400 million year old fossilized jawless fish

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Article reads: Most living vertebrates are jawed vertebrates (gnathostomes), and the living jawless vertebrates (cyclostomes), hagfishes and lampreys, provide scarce information about the profound reorganization of the vertebrate skull during the evolutionary origin of jaws. The origin of a mouthful of jaws and teeth is one of the biggest steps in our evolutionary history but fossils have not provided any insights. Scientists from the Institute of Vertebrate Palaeontology and Palaeoanthropology (IVPP) and other internatonal agencies claim to have solved this scientific riddle by studying the brain of a 400 million year old fossilized jawless fish–an evolutionary intermediate between the living jawless and jawed vertebrates.

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