CAMBRIDGE, England, March 5 (UPI) -- A fossilized eel-like creature unearthed in Canada is the oldest life form found with a primitive spinal cord, making it man's earliest ancestor, experts say.
The species Pikaia gracilens is a precursor to vertebrates, which makes it the direct ancestor of all members of the chordate family, which includes fish, birds, reptiles, amphibians and mammals -- and humans, researchers say.