#タタンカケラトプス

[mesozoicmarket]

A rooted dinosaur tooth of a triceratopsin, a Triceratops sp. or Torosaurus latus from the Hell Creek Formation in Powder River County, Montana, United States. Teeth of these chasmosaurine ceratopsids are unfortunately indistinguishable. Derived ceratopsians are known for their double root while more early diverging species like Leptoceratops gracilis only have one; in this specimen, the second root had been broken off. There are currently 3 or 4 triceratopsins described, Triceratops horridus, Triceratops prorsus, Torosaurus latus, and the possibly dubious Tatankaceratops sacrisonorum.