Neil Shubin of the University of Chicago presents his latest discovery: The rear portion of Tiktaalik roseae, a 375 million-year-old transitional species between fish and the first legged animals. This finding reveals that the evolution of hind legs actually began as enhanced hind fins and challenges existing theory that large, mobile hind appendages were developed only after vertebrates transitioned to land. The fossils are described online Jan 13 in the Proceedings of the National Academy of Sciences.
Credit: University of Chicago, Kevin Jiang
[ Read the Article: New Fish Fossil Reveals How Fins May Have Become Hind Limbs ]