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:6/24/2015)... 22, 2015 Research ... of the "Huawei Ascend Mate 7 Fingerprint ... their offering. Huawei,s technological choice for ... direction than Apple,s and Samsung,s one. The Ascend ... by Fingerprint Cards, a main actor in capacitive ...
(Date:6/23/2015)... MINNETONKA, Minn. , June 23, 2015 /PRNewswire/ ... technology company that supports the entire spectrum of ... iMedNet ™ , the company,s ... has been awarded a Silver 2015 Stevie® Award ... the Health Products & Services Website category.  The ...
(Date:6/23/2015)... , June 23, 2015   Valencell, ... announced the results of a recent study that ... on the wrist during activity. In a study ... was compared along with the Apple Watch against ... measuring heart rate during activity. The study demonstrated ...
Breaking Biology News(10 mins):Huawei Ascend Mate 7 Fingerprint Sensor - Reverse Costing Analysis 2MedNet Solutions' iMedNet eClinical Wins Silver Stevie Award 2Valencell Delivers Breakthrough Heart Rate Accuracy on the Wrist 2Valencell Delivers Breakthrough Heart Rate Accuracy on the Wrist 3
(Date:7/1/2015)... ... ... Apex Therapeutics announced today that company CEO, David Broecker provided a company ... presentation took place on Tuesday, June 16 and provided an update on the achievement ... treatment of pancreatic cancer. A copy of the company overview can be found ...
(Date:6/30/2015)... , ... June 30, 2015 , ... ... 12 to take part in the first half of “Integrative Biotechnology,” an applied ... partnership established in summer 2014, this course combines students from both universities and ...
(Date:6/30/2015)... , June 30, 2015  Juniper Pharmaceuticals, ... focused on developing therapeutics that address unmet medical ... George Elston will present at the ... Wednesday, July 8, 2015Time: , 4:45 PM EDTLocation: ... (live & archive): , www.juniperpharma.com, under  ,Investor, ...
(Date:6/30/2015)... , ... June 30, 2015 , ... ... to the federal government, announced in a paper published this week in the ... potential problem with the diagnostic techniques currently used to detect the Ebola virus. ...
Breaking Biology Technology:Apex Therapeutics Presented Company Overview at This Year’s BIO International Convention in Philadelphia, PA 2Rivier University and Beijing City University Academic and Cultural Exchanges Begin 2Juniper Pharmaceuticals to Present at Cantor Fitzgerald Inaugural Healthcare Conference on July 8, 2015 2Noblis and Government Scientists Identify New Genomic Signatures of Ebola Using Whole Genomic Sequencing and Innovative BioVelocity Analytics Tool 2Noblis and Government Scientists Identify New Genomic Signatures of Ebola Using Whole Genomic Sequencing and Innovative BioVelocity Analytics Tool 3Noblis and Government Scientists Identify New Genomic Signatures of Ebola Using Whole Genomic Sequencing and Innovative BioVelocity Analytics Tool 4
Cached News: