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Science 21 February 2003:
Vol. 299. no. 5610, p. 1164
DOI: 10.1126/science.299.5610.1164a
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News of the Week

PALEONTOLOGY:
Primitive Jawed Fishes Had Teeth of Their Own Design

Erik Stokstad

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.

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