More about our friend, Tiktaalik
A new study done on the transitional fossil Tiktaalik has revealed more of the intermediate steps by which some marine vertebrates evolved into land animals.
One of the most intriguing findings, scientists said, was the reduction in size of a bony element that, in fish, links the braincase, palate and gills and is associated with underwater feeding and respiration. In more primitive fish, the bony part of what is called the hyomandibula is large and shaped like a boomerang. In this fossil species, the bone was greatly reduced, no bigger than a human thumb.
You can read more in the NY Times.