Separate evolutionary origins of teeth from evidence in fossil jawed vertebrates.

  title={Separate evolutionary origins of teeth from evidence in fossil jawed vertebrates.},
  author={Moya Meredith Smith and Zerina Johanson},
  volume={299 5610},
Placoderms are extinct jawed fishes of the class Placodermi and are basal among jawed vertebrates. It is generally thought that teeth are absent in placoderms and that the phylogenetic origin of teeth occurred after the evolution of jaws. However, we now report the presence of tooth rows in more derived placoderms, the arthrodires. New teeth are composed of gnathostome-type dentine and develop at specific locations. Hence, it appears that these placoderm teeth develop and are regulated as in… CONTINUE READING

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