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We were having a discussion on the validity of Nanotyrannus Here, and I have a question for all you theropod tooth collectors. Many say that Nanotyrannus lancensis is a adolescent Tyrannosaurus rex. Now some here have many teeth from both. Nanotyrannus has gracile, thinner teeth, whereas tyrannosaurus has robust, thick teeth. If N. Lancensis is a juvenile form, than we should expect to see a transition in teeth from slender to thick. In other words, a spectrum of teeth. Do any of you collectors have this represented in your collection? Or a transitional tooth? Please do post pictures. Now it is possible that there is one day a sudden change from one form to the other, but I’ve not seen anything to indicate that to be the case (if you do please share it). I will I’ll add I don’t have any of either teeth, and this is purely to satisfy my curiosity.