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I added this Timurlengia euotoca tooth to my collection.  The question I have is this a Tyrannosaur or Tyrannosaurid tooth.  I ask that because the serrations are very fine and it's compressed unlike any other Tyrannosaurids  I've seen in North America.

Thanks

   

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Most sellers and collectors call this a tyrannosaur or tyrannosaurid tooth.  The reality is its not a Tyrannosaurid, that includes T-rex, Albertosaurus, Gorgosaurus, Daspletosaurus etc.  Probably why its teeth are very different.   Its placements is uncertain and currently under the superfamily Tyrannosauroidea.  Its a small to mid theropod with a long snout that may eventually be a sister family to Tyrannosaurids but that for paleontologists to determine with new discoveries.   Dont get hung up with placements its normal for species to be reassigned with new discoveries 

 

Paper

http://www.pnas.org/content/early/2016/03/08/1600140113

 

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You have a tyrannosaur tooth, which is a short-form/informal for Tyrannosauroidea, the broad superfamily of T. rex, Dilong, Alectrosaurus and other related dinosaurs. But it's not a tyrannosaurid which specifically refers to Tyrannosauridae such as T. rex, Nanotyrannus, Daspletosaurus and other closely-related dinosaurs.

 

This would be a better read:

 

Tyrannosaur = Tyrannosauroidea > https://en.wikipedia.org/wiki/Tyrannosauroidea
Tyrannosaurid = Tyrannosauridae > https://en.wikipedia.org/wiki/Tyrannosauridae

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