Navigation Links
Fossil discovery represents new milestone in early mammal evolution
Date:8/25/2011

A well-preserved fossil discovered in northeast China provides new information about the earliest ancestors of most of today's mammal species--the placental mammals.

According to a paper published today in the journal Nature, the fossil represents a new milestone in mammal evolution that was reached 35 million years earlier than previously thought.

It fills an important gap in the fossil record and helps to calibrate modern, DNA-based methods of dating evolution.

The paper, by a team of scientists led by Carnegie Museum of Natural History paleontologist Zhe-Xi Luo, describes Juramaia sinensis, a small shrew-like mammal that lived in China 160 million years ago during the Jurassic.

Juramaia is the earliest known fossil of eutherians--the group that evolved to include all placental mammals, which provide nourishment to unborn young via a placenta.

As the earliest known fossil ancestor to placental mammals, Juramaia provides fossil evidence of the date when eutherian mammals diverged from other mammals: metatherians (whose descendants include marsupials such as kangaroos) and monotremes (such as the platypus).

As Luo explains, "Juramaia, from 160 million years ago, is either a great-grand-aunt or a great-grandmother of all placental mammals that are thriving today."

The fossil of Juramaia sinensis was discovered in the Liaoning Province in northeast China and examined in Beijing by Luo and collaborators: Chong-Xi Yuan and Qiang Ji from the Chinese Academy of Geological Sciences and Qing-Jin Meng from the Beijing Museum of Natural History, where the fossil is stored.

The name Juramaia sinensis means "Jurassic mother from China."

The fossil has an incomplete skull, part of the skeleton, and, remarkably, impressions of residual soft tissues such as hair.

Juramaia's complete teeth and forepaw bones enable paleontologists to pinpoint that it is closer to living placental
'/>"/>

Contact: Cheryl Dybas
cdybas@nsf.gov
703-292-7734
National Science Foundation
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. Europe rallies behind nanotechnology to wean world from fossil fuels
2. Researchers uncover worlds oldest fossil impression of a flying insect
3. Caltech geobiologists discover unique magnetic death star fossil
4. Living fossil tree contains genetic imprints of rain forests under climate change
5. Bacterial biofilms as fossil makers
6. Hobbit fossils represent a new species, concludes University of Minnesota anthropologist
7. Dinosaur fossils fit perfectly into the evolutionary tree of life
8. Early whales gave birth on land, fossil find reveals
9. Worlds largest snake discovered in fossilized rainforest
10. Origin of claws seen in 390-million-year-old fossil
11. Famous fossil Lucy scanned at the University of Texas at Austin
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Fossil discovery represents new milestone in early mammal evolution
(Date:11/2/2014)... and Richard Feynman walk into a bar and bump into ... like the setup to some late-night nerd sketch, researchers have ... problem in modern biology, namely, finding meaning in the rising ... data comprisesreams of cancer mutations that genome-wide studies are publishing ... efficient ways to parse the signal from the noise (and ...
(Date:10/31/2014)... largest producer of cocoa. Chocolate trees ( Theobroma cacao ... of rainforest in the state of Bahia, beneath a ... rainforest was a biodiversity hotspot, the chocolate trees, which ... in the mid 1700s, had very low levels of ... scenario created a very romantic, but extremely fragile situation". ...
(Date:10/31/2014)... that emits over a wide part of the electromagnetic ... being built in Lund, Sweden. The MAX IV facility ... putting together its component parts in a storage - ... just a few hundred metres. Nevertheless, if these various ... of experiments that require source brightness and transverse coherence ...
Breaking Biology News(10 mins):Mutant models 2Mutant models 3Mutant models 4Scientists seek cure for devastating witches' broom disease of the chocolate tree 2Scientists seek cure for devastating witches' broom disease of the chocolate tree 3A new generation of storage -- ring 2
... the rate of preterm delivery rises accounting for ... State University epidemiologist is using a $3.7 million federal ... early are at an increased risk of developing cardiovascular ... which groups of women may benefit from early tracking ...
... LaBaer,s research team in the Biodesign Institute at Arizona State ... ---including several novel genes---that are involved in drug resistance to ... may one day aid in the treatment of the one ... empowering physicians with a more personalized approach to therapy as ...
... thousands of years, Inupiat Eskimos have relied on the bounty ... northern shoreline. Professor Deborah Bronk of the Virginia Institute ... the Arctic coastal ecosystem, and how climate change might affect ... which native peoples depend. Bronk,s research team, which will ...
Cached Biology News:Why do preterm deliveries pose cardiovascular risks for moms? 2Study identifies new genetic signatures of breast cancer drug resistance 2Study identifies new genetic signatures of breast cancer drug resistance 3Researchers brave icy waters to study Arctic food web 2Researchers brave icy waters to study Arctic food web 3
(Date:11/18/2014)... New Orleans, LA (PRWEB) November 17, 2014 ... developer of build-to-order, open architecture blade-based and rackmount ... new NVIDIA® Tesla® K80 dual-GPU accelerator throughout its ... Utilizing a pair of the company’s latest proprietary ... up to eight discrete NVIDIA Tesla K80 dual-GPU ...
(Date:11/18/2014)... 2014 Athena Signature Series: Turning Cancer ‘Off’ ... Emerson, a professor in the Regulatory Biology Laboratory at the ... discovery points to an “off switch” for drug resistance in ... her local research is making a global impact in the ... then join host Cheryl K. Goodman, CEO of Social Global ...
(Date:11/18/2014)... 18, 2014 American Process Inc. ... formed a partnership with researchers at Georgia Institute ... Technology, and the USDA’s Forest Products Laboratory to ... nanocellulose. Nanocellulose is a rapidly emerging high performance ... project is to replace heavy steel structures within ...
(Date:11/18/2014)... 18, 2014 2014 Deep ... is professional and in-depth report on Polytetrahydrofuran ... information, including its definition, characterization, application, and ... This exploration covers the worldwide business investigation, ... examination covering macroeconomic environment & financial circumstance ...
Breaking Biology Technology:Cirrascale® Expands Multi-GPU Peering Solutions with Support for New NVIDIA Tesla K80 Dual-GPU Accelerators 2Cirrascale® Expands Multi-GPU Peering Solutions with Support for New NVIDIA Tesla K80 Dual-GPU Accelerators 3American Process Inc. Announces Partnership to Develop Ultra-Strong, Lightweight Automotive Components Using Nanotechnology from Nature 2American Process Inc. Announces Partnership to Develop Ultra-Strong, Lightweight Automotive Components Using Nanotechnology from Nature 3PTMEG Market: 2019 Global Polytetrahydrofuran Industry Development Trends & Analysis Now at DeepResearchReports.com 2PTMEG Market: 2019 Global Polytetrahydrofuran Industry Development Trends & Analysis Now at DeepResearchReports.com 3
... Madison, Wis. Information technology leaders need ... Delphi Group founder and CEO Tom Koulopoulos in his ... a Culture of Change." , ,"We've got to make ... have about vision and leadership is integrated within the ...
... Information Networks Corp. caught IBM 's attention with ... Ohio, that allowed residents to conduct business with the city ... Madison company its annual "Best IBM iSeries On Demand Solution ... peak periods to provide more capacity. , ,This year, IBM ...
... Fiserv Inc. said it has acquired ... products from CCH Wall Street, which it plans to ... software that can submit licensing and registration filings electronically, ... for securities professionals, will be added to Fiserv's RegEd ...
Cached Biology Technology:
Rabbit polyclonal to MDM2 (phospho S185) ( Abpromise for all tested applications). entrezGeneID: 4193 SwissProtID: Q00987...
... Cultured human omental preadipocytes ... but otherwise healthy donors. ... of diabetic cells. Please ... Support media also available. ...
ASCIZ...
11-keto Testosterone EIA Antiserum hormones steroids antisera antiserum eias enzyme immunoassays reagents 11-keto-testosterone...
Biology Products: