Navigation Links
Paleontologists discover new mammal from Mesozoic Era

Mammalian hearing adaptation is made possible by a sophisticated middle ear of three tiny bones, known as the hammer (malleus), the anvil (incus) and the stirrup (stapes), plus a bony ring for the eardrum (tympanic membrane).

The mammal middle ear bones evolved from the bones of the jaw hinge in their reptilian relatives. However, paleontologists long have attempted to understand the evolutionary pathway via which these precursor jaw bones became separated from the jaw and moved into the middle ear of modern mammals.

"Now we have a definitive piece of evidence, in a beautifully preserved fossil split on two rock slabs," said Luo. "Yanoconodon clearly shows an intermediate condition in the evolutionary process of how modern mammals acquired their middle ear structure."

Yanoconodon is about 5 inches (or 15 cm) long and estimated to weigh about 30 grams. Its teeth are notable for the three cusps in a straight line on molars (thus known as a triconodont) for feeding on insects and worms. It has a long body, short and sprawling limbs and claws that were ideal for either digging or living on the ground.

In addition to its unique ear structure, Yanoconodon also has a surprisingly high number of 26 thoracic ("chest") and lumbar ("waist") vertebrae, unlike most living and extinct terrestrial mammals that commonly have 19 or 20 thoracic and lumbar vertebrae. The extra vertebrae give Yanoconodon a more elongated body form, in contrast to its relatively shorter and very primitive limb and foot structures. The new mammal also has lumbar ribs, a rare feature among modern mammals.

"The discoveries of exquisitely preserved Mesozoic mammals from China have built the evidence such that biologists and paleontologists are able to make sense of how developmental mechanisms have impacted the morphological evolution of the earliest mammals," said Luo.
'"/>

Source:National Science Foundation


Page: 1 2

Related biology news :

1. Paleontologists learn how not to become a fossil
2. UAB scientists discover the origin of a mysterious physical force
3. Researchers discover way to make cells in the eye sensitive to light
4. Protein discovery could unlock the secret to better TB treatment
5. Newly-discovered class of genes determines ?and restricts ?stem cell fate
6. Newly discovered virus linked to childhood lung disorders and Kawasaki disease
7. Purdue proves concept of using nano-materials for drug discovery
8. Scientists discover the cellular roots of graying hair
9. Researchers discover molecule that causes secondary stroke
10. Scientists discover unique microbe in Californias largest lake
11. New protein discovered by Hebrew University researchers
Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Paleontologists discover new mammal from Mesozoic Era

(Date:11/5/2014)... – Kelly Redmond has dedicated his career to ... to a general audience. , As deputy director ... Center at Nevada,s Desert Research Institute, Redmond has ... management, application and dissemination of climate data to ... Fall Meeting in San Francisco on December 15-19, ...
(Date:11/4/2014)... — Think about the way our bodies are assembled ... know that they are supposed to become a nerve ... find the correct place and alignment? Researchers at the ... , In a new study, UM researchers describe the ... surrounding neighbors, at the head-trunk region. Their discovery may ...
(Date:11/3/2014)... Research and Markets has announced the ... Markets and Companies" to their offering. ... which have already started to play an important role in ... the old fashioned bone marrow transplants. Role of cells in ... become a part of medical practice. Stem cells ...
Breaking Biology News(10 mins):Nevada climatologist to be honored at AGU Fall Meeting for lifetime of public outreach 2The inside story: How the brain and skull stay together 2Global Cell Therapy - Technologies, Markets and Companies: 2014 Report 2Global Cell Therapy - Technologies, Markets and Companies: 2014 Report 3
... CAMBRIDGE, Mass. -- About one-third of the human population is ... most of them don,t know it. Though Toxoplasma ... harmful to individuals with suppressed immune systems, and to fetuses ... are found in dirt and easily infect farm animals such ...
... cancer is the sixth most common type of cancer and ... women without any known risk factors. Now, researchers at Fox ... of precancerous cells in the mouth and thus promote the ... The new results, published in the January issue of ...
... Anatomist,s (AAA) will present its 2011 Young Investigator Awards ... in their respective fields and show remarkable promise of ... lecture at the AAA Annual Meeting during Experimental Biology ... Washington Convention Center, Washington, DC, Room 102A). ...
Cached Biology News:MIT researchers study the danger of toxoplasma parasites 2Estrogen may help precancerous cells spread in oral cavity 2American Association of Anatomists announces young investigator award winners 2
(Date:11/21/2014)... 2014 /CNW/ - Aequus Pharmaceuticals Inc. (the "Company" ... has closed a brokered private placement offering (the ... million.  Cormark Securities Inc. and Clarus Securities Inc. ... for a syndicate of agents that also included ... the "Agents"). Concurrently with the Brokered Offering, the ...
(Date:11/18/2014)... RPS Diagnostics (RPS®) – a developer ... its third annual partnership of the Centers for ... Antibiotics Week from November 17-23. , Get Smart ... to highlight the coordinated efforts of CDC, state ... partners to provide education about the importance of ...
(Date:11/18/2014)... November 18, 2014 Alanda Software, ... Transparency Reporting solutions, announced today that a top ... its Consummate Providerâ„¢ solution in both the U.S. ... Global, SaaS based, Data Quality remediation portal, designed ... third party Providers improve their ability to capture, ...
(Date:11/18/2014)... November 18, 2014 Array Architects is ... design expertise to the nation's hospitals and health systems. ... by those dedicating their careers to the advancement of ... contributor in her respective field, Laura Silvoy has been ... the 2014 Winter Simulation Conference. , Laura will ...
Breaking Biology Technology:Aequus Pharmaceuticals closes $4.2 million private placement financing 2Aequus Pharmaceuticals closes $4.2 million private placement financing 3RPS Again Partners with the CDC in Support of the 2014 Get Smart About Antibiotics Week 2RPS Again Partners with the CDC in Support of the 2014 Get Smart About Antibiotics Week 3Alanda Software Completes Successful Implementation of Global Data Quality & Vendor Management Solution for Top Tier Global Biopharmaceutical Company 2Array Healthcare Simulation Expert Slated to Speak at Winter Simulation Conference 2
... Inc. (Nasdaq: HOLX ) and Third Wave Technologies, ... of the initial,offering period of the tender offer by ... outstanding shares of common stock of,Third Wave. The initial ... City time, on Wednesday, July 16, 2008., The ...
... FASTA enable researchers to quickly and effectively use these invaluable resources. ... ... OpenHelix today announced the availability of new tutorial suites on ... FASTA . BLAST, from the National Center for Biotechnology Information ...
... -- China,Biologic Products, Inc. (OTC Bulletin Board: ... pharmaceutical companies in the People,s Republic,of China ... 2008, the Company was,awarded the Advanced Technology ... the Department of Foreign Trade and,Economic Cooperation ...
Cached Biology Technology:Hologic, Inc. Accepts Shares of Third Wave Technologies, Inc. in Tender Offer and Commences Subsequent Offering Period 2Hologic, Inc. Accepts Shares of Third Wave Technologies, Inc. in Tender Offer and Commences Subsequent Offering Period 3Hologic, Inc. Accepts Shares of Third Wave Technologies, Inc. in Tender Offer and Commences Subsequent Offering Period 4Hologic, Inc. Accepts Shares of Third Wave Technologies, Inc. in Tender Offer and Commences Subsequent Offering Period 5New Online Tutorials for Sequence Similarity Search Tools BLAST and FASTA 2China Biologic Products Honored with the Advanced Technology Certification for Foreign-Funded Enterprises 2China Biologic Products Honored with the Advanced Technology Certification for Foreign-Funded Enterprises 3
Ultra Pure Grade. Used in conjunction with IPTG to identify bacterial colonies that contain recombinant plasmids by blue/white selection. X-Gal forms an intense blue precipitate in the presence of be...
5-bromouridine 5'-triphosphate (BrUTP) *10 mM in TE buffer*...
...
in vitro Translation, Accessory Products...
Biology Products: