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New fossils fill the evolutionary gap between fish and land animals

that produced the Tiktaalik fossils were left by stream systems meandering across wide floodplains.

"This kind of shallow stream system seems to be where many features of land-living animals first arose," said Ted Daeschler of the Academy of Natural Sciences in Philadelphia. "The species shows that evolution from life in water to life on land happened gradually in fish in shallow water."

The skeletal structure of Tiktaalik and the nature of the deposits where it was found suggest an animal that lived on the water bottom, in the shallows, and perhaps even out of the water for short periods.

"The skeleton of Tiktaalik indicates that it could support its body under the force of gravity whether in very shallow water or on land," said Farish Jenkins of Harvard University. "This represents a critical early phase in the evolution of all limbed animals, including us."

The project was also funded by the National Geographic Society, an anonymous donor, and the researchers' institutions. The team also relied on geological mapping by the Geological Survey of Canada.


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Contact: Cheryl Dybas
cdybas@nsf.gov
703-292-7734
National Science Foundation
6-Apr-2006


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