From the mouths of molluscs -- ancient snail relative
found, Physorg, August 22, 2012
http://phys.org/news...ient-snail.html
Ancient Fossils Reveal How the Mollusc Got Its Teeth
ScienceDaily, August 22, 2012
http://www.scienceda...20822125212.htm
Odontogriphus - http://en.wikipedia.org/wiki/Odontogriphus
Wiwaxia - http://en.wikipedia.org/wiki/Wiwaxia
The paper is:
Smith, M. R., 2012, Mouthparts of the Burgess Shale
fossils Odontogriphus and Wiwaxia: implications for
the ancestral molluscan radula. Proceedings of the
Royal Society B: Biological Sciences. Published online
before print August 22, 2012.
http://rspb.royalsoc.../rspb.2012.1577
Best wishes,
Paul H.