I noticed a number of online suppliers offering Troodon teeth that actually belong to the genus Pectinodon.   Thought it would be a good discussion item for a focused post since they can get confusing with the various morphologies of Pectinodon teeth.   I'll use publications to illustrate my points and reflect all Campanian & Maastrichtian age teeth of North America.   (Edit) A new paper published late in 2017 has turned this taxon upside down.    I will try to reflect those c