How the Mollusks Got Their Teeth

From SciNews:

University of Toronto graduate student Martin Smith has for the first time reconstructed mouthparts of two mollusk-like animals Odontogriphus and Wiwaxia that lived in Cambrian seas 500 million years ago.

Illustration: Wiwaxia corrugata (Matthew, 1899)
Lophotrochozoa
Halwaxiida
Wiwaxiidae

Cambrian
Burgess Shale
British Columbia, Canada 

under a Creative Commons 3.0 Unported (CC BY-NC-ND 3.0)