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:11/4/2014)... November 4, 2014   ... growth   Fuel3D , a developer of ... funding round totaling $6.4 million (£4 million). This funding builds ... earlier this year and paves the way for the commercial ... The funding round was led by Chimera Partners and ...
(Date:11/3/2014)... Cancer Center study published in this month,s ... describes the activity of a recently discovered communication molecule ... It has been known to limit inflammation and the ... system: IL-37 inhibits the ability of the immune system ... mechanism that underlies IL-37,s effect on the immune system ...
(Date:11/2/2014)... LA (2 November 2014)—In support of a bold quest ... & Melinda Gates Foundation today announced an award of ... Vaccine Initiative (MVI) in building new vaccines that will ... realize the "accelerating to zero" agenda. Such vaccines would ... could be called an "immunological bed net." , ...
Breaking Biology News(10 mins):Fuel3D Secures $6.4 Million in Expansion Funding 2Fuel3D Secures $6.4 Million in Expansion Funding 3PNAS: From HIV to cancer, IL-37 regulates immune system 2New malaria vaccines to prevent infection and block transmission get a shot in the arm 2New malaria vaccines to prevent infection and block transmission get a shot in the arm 3New malaria vaccines to prevent infection and block transmission get a shot in the arm 4
(Date:11/22/2014)... 21, 2014 During his lifetime Richard ... need to surround himself with great people and take ... his friends often marveled at his extraordinarily courageous attitude ... life and -- even with his death impending—that’s how ... disease that would ultimately take his life. , Carrying ...
(Date:11/22/2014)... Frederick, MD (PRWEB) November 21, 2014 ... sample management solutions provider, has released Limfinity® version ... more installation projects of Limfinity® than ever in ... majority configuration and minority framework enhancement. Limfinity® version ... goes far above and beyond bug fixes! , ...
(Date:11/22/2014)... Grand Rapids, MI (PRWEB) November 22, 2014 ... the opportunity to simulate the proper management of ... training and test lung devices . Grand Rapids-based, ... Lung” plans to donate two of the respiratory ... $12,000 to $15,000 each. Grand Valley and Muskegon ...
(Date:11/21/2014)... LAVAL, Quebec , November 21, 2014 ... KLOX como responsable comercial   Mariano Rodríguez ... finanzas   KLOX está en marcha para ... tratamiento de cura de heridas de reciente aprobación en Europa ... o "la compañía") se complace al anunciar los siguientes nombramientos: ...
Breaking Biology Technology:Sherry Sharp, Wife of CarMax Founder, Richard Sharp, Accepts Seat on Board of Cure Alzheimer’s Fund 2Sherry Sharp, Wife of CarMax Founder, Richard Sharp, Accepts Seat on Board of Cure Alzheimer’s Fund 3RURO Announces Limfinity® version 5.1.4 2Michigan Instruments Donates Two Respiratory Simulation Training and Test Lung (TTL) Devices to Grand Valley State University 2Michigan Instruments Donates Two Respiratory Simulation Training and Test Lung (TTL) Devices to Grand Valley State University 3KLOX Technologies anuncia sus nombramientos ejecutivos 2KLOX Technologies anuncia sus nombramientos ejecutivos 3KLOX Technologies anuncia sus nombramientos ejecutivos 4KLOX Technologies anuncia sus nombramientos ejecutivos 5
Cached News: