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Ancient fossils reveal how the mollusc got its teeth
Date:8/22/2012

oth and smaller teeth on the edges. The teeth would have moved round the end of a tongue in the conveyor-belt fashion seen in molluscs today, scooping food algae or detritus from the muddy sea floor. By establishing how the teeth were arranged, moved, grew, and were replaced, Smith was able to demonstrate that they formed a shorter and squatter forerunner to the modern radula.

"When I set out, I just hoped to be a bit closer to knowing what these mysterious fossils were," says Smith. "Now, with this picture of the earliest radula, we are one step closer to understanding where the molluscs came from and how they became so successful today."

The findings are reported this week in the paper "Mouthparts of the Burgess Shale fossils Odontogriphus and Wiwaxia: implications for the ancestral molluscan radula".


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Contact: Sean Bettam
s.bettam@utoronto.ca
416-946-7950
University of Toronto
Source:Eurekalert  

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