Navigation Links
The peculiar feeding mechanism of the first vertebrates
Date:5/19/2011

This release is available in French and German.

Jaws made of bone are commonplace in the animal kingdom. However, how jaws developed in the course of evolution is still a mystery. Under the direction of paleontologist Nicolas Goudemand, a team of researchers from the University of Zurich and the European Synchrotron Radiation Facility set about solving this puzzle. Living and extinct jawless animals can yield clues as to the development of the jaw. The researchers studied fossilized conodonts extinct, eel-shaped animals whose precise relationship with the actual vertebrates is still a matter of debate. For their project, which was funded by the Swiss National Science Foundation and just published in the American journal PNAS, the researchers analyzed new conodont fossils that date from around the biggest mass extinction event at the boundary between the Permian and Triassic periods.

Multitasking thanks to teeth on upper lips and tongue

In some of these new fossils discovered in China, the researchers noticed several conjoined tooth-like structures that occupied an unusual position in the mouth. Based on this discovery and the re-evaluation of other unusually constructed conodont feeding apparatus, the scientists developed a 3D animated model that shows how conodonts fed: most conodonts had to have two upper lips, upon each of which there was a long, fang-like structure. The conodonts also had a kind of tongue bearing a complex set of spiny or comb-like 'teeth'. The 'tongue' rested on pulley-like cartilage and could be moved backwards and forwards thanks to two opposing muscles. The conodonts used the 'tongue' and lips to grab food before two pairs of relatively robust, sometimes molar-like 'throat teeth' ground and cut it up.

Similarity with lampreys

The conodonts' unique feeding mechanism is fairly similar to that of the extant lamprey, which is widely regarded as the extinct conodonts' nearest relative. The new findings confirm that conodonts are to be considered primitive vertebrates from an evolutionary point of view. Moreover, due to the comparative feeding mechanism and other similarities, lampreys and conodonts must have a common ancestor which was one of the first vertebrates. This common ancestor must also have had a tongue mounted on pulley-like cartilage and therefore eaten in the same manner as the conodonts.


'/>"/>

Contact: Dr. Nicolas Goudemand
goudemand@pim.uzh.ch
41-044-634-2698
University of Zurich
Source:Eurekalert  

Related medicine news :

1. Too Many With End-Stage Dementia Get Feeding Tubes
2. Breast-Feeding Helps Mom Stay Slimmer Later in Life
3. Breastfeeding protects children against peptic ulcer bacterium
4. Statement from Vicki Escarra, President and CEO, Feeding America, on the Child Nutrition Reauthorization Draft Legislative Proposal
5. Long-Term Breast-Feeding Tied to More Aggressive Cancers
6. Feeding America's David Arquette and Courteney Cox Team Up With the National Association of Letter Carriers to Stamp Out Hunger™
7. Black Women in U.S. Comfortable With Formula Feeding
8. Wider Breast-Feeding Could Save Babies Lives
9. Is Fear of Being Caught Naked an Obstacle to Increasing Breastfeeding Rates?
10. Are dead cancer cells feeding cancers spread?
11. Antiretrovirals During Breast-Feeding Shield Babies From HIV, Study Shows
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
The peculiar feeding mechanism of the first vertebrates
(Date:5/25/2016)... ... 2016 , ... HealthPostures , a national ergonomics manufacturer ... at the American Society of Safety Engineers Conference in Atlanta, Georgia. The four-day ... speakers and exhibitors from more than 40 countries are scheduled to appear at ...
(Date:5/25/2016)... (PRWEB) , ... May 25, 2016 , ... ... due to popular demand for minimally invasive, endoscopic spine surgeries in the Montgomery ... will begin seeing patients in the Germantown office of American Spine every Monday. ...
(Date:5/24/2016)... ... May 24, 2016 , ... Sterling Global Products is launching a Kickstarter ... refillable hanging wipe dispenser. The campaign kick-off video is located via this link ... 2016. The goal is to raise $1,000 per day for a total of $25,000. ...
(Date:5/24/2016)... Milwaukee, WI (PRWEB) , ... May 24, 2016 ... ... has announced that Rudolfo (Rudy) Cifolelli has joined the company as Vice President ... and the development of U.S. and international sales in the rapidly expanding field ...
(Date:5/24/2016)... ... May 24, 2016 , ... Fire Door Solutions, headquartered in ... from start to finish, for Life Safety compliance. These expanded services include ... by the Joint Commission, and fire stopping reviews, inspections, and repairs. Clients ...
Breaking Medicine News(10 mins):
(Date:5/25/2016)... CAMBRIDGE, England , May 25, 2016 /PRNewswire/ ... genomics company employing the precision of circulating tumour ... oncology, today announces the appointment of Professor ... will provide medical leadership across the clinical development ... that Inivata,s products help deliver significant improvements in ...
(Date:5/24/2016)... , May 24, 2016 ... beide primären Endpunkte und ... Überlegenheit in ‚ausgezeichneter plus guter ... Colons    ,      (Logo: ... gab heute neue positive Daten von der MORA-Studie ...
(Date:5/24/2016)... , May 24, 2016  NxStage Medical, Inc. (Nasdaq: ... focused on advancing renal care, today announced that ... participate in the following schedule of investor conferences. Where ... available at http://ir.nxstage.com/ .   ... Healthcare Conference NY, NY           Friday, June 10, 2016 ...
Breaking Medicine Technology: