Jawless fish brains more similar to ours than previously thought

(RIKEN) Researchers at the RIKEN Evolutionary Morphology laboratory and other institutions in Japan have shown that complex divisions in the vertebrate brain first appeared before the evolution of jaws, more than 500 million years ago. Published in Nature, the study shows that two elements of brain genoarchitecture thought to be unique to jawed vertebrates are actually present in two jawless fish -- the hagfish and lamprey.