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Showing results for tags 't rex serrations'.
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Identification: This tooth was sold as being from a Dromaeosaur. The serrations' shape and their similarity on both carinae say otherwise. In the Hell Creek Formation, there are potentially two Tyrannosaur species. If Nanotyrannus is invalid, then this is automatically a T. rex tooth. For those who consider Nanotyrannus to be valid, this tooth is still T. rex based on the robustness of the tip and serrations, and the CHR (Crown Height Ratio). Tyrannosaurus maxillary teeth may still have minor basal compression, as this one does. This is from a juvenile animal based on its small size and feeding wear (thus it's not a germ tooth). Thanks to @Troodon and @hxmendoza for their help with identification. I also contacted Christophe Hendrickx, who also said it was from a young T. rex. Other: Mesial Serration Density: ~ 4 serrations / mm. Distal Serration Density: ~ 4 serrations / mm. Note: Serration density alone is not an identifying feature of Tyrannosaur teeth this small. This tooth is from the right maxilla based on the wear on the lingual face. Feeding wear is also visible on some of the serrations. Citation: OSBORN, HENRY, 1905. Tyrannosaurus and other Cretaceous carnivorous dinosaurs, Bulletin of the AMNH, Volume 21, Article 14, Pages 259-265, https://digitallibrary.amnh.org/handle/2246/1464
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- c(hc)tr3
- hell creek
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From the album: Dinosaurs
Comparison of Tyrannosaur denticles (serrations) from the Hell Creek Formation. All of the images are set to the same scale Some differences are likely associated with position in the mouth and/or feeding wear. So, this may not be a perfect illustration of purely ontogenetic variation. The adult T. rex denticles are from an unknown position and carina (being from a tooth fragment), the juvenile T. rex denticles are from the distal carina of a right (rear?) maxillary tooth, and the infant T. rex denticles are from the distal carina of a posterior tooth. The Nanotyrannus denticles are also from the distal carina of a posterior(?) tooth. The Nanotyrannus denticles are noticeably different. That could be because of lack of wear, age of the animal, because it may be a different species, or a combination thereof.-
- hell creek
- nanotyrannus lancensis
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From the album: Dinosaurs
Tyrannosaurus rex Hell Creek Formation Garfield Co., MT, USA Note: From the right maxillary of a juvenile animal, but still has adult qualities like a robust tip and denticles.-
- hell creek
- juvenile t rex
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From the album: Dinosaurs
Tyrannosaurus rex Hell Creek Formation Garfield Co., MT, USA Note: Juvenile animal-
- hell creek
- t rex
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(and 2 more)
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From the album: Dinosaurs
Tyrannosaurus rex Hell Creek Formation Garfield Co., MT, USA Note: Juvenile animal-
- hell creek
- t rex
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(and 2 more)
Tagged with: