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

Tiny fossil teeth discovered in Inner Mongolia are a new species of birch mouse, indicating that ancestors of the small rodent are much older than previously reported, according to paleontologist Yuri Kimura at Southern Methodist University in Dallas.

Fossils of the new species were discovered in sediments that are 17 million years old, said Kimura, who identified the new species and named it Sicista primus to include the Latin word for "first."

Previously the oldest prehistoric ancestor of the modern-day birch mouse was one that inhabited Inner Mongolia 8 million years ago.

Adding 9 million years to the ancestry of the rodent family that includes birch mice and jumping mice distinguishes this genus, Sicista, as a "living fossil," Kimura said. That places the genus among some of the most unique rodents on earth those whose ancestry spans 2 to 3 times the average, she said.

Kimura identified Sicista primus from 17 tiny teeth, whose size makes them difficult to find. A single molar is about the size of half a grain of rice. The teeth, however, are distinctive among the various genera of rodents known as Dipodidae. Cusps, valleys, ridges and other distinguishing characteristics on the surface of the teeth are identifiable through a microscope.

"We are very lucky to have these," Kimura said. "Paleontologists usually look for bones, but a mouse is very tiny and its bones are very thin and fragile. The teeth, however, are preserved by enamel. Interestingly, small mammal teeth are very diverse in terms of their structure, so from that we can identify a species."

Kimura reported the new species in the article "The earliest record of birch mice from the Early Miocene Nei Mongol, China" in the scientific journal Naturwissenschaften. Images of the expedition and fossil teeth are posted on the SMU Research flickr page. Kimura discusses the research in "Inner Mongolia yields 'living f
'/>"/>

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:3/24/2015)... WASHINGTON , March 24, 2015   NexID ... applications with critical security-authentication needs, today announced the beginning ... fake-finger-detection (FFD) solution. The company, based in ... announcement at the three-day Connect:ID Expo, which began here ... NexID said version 2.0 of its SDK boosts ...
(Date:3/23/2015)...  In the 2014 fiscal year, irs.gov recorded over ... figure accounts for a fraction of the estimated losses ... exceeds $11 billion globally. The polygraph has traditionally been ... occurred. Investor Mark Saint Juste along with ... partnered to administer the test in a new ...
(Date:3/20/2015)... -- NXT-ID, Inc. (NASDAQ: NXTD ) ("NXT-ID" or ... growing mobile commerce market, announces its biometric payment technology, ... featured in 2015 "I Want That" International CES Special, ... the DIY Network.   DIY,s "I Want ... site of the 2015 International CES for a firsthand ...
Breaking Biology News(10 mins):NexID Begins Shipments Of Version 2.0 Fake-Finger-Detection Solution 2Polygraph Test Now Used to Protect Investors From Fraud 2Polygraph Test Now Used to Protect Investors From Fraud 3NXT-ID's Wocket Biometric Smart Wallet to Air on "I Want That" International CES Special 2NXT-ID's Wocket Biometric Smart Wallet to Air on "I Want That" International CES Special 3
... contribute to the greenhouse gas emissions that are causing climate change. ... How we travel, what we eat, what we consume and what ... our carbon footprint . How, though, do we measure ... to find out on April 26, when Louis S. Santiago ...
... children in the United States are obese, and in inner-city ... diets and physical inactivity are the main culprits, there is ... A study by Columbia University,s Mailman School of Public ... to higher concentrations of chemicals called polycyclic aromatic hydrocarbons, or ...
... of the most common types of human leukemia may ... to new research led by physician-scientists at the University ... Cancer Center. Published this week in the journal ... in the FLT3 gene as targets for acute myeloid ...
Cached Biology News:Measuring our carbon footprint 2Prenatal exposure to air pollution linked to childhood obesity 2Prenatal exposure to air pollution linked to childhood obesity 3An Achilles heel of AML 2An Achilles heel of AML 3
(Date:4/24/2015)... April 24, 2015  Pfenex Inc. (NYSE MKT: PFNX) ... biosimilar therapeutics including high value and difficult to manufacture ... offering of 6,000,000 shares of its common stock at ... Of the shares being offered, 2,610,000 are being offered ... offered by existing stockholders. Pfenex will not receive any ...
(Date:4/24/2015)... 24, 2015  Navitas Life Sciences is delighted to announce ... Clinical and Regulatory Services. Shalabh is a proven leader in ... CEO of Kinapse, as well as a Strategy consultant at ... - http://photos.prnewswire.com/prnh/20150423/201261LOGO ... "I am delighted to welcome Shalabh into this critical role ...
(Date:4/24/2015)... 2015 Seoul Semiconductor announced the ... applications in the lighting market. In recent ... this technology in emerging markets such as Russia, ... range of applications such as streetlight and area ... , First launched in 2005 the Acrich technology ...
(Date:4/23/2015)... (PRWEB) April 23, 2015 Athena San ... development of executive women in San Diego’s technology and ... 17th Annual Pinnacle Awards at their Gala on April ... Hotel. Register now at http://athenasd.org/events/ , The ... the Athena San Diego vision of fostering networking, risk ...
Breaking Biology Technology:Pfenex Inc. Announces Pricing Of Follow-on Offering 2Shalabh Kumar Joins Navitas Life Sciences to Lead their Clinical and Regulatory Services Teams 2Acrich Technology from Seoul Semiconductor Adopted in Installations Worldwide 2Athena Pinnacle Awards to Honor Executives, Corporations and Educators Working to Promote Women Leaders 2
... , Abstract ... technologies enable expression array analysis from extremely limited cell mass. ... amplification protocols, and novel quality assurance checks is used in ... with confidence. This application note provides a workflow for laser-cut ...
... Key words: LEADseeker • ... , The ... detects and quantitates light from a range of radiometric, luminescence, and fluorescence ... the combination of format-free imaging (fluorescence assays can be read in as ...
... , ... receptor binding assay • LEADseeker • SPA Imaging ... In mammals, serotonin (5-hydroxytryptamine, 5-HT) is a regulator of ... <P ,>The serotonin 5-HT 2C receptor is a subtype of ...
Cached Biology Technology:Microgenomic Expression Profiling 2Microgenomic Expression Profiling 3Microgenomic Expression Profiling 4Microgenomic Expression Profiling 5Microgenomic Expression Profiling 6Microgenomic Expression Profiling 7Integration of the LEADseeker Multimodality Imaging System with automated plate loading and incubation using Overlord Instrument software 2Integration of the LEADseeker Multimodality Imaging System with automated plate loading and incubation using Overlord Instrument software 3Integration of the LEADseeker Multimodality Imaging System with automated plate loading and incubation using Overlord Instrument software 4The development of a serotonin 5-HT2C receptor-binding assay using the LEADseeker Multimodality Imaging System 2The development of a serotonin 5-HT2C receptor-binding assay using the LEADseeker Multimodality Imaging System 3The development of a serotonin 5-HT2C receptor-binding assay using the LEADseeker Multimodality Imaging System 4
... Detection of Total Canine Endostatin. ... Life Science products include a line ... kits and reagents used for multiple ... test kits are ultra-sensitive, quick and ...
Formula variant: With the macro- and micronutrients as described by Lloyd and McCown (1981). Preparation Quantity Equivalency: Formulated to contain 2.3 grams of powder per liter of medium. Physical ...
Reported to support murine B lymphocytes, hematopoietic tissue from bone marrow, B cells stimulated with lipopolysaccharide, T lymphocytes, and a variety of hybrid cells....
... of Ham's F-12 was developed for culturing ... fusion. The modification consists of doubling the ... acid. The salt concentrations have been altered ... zinc sulfate per liter, which may render ...
Biology Products: