Navigation Links
Birch mouse ancestor discovered in Inner Mongolia is new species of rare 'living fossil'
Date:5/24/2011

ossil'" on the SMUVideo youtube channel.

An SMU doctoral student in the Huffington Department of Earth Sciences, Kimura was part of the international team that discovered the fossils during expeditions to Inner Mongolia in 2004, 2005 and 2007.

Microscopic evidence of a living fossil

The new fossils of Sicista primus from the Early Miocene age are also now the earliest known record of Sicista, the birch mouse genus that comprises 13 modern and 7 fossil species, said Kimura. As a result, Sicista now boasts the most ancient ancestry of the 326 genera in the largest rodent suborder to which it belongs, Myomorpha. The suborder includes laboratory mice and rats.

"The birch mouse is a rare case of a small mammal genus persisting from the Early Miocene without significant morphological changes," Kimura said in reporting the findings.

Rodents, both modern and prehistoric, rank as the most prolific mammals on earth. After the reign of dinosaurs, 65 million years ago, rodents evolved and dispersed worldwide during the Cenozoic, the "Age of Mammals." They comprise about 42 percent of all living mammals. Scientists know now that only 1.5 percent of modern rodent genera, however, go as far back as the Early Miocene or older.

"Diversity within a rodent genus is not unusual, but the long record of the genus Sicista, first recognized at 17 million years ago, is unusual," said Kimura. "The discovery of Early Miocene S. primus reveals that Sicista is fundamental to understanding how a long-lived genus persisted among substantially fast-evolving rodent groups."

Birch mice migrated from Asia to North America

Previously the record for the oldest species of Sicista belonged to an 8 million-year-old species identified in Eurasia, Kimura said.

In identifying the new species, Kimura also reverses the long-held hypothesis that ancestors of birch mice m
'/>"/>

Contact: Margaret Allen
mallen@smu.edu
214-768-7664
Southern Methodist University
Source:Eurekalert  

Page: 1 2 3 4

Related biology news :

1. Birch bark ingredient comes with many metabolic benefits
2. URI researchers help score knockout punch on birch tree pest
3. UofL researchers replicate human kidney gene changes in mouse model
4. New mouse model may lead to new therapies for degenerative diseases
5. MARC travel awards announced for GSA Mouse Genetics Conference
6. Mutant mouse reveals new wrinkle in genetic code, say UCSF scientists
7. Freeway air bad for mouse brain
8. Nicotine does not promote lung cancer growth in mouse models
9. Study shows rapamycin reverses myocardial defects in mouse model of LEOPARD syndrome
10. Researchers describe first functioning lipidome of mouse macrophage
11. Researchers insert identification codes into mouse embryos
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Birch mouse ancestor discovered in Inner Mongolia is new species of rare 'living fossil'
(Date:3/11/2015)... BOSTON , March 11, 2015   ... of its platform to scientifically measure and harness ... characteristics to real-time biometrics and objective measurements of ... of music at scale in large populations. It ... scientists, technologists and clinicians perform rigorous studies and ...
(Date:3/10/2015)... , March 10, 2015  NXT-ID, Inc. (NASDAQ: ... the "Company"), a biometric authentication company focused on ... Wocket™ smart wallet has been named the "Number ... Modern. Rethink Modern ( http://www.rethinkmodern.com/ ) ... for your home and lifestyle that have a unique ...
(Date:3/2/2015)... , March 2, 2015 Synaptics Inc. ... of human interface solutions, today announced a new ... designed to enable rapid and secure transactions and ... for gaming is a turnkey solution providing mouse ... to quickly integrate fingerprint ID solutions into their ...
Breaking Biology News(10 mins):Introducing The Sync Project, a Global Collaboration Harnessing the Scientific Potential of Music for Health 2Introducing The Sync Project, a Global Collaboration Harnessing the Scientific Potential of Music for Health 3NXT-ID's Wocket Smart Wallet Named Number One Best Tech Gift for 2015 by Rethink Modern 2NXT-ID's Wocket Smart Wallet Named Number One Best Tech Gift for 2015 by Rethink Modern 3NXT-ID's Wocket Smart Wallet Named Number One Best Tech Gift for 2015 by Rethink Modern 4Synaptics Unveils New Fingerprint ID Solution for Gamers 2Synaptics Unveils New Fingerprint ID Solution for Gamers 3
... and resource managers could soon have a highly detailed ... and ocean animals throughout the world, according to international ... , Academics, scientists and technical experts at the meeting ... window on marine life by expanding worldwide the work ...
... Technology research has discovered a method that could drastically ... years. Delft, in partnership with DHV engineering bureau, has ... aerobic bacteria form granules that sink quickly. An important ... Delft researcher Merle de Kreuk, who, on Tuesday, 27 ...
... into the closest freshwater pond, you'd hesitate before dipping ... an oddly furry, pear-shaped organism gliding along--and gobbling up ... has a big name-- Tetrahymena thermophila --and a big ... research into how cells work. , Scientists have now ...
Cached Biology News:Creating a window on 'oceans in motion' 2Creating a window on 'oceans in motion' 3Creating a window on 'oceans in motion' 4Delft water-purification method promises radical improvement 2What's shaped like a pear and has 2 genomes? Check the pond 2What's shaped like a pear and has 2 genomes? Check the pond 3
(Date:3/27/2015)... March 27, 2015 The consumption of ... of the recession and high prices in 2008. However, ... recovered and keeps on gaining momentum now. , To ... at more than 100,000 thousand tonnes. No considerable growth ... the global capacity rocketed during 2012-2013, registering 11% growth ...
(Date:3/27/2015)... LANSING, Mich. , March 27, 2015  Neogen ... Properties, LLC, has adopted a prearranged trading plan in ... James Herbert , Chairman and CEO of Neogen Corporation, ... shares of Neogen Corporation common stock. Herbert ... the disclosure was appropriate. The filing is only for ...
(Date:3/27/2015)... YORK , March 27, 2015  Peter Walter ... Biomedical Science for his pioneering work on how proteins ... components of a regulatory mechanism that cells use to ... Dr. Walter is a professor of biochemistry at the ... groundwork for treating a range of human diseases related ...
(Date:3/27/2015)... , March 27, 2015 WuXi PharmaTech ... open-access R&D capability and technology platform company serving ... announced today that an Investigational New Drug (IND) ... for rheumatoid arthritis has been accepted for review ... In September 2012, MedImmune, the ...
Breaking Biology Technology:World NPK Fertilizers Market Keeps On Gaining Momentum, According to BAC Reports Study Available at MarketPublishers.com 2World NPK Fertilizers Market Keeps On Gaining Momentum, According to BAC Reports Study Available at MarketPublishers.com 3Neogen CEO adopts 10b5-1 Trading Plan 2German-born cell biologist Peter Walter wins the 2015 Vilcek Prize in Biomedical Science 2German-born cell biologist Peter Walter wins the 2015 Vilcek Prize in Biomedical Science 3Investigational New Drug Application for WuXi MedImmune's Monoclonal Antibody Accepted for Review by CFDA 2Investigational New Drug Application for WuXi MedImmune's Monoclonal Antibody Accepted for Review by CFDA 3
... five years ago, you asked a group of chief ... said storage capacity, security or bandwidth. , ,Today, the ... of securities legislation, highlighted by Congress's passage of the ... come to be called. SOX, which was passed largely ...
... is encouraging angel investment in five more tech companies by ... under Act 255 to 17. , ,Governor Jim Doyle ... an audio technology company. , ,The state's Act 255 ... with a variety of programs, particularly tax credits for investors. ...
... Institute of Technology are coming together to offer Wisconsin companies ... MIT Club of Wisconsin, an organization of MIT alumni from ... meetings. The organization has grown to an estimated 600 members ... among MIT's state chapters. , ,According to Herb Zien, the ...
Cached Biology Technology:With Sarbanes-Oxley, compliance takes center stage for CIOs 2With Sarbanes-Oxley, compliance takes center stage for CIOs 3MIT alums boost Wisconsin high-tech businesses 2MIT alums boost Wisconsin high-tech businesses 3
... Low volume pipetting is increasingly essential ... in DNA sequencing and other biochemical ... performance and precision unparalleled in the ... confirmation of all aspirated,and dispensed volumes ...
Request Info...
Collected from sexually mature rats....
...
Biology Products: