Navigation Links
China fossil shows bird, crocodile family trees split earlier than thought
Date:5/18/2011

A fossil unearthed in China in the 1970s of a creature that died about 247 million years ago, originally thought to be a distant relative of both birds and crocodiles, turns out to have come from the crocodile family tree after it had already split from the bird family tree, according to research led by a University of Washington paleontologist.

The only known specimen of Xilousuchus sapingensis has been reexamined and is now classified as an archosaur. Archosaurs, characterized by skulls with long, narrow snouts and teeth set in sockets, include dinosaurs as well as crocodiles and birds.

The new examination dates the X. sapingensis specimen to the early Triassic period, 247 million to 252 million years ago, said Sterling Nesbitt, a UW postdoctoral researcher in biology. That means the creature lived just a short geological time after the largest mass extinction in Earth's history, 252 million years ago at the end of the Permian period, when as much as 95 percent of marine life and 70 percent of land creatures perished. The evidence, he said, places X. sapingensis on the crocodile side of the archosaur family tree.

"We're marching closer and closer to the Permian-Triassic boundary with the origin of archosaurs," Nesbitt said. "And today the archosaurs are still the dominant land vertebrate, when you look at the diversity of birds."

The work could sharpen debate among paleontologists about whether archosaurs existed before the Permian period and survived the extinction event, or if only archosaur precursors were on the scene before the end of the Permian.

"Archosaurs might have survived the extinction or they might have been a product of the recovery from the extinction," Nesbitt said.

The research is published May 17 online in Earth and Environmental Science Transactions of the Royal Society of Edinburgh, a journal of Cambridge University in the United Kingdom.

Co-autho
'/>"/>

Contact: Vince Stricherz
vinces@uw.edu
206-543-2580
University of Washington
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. Reforesting rural lands in China pays big dividends, Stanford researchers say
2. Rices origins point to China, genome researchers conclude
3. Solar greenhouses: Chinas winning solution to global energy crisis
4. Research literature from China listed in Medline
5. EARTH: Trade imbalance, America exports emissions to China
6. China PharmaHub Signs Distribution Agreement with Integrated Biometrics
7. Study examines risk of heterosexual HIV transmission in China
8. Virginia Techs Mueller receives friendship award from China
9. University of Utah microbubbles clean dirty soil in China
10. Measurements of CO2 and CO in Chinas air indicate sharply improved combustion efficiency
11. Chinas environmental challenges have global implications
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
China fossil shows bird, crocodile family trees split earlier than thought
(Date:8/28/2015)... August 28, 2015 According to ... Market by Assessment Type (Pen & Paper Based, Hosted, ... Corporate Learning, Academic Research), Vertical and Region - Global ... Training Market to grow from USD 2.4 Billion in ... Compound Annual Growth Rate (CAGR) of 25.6% from 2015 ...
(Date:8/26/2015)... 26, 2015 The report "Multi-Factor Authentication ... Factor), Application (Travel & Immigration, Government, Banking, Defense, Commercial ... to 2020", published by MarketsandMarkets, Multi-Factor Authentication Market is ... at a CAGR of 17.7% between 2015 and 2020. ... igures spread through 169 P ...
(Date:8/25/2015)... BELLEVUE, Wash. , Aug. 25, 2015 ... systems, announced today it will unveil its "Guardian S" ... at the National Tactical Officers Association Conference on August ... Guardian S is the first-ever commercially available energetically autonomous ... research and in-field trials and is protected by more ...
Breaking Biology News(10 mins):Cognitive Assessment and Training Market Worth 7.5 Billion USD by 2020 2Cognitive Assessment and Training Market Worth 7.5 Billion USD by 2020 3Cognitive Assessment and Training Market Worth 7.5 Billion USD by 2020 4Multi-Factor Authentication Market Worth 9.60 Billion USD by 2020 2Multi-Factor Authentication Market Worth 9.60 Billion USD by 2020 3Multi-Factor Authentication Market Worth 9.60 Billion USD by 2020 4Multi-Factor Authentication Market Worth 9.60 Billion USD by 2020 5Sarcos to Debut First-of-its-Kind Snake Robot 2Sarcos to Debut First-of-its-Kind Snake Robot 3
... to eat fiber and not abuse antibiotics. They,ve shown ... to protect patients, cardiovascular systems also plays a key role ... featured on the cover of the journal Immunity . ... the risk of colon problems and indicates that when fiber ...
... battle between the bacterial pathogen Salmonella and the ... at the Biozentrum of the University of Basel has now ... host,s immune system. Their findings are published in the scientific ... is a bacterial infection caused by the pathogen Salmonella ...
... More than 5,893 leaks from aging natural gas pipelines have ... research team from Duke University and Boston University. A ... researchers said. Some manholes had methane concentrations as high as ... times greater than the threshold at which explosions can occur. ...
Cached Biology News:Findings bolster fiber's role in colon health 2Findings bolster fiber's role in colon health 3Typhoid fever -- A race against time 25,900 natural gas leaks discovered under Washington, D.C. 25,900 natural gas leaks discovered under Washington, D.C. 3
(Date:8/28/2015)... ... August 28, 2015 , ... Pittcon is pleased to announce ... session on chemical spectroscopic imaging at JASIS 2015 (Japan Analytical & Scientific Instruments ... and scientific instruments show which will be held at International Conference Hall in ...
(Date:8/27/2015)... ... August 27, 2015 , ... The Kansas City ... firms and animal health companies to hear from animal health companies with the ... also received licensing agreements or distribution contracts. This meeting is one of ...
(Date:8/27/2015)... 27, 2015 The National Necrotizing Fasciitis ... life—were saved by doctors at Vanderbilt University Hospital in ... NovaBay Pharmaceuticals and Dr. John Crew , director ... Seton Medical Center in Daly City, CA. ... breakthrough approach, pioneered by Dr. Crew, that had previously ...
(Date:8/27/2015)... 2015 GlassesOff (OTCBB: GLSO), a visual ... the human vision system, announced today a partnership with eight-time ... Chris Paul to develop a new mobile app designed ... their real-life on-court performance. Vision is the inception ... shooting a ball or blocking a pass. The critical impact ...
Breaking Biology Technology:U.S. Symposium on Imaging Organized by Pittcon’s Program Chairman Chuck Gardner 2U.S. Symposium on Imaging Organized by Pittcon’s Program Chairman Chuck Gardner 3VetStem Biopharma, Inc. Among Seventeen Companies Selected to Present at the KC Animal Health Investment Forum on September 1st 2015 2VetStem Biopharma, Inc. Among Seventeen Companies Selected to Present at the KC Animal Health Investment Forum on September 1st 2015 3Patient's Life and Eyes Saved from Gruesome Flesh-Eating Infection Consuming Her Face 2Patient's Life and Eyes Saved from Gruesome Flesh-Eating Infection Consuming Her Face 3Eight-Time All-Star Chris Paul and GlassesOff Partner to Develop Innovative Mobile App Designed to Improve On-Court Performance 2Eight-Time All-Star Chris Paul and GlassesOff Partner to Develop Innovative Mobile App Designed to Improve On-Court Performance 3
... April 23 Cord Blood America,Inc. (Pink Sheets: ... ( http://www.cordblood-america.com ) focused on bringing the ... and internationally,today announced that it has been named ... area by The Los Angeles Business Journal., ...
... of the biggest-selling,biologics developed during the boom years in ... insulin, have lost patent,protection in the U.S. in 2007 ... billion. This opens up a huge potential market for ... new report by Kalorama,Information, Biogenerics: the World Market for ...
... TRIANGLE PARK, N.C., April 22 Quintiles,Transnational ... new practice,leaders and a business development head ... which provides pharmaceutical, biotech and medical,device companies ... minimize,risk from early discovery through commercialization., ...
Cached Biology Technology:Cord Blood America in Top 20 in Los Angeles Area Biotech-Biomed Companies 2Huge Potential in Biosimilars if Generic Providers Overcome Regulatory Hurdles 2Quintiles Consulting Business Expands 2Quintiles Consulting Business Expands 3Quintiles Consulting Business Expands 4
Rabbit polyclonal to SERHL ( Abpromise for all tested applications). entrezGeneID: 94009 SwissProtID: Q9H4I8...
Synaptotagmin, phosphoSer309...
Sheep polyclonal to Staphylococcus DNase ( Abpromise for all tested applications). Antigen: Full length native protein (purified)....
Mouse anti-hepatitis delta virus Class: Antibody Product Group: Bacterial and Viral Antigen...
Biology Products: