News of the WeekPaleontology

Primitive Jawed Fishes Had Teeth of Their Own Design

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Science  21 Feb 2003:
Vol. 299, Issue 5610, pp. 1164
DOI: 10.1126/science.299.5610.1164a

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On page 1235, researchers present evidence that teeth evolved independently in a group of extinct jawed fishes called the placoderms, not just once, in the common ancestor of jawed vertebrates, as has been assumed. The finding doesn't reveal how teeth came about, but if they evolved more than once, scientists may need to shake up a significant portion of the vertebrate family tree.