编辑:程序博客网 时间:2024/05/05 18:58
http://news.yahoo.com/s/ap/20090917/ap_on_sc/us_sci_tiny_t_rex;_ylt=Am4RqCC.p79POQe9SNAMqk0PLBIF;_ylu=X3oDMTJtdGo4dnRmBGFzc2V0A2FwLzIwMDkwOTE3L3VzX3NjaV90aW55X3RfcmV4BHBvcwMxBHNlYwN5bl9hcnRpY2xlX3N1bW1hcnlfbGlzdARzbGsDZWFybHlzbWFsbGVy
WASHINGTON – About 125 million years ago a tiny version of Tyrannosaurus rex roamed what is now northeastern China. Tiny, that is, by T. rex standards — you still wouldn't want to meet it face to face.
Described by paleontologist Paul Sereno as "punk size," this early predator would have weighed about 150 pounds.
It just seems small compared to the giant T. rex that evolved millions of years later and was as much as 100 times more massive.
"It really is the blueprint for the later (T. rex) dinosaurs," Sereno said, "it was a blueprint that was scalable."
Described for the first time in Thursday's ScienceExpress, the online edition of the journal Science, the new dinosaur has been named Raptorex kriegsteini.
Sereno reports that Raptorex has all the hallmarks of T. rex, including a large head, tiny arms and lanky feet — just in a smaller size.
"What we're looking at is a blueprint for a fast-running set of jaws," Sereno said at a briefing arranged by the American Association for the Advancement of Science.
The giant T. rex dominated much of the planet from about 90 million years ago until the great extinction 65 million years ago.
Raptorex would have stood a lanky 9 feet tall, said Sereno, of the University of Chicago and also a National Geographic explorer in residence.
The newly described remains were found by fossil hunters in northern China, smuggled out of that country and offered for sale to collector Henry Kriegstein of Higham, Mass., Sereno said. Kriegstein, for whom the animal is now named, donated the materials to science and they will be returned to China.
The fossil was encased in a single block of stone, Sereno said. That stone allowed the researchers to trace the find to its original location.
The way the bones were fused indicates the animal died at the age of five or six, which is nearly adult. It would have matured at eight or 10 and been old by 20, added co-author Stephen Brusatte of the American Museum of Natural History.
The find also shows that features such as the animal's tiny arms did not evolve as T. rex grew larger, but were present in the much earlier forms, Brusatte said.
"Much of what we thought we knew about T. rex turns out to be simplistic or out-and-out wrong," Brusatte said.
Sereno said Raptorex was a predator. Some scientists debate whether T. rex was a predator or scavenger.
Dinosaur expert John R. Horner of the Museum of the Rockies at Montana State University was cautious about the find.
"It's hard to evaluate their conclusions," he said, calling the report interesting but adding that the drawing in the paper shows some differences from a T. rex in addition to being smaller.
However, he added, he didn't see anything that would disprove their theory that Raptorex was an ancestor of T. rex.
The research was funded by the Whitten-Newman Foundation and the National Geographic Society.
- Early, smaller version of T. rex discovered
- 恐龙快跑(Flappy T-Rex)
- Opration Procedure of Early Computers
- REX。。。。。
- Rex
- LintCode_284 Count of Smaller Number
- LintCode_248 Count of Smaller Number
- #248 Count of Smaller Number
- [Lintcode]Count of Smaller Number
- lintcode: Count of Smaller Number
- Step by Step of How TPTI-07-013 was Discovered
- come on, the sunshine of early summer
- The little thing of getting up early
- [LintCode]Count of Smaller Number before itself
- leetcode Count of Smaller Numbers After Self
- leetcode Count of Smaller Numbers After Self
- [LeetCode315]Count of Smaller Numbers After Self
- leetcode Count of Smaller Numbers After Self
- 高压开关柜温度监测系统、高压开关柜测温系统
- 推荐一篇网络安全方面的文章,介绍HTTPS
- 我公司供应手机物料如下
- 电缆温度监测系统、电缆接头测温系统
- oracle高级分组
- Early, smaller version of T. rex discovered
- Winodws Socket I/O模型的整理
- STM32多通道ADC规则转换实现了(转)!
- 高压设备综合监控系统,安全集中监控系统
- How to use INF in MS Driver Package
- 无法载入 mysql 扩展
- LED数字钟
- No WebApplicationContext found: no ContextLoaderListener registered?
- 我的博客正式开张了!