HOME >> BIOLOGY >> NEWS
New Arctic fossils fill evolutionary gap between fish and limbed animals

PHILADELPHIA -- The recent discovery above the Arctic Circle of remarkably well preserved fossils from a new species of ancient fish provides a key marker in the evolutionary transition of fish to limbed animals.

In two related articles highlighted on the April 6 cover of the journal Nature, Dr. Ted Daeschler of The Academy of Natural Sciences in Philadelphia, co-leader of the expedition to Ellesmere Island, and his colleagues announced the discovery of 375-million-year-old fossils with numerous features that place them squarely at the evolutionary transition from fish to limbed animals. The new species has a skull, neck, ribs and part of a fin like the earliest limbed animals, but also has fins and scales like a fish.

The new species, named Tiktaalik roseae, shows that the evolution from life in water to life on land happened gradually in fish living in shallow water.

For about a century, scientists have been able to trace the broad outline of the millions-of-years-long transition of lobe-finned fish to limbed animals (tetrapods). The new find, however, is the most compelling evidence yet of an animal that was on the verge of the transition from water to land. "The find is a dream come true," said Daeschler, the Academy's curator of vertebrate biology. "We knew that the rocks on Ellesmere Island offered a glimpse into the right time period and were formed in the right kinds of environments to provide the potential for finding fossils documenting this important evolutionary transition."

Tiktaalik was a predator with sharp teeth, a crocodile-like head, and a flattened body that lived in what was then a subtropical climate. The quality of the fossils allowed the team to examine the joint surfaces on many of the fin bones and figure out that shoulder, elbow and wrist joints were capable of supporting the body like limbed animals. "Tiktaalik blurs the boundary between fish and land animals," said Dr. Neil Shubin of the University of Chi
'"/>

Contact: Carolyn Bealrdo
belardo@acnatsci.org
215-299-1043
The Academy of Natural Sciences
5-Apr-2006


Page: 1 2 3

Related biology news :

1. Arctic Observing Network as a tool for understanding Arctic change
2. 1,000-year-old Arctic ponds disappearing due to global warming
3. Global warming is evaporating Arctic ponds, new study shows
4. Arctic spring comes weeks earlier than a decade ago
5. Study helps preserve Arctic whale, Eskimo subsistence hunt
6. Arctic ice retreating more quickly than computer models project
7. Worldwide research network needed to really understand what is changing in the Arctic
8. Scientists discover new life forms in the Arctic Ocean
9. Understanding the Arctic -- NSF-funded expeditions cover new ground in climate science
10. Methane devourer discovered in the Arctic
11. Continued warming of the Arctic Ocean

Post Your Comments:
(Date:7/21/2014)... A University of California, San Diego School of Medicine-led ... not recognize the potentially serious health consequences of childhood ... in helping their child reach a healthy weight. , ... of the Academy of Nutrition and Dietetics . , ... and physical activity behaviors," said lead author Kyung Rhee, ...
(Date:7/21/2014)... cheating in science are among the topics to ... experts in Montreal at the three International Union ... to August 1, 2014. Some 2,000 participants from ... 14th International Congress of Bacteriology and Applied Microbiology, ... Microbiology, and the 16th International Congress of Virology. ...
(Date:7/21/2014)... 154 hotspots in areas across Riau province on Sunday, ... again following a decline in rainfall. The number ... than what had been reported one day prior, which ... scattered in six regencies and municipalities, most of which ... related haze it creates could potentially spread via winds ...
Breaking Biology News(10 mins):Parents rank their obese children as 'very healthy' 2Montreal hosts International Union of Microbiology Societies congresses 2
(Date:7/22/2014)... CTD Holdings, Inc. (OTCQB:CTDH), a manufacturer ... cosmetics, and other markets, announced today that it has ... qualified private investors led by Novit L.P., an investment ... transaction involved the signing of a Securities Purchase Agreement ... Stock at a price per share of $1.00, resulting ...
(Date:7/22/2014)... 22, 2014 Automated cell culture systems ... of cell culture. They allow production of optimum cells ... researchers in drug discovery and industries and biopharmaceutical companies. ... production, iPSC research, cryobanking, cell-based assays, and cellular expression ... , Analysts forecast the Global Cell Culture market ...
(Date:7/22/2014)... Wisconsin (PRWEB) July 22, 2014 ... in attendance at the 2014 NCSL International Workshop ... Booth #423 will feature CONDEC pressure instrumentation, OIML ... weights, and the new, customized sets, Essential Weights™. ... to promote cooperative efforts in solving the common ...
(Date:7/22/2014)... (PRWEB) July 22, 2014 The ... clear and concise visual representation of history, migration, and ... was always regaled by family history stories stemming from ... as the "old country." Pictures and 8mm home movies ... side of the family, and Steve ordered a test ...
Breaking Biology Technology:CTD Holdings Closes $1.725 Million Private Placement 2CTD Holdings Closes $1.725 Million Private Placement 3Global Cell Culture Market to Grow at 10.27% CAGR by 2018 Forecasts a New Research Report ReportsnReports.com 2Global Cell Culture Market to Grow at 10.27% CAGR by 2018 Forecasts a New Research Report ReportsnReports.com 3Global Cell Culture Market to Grow at 10.27% CAGR by 2018 Forecasts a New Research Report ReportsnReports.com 4Rice Lake Weighing Systems Showcases Metrology Solutions for the 2014 NCSL International Workshop & Symposium 2DNA Test from DNA Spectrum Shows Heritage Like a Map of the Past 2DNA Test from DNA Spectrum Shows Heritage Like a Map of the Past 3DNA Test from DNA Spectrum Shows Heritage Like a Map of the Past 4
Cached News: