Fossil Fish Tiktaalik roseae
The 375 million-year-old fossil fish Tiktaalik roseae, a large aquatic predator with flattened head and body, represents an important intermediate step in the evolutionary transition from fish to animals that walked on land. Results from a research study funded by the National Science Foundation show that the transition from aquatic to terrestrial lifestyle involved complex changes not only to appendages (fins to limbs) but also to the internal head skeleton.
This image accompanied NSF press release, "Details of Evolutionary Transition from Fish to Land Animals Revealed."
Credit: Zina Deretsky, National Science Foundation
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