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Showing results for tags 't rex'.
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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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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. -
From the album: Dinosaurs
Tyrannosaurus rex Hell Creek Formation Garfield Co., MT, USA Note: Juvenile animal -
From the album: Dinosaurs
Tyrannosaurus rex Hell Creek Formation Garfield Co., MT, USA Note: Juvenile animal -
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. -
From the album: Dinosaurs
Right maxillary tooth from a juvenile animal.- 1 comment
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Tyrannosaurus tooth effectively?
Josesaurus rex posted a topic in Is It Real? How to Recognize Fossil Fabrications
Hello, seen another tooth, this time it is a fragment of the tip, according to the seller, it is from the Hell Creek Formation, South Dakota. Sorry for the poor quality of the images, but I'm uploading them from my cell phone. As soon as I can, I will replace them with better quality ones. I would appreciate any comments from you.
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Dinosaur tooth. Gorgosaur? Nanotyrannus? T-rex?
Josesaurus rex posted a topic in Is It Real? How to Recognize Fossil Fabrications
Hello again. I saw this tooth on the internet, I don't know what dinosaur it could be from. In the description of the publication it does not say anything, only that it is from the theropod and from the United States. I suspect it is from a tyrannosaurid, but which one? I don't know. Gorgosaurus? or T rex? There is no further information on the origin or training where it was obtained. What do you think it could be? I know that with so little data not much can be done, but I would like to know the opinions or suggestions that you have on this matter anyway, so that I can have a better idea and decide whether to buy it or not.
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A couple of days ago there was a thread that provided links to @Troodon 's id posts about identifying tyrannosaurid teeth. I didn't bookmark them and can't locate them. Any guidance would be appreciated. Thanks.
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From the album: Dinosaurs
A high-quality replica of Stan's posterior right dentary tooth. About 4.5" in length. -
From the album: Dinosaurs
Two teeth from Tyrannosaurus rex at different growth stages. The adult is a replica of a posterior right dentary tooth of Stan. The baby/juvenile is also a posterior tooth (about 6 mm long), found in the Hell Creek Fm. (more info: http://www.thefossilforum.com/index.php?/collections-database/chordata/dinosaurs/baby-t-rex-tooth-r1992/). It could also be a dentary tooth based on the wear patterns, but I'm not sure. -
T. rex posterior dentary tooth mesial carina
ThePhysicist posted a gallery image in Member Collections
From the album: Dinosaurs
Posterior dentary tooth replica from Stan the T. rex (11th from front). Note there is a slight "twist" of the mesial carina in this specimen. -
T. rex posterior dentary tooth distal carina
ThePhysicist posted a gallery image in Member Collections
From the album: Dinosaurs
Posterior dentary tooth replica from Stan the T. rex (11th from front). -
Hello! I got this tooth as a Christmas present, and to me it looks like a T.rex tooth, but the shape of the base made me less sure. I was hoping someone could help get a accurate id. The tooth is 10/16 of an inch long, and was found in Garfield county Montana.It has similar serrations on both sides, so I thought it was a tyrannosaur tooth. The shape, lack of pinching at the base, and thickness made me think it was T.rex, and the base looked to me like it could be a maxillary tooth since it was more rectangular than oval, but I wanted to see if anyone thought it looked more like a Nanotyrannus tooth. I can take any more pictures that would be helpful. Merry Christmas!
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From the album: Dinosaurs
Posterior baby/juvenile T. rex tooth. Hell Creek Formation Carter Co., MT, USA Fossil in TFF collections: http://www.thefossilforum.com/index.php?/collections-database/chordata/dinosaurs/baby-t-rex-tooth-r1992/ This tooth is also very similar to a few in the collection of @Troodon: http://www.thefossilforum.com/index.php?/topic/57402-my-jurassic-park-hell-creeklance-tyrannosaurs/-
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Identification: Originally listed as a Dromaeosaurid tooth, I suspected it was from a Tryannosaurid. Upon receiving the tooth, I contacted a few paleontologists to get expert opinions. Their conclusion was that the tooth was likely from a baby/juvenile Tyrannosaur. Since the only Tyrannosaurs in the Hell Creek Formation are Tyrannosaurus rex and Nanotyrannus lancensis (or only T. rex if N. lancensis is a young T. rex), and considering the cross-section of the base of the tooth, this must be from a baby Tyrannosaurus rex. This tooth shares many qualities with adult teeth, a fact which the experts used to justify their identification. The large denticles (serrations) on both carinae (cutting edges) are similar in shape and size, there's virtually no recurvature, no twisting of the carinae, and it has an oval base. The overall shape of the tooth also suggests that it's from the posterior region of the mouth. Among the attached photos are juxtapositions with a high-quality cast replica of an adult T. rex (Stan) posterior tooth, and a juvenile N. lancensis tooth (also from the Hell Creek Formation). Other: Mesial Serration Density: ~ 5.5 - 6 serrations / mm Distal Serration Density: ~ 5 - 5.5 serrations / mm Note: Serration density alone is not an identifying feature of Tyrannosaur teeth this small. Identifiers: The people that support this identification are: @Troodon (experienced and knowledgable collector on TFF); Dr. Philip J. Currie (noted paleontologist, museum curator, and professor specializing in Tyrannosaurs); Dr. David DeMar Jr. (research associate in the Department of Paleobiology of the National Museum of Natural History, Smithsonian Institution); and Dr. Christophe Hendrickx (postdoctoral researcher specializing in the evolution of theropod dentitions). 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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I originally came up with this idea after thinking of making a video about Stan the T rex but then decided to try to build a full fledged model of a T rex. Since I have no modeling experience at all,I decided to build it in a pretty popular game,notice one block equals to 12.666cm. After finishing it it looked familiar but not the typical t rex type,if anyone would have any suggestions feel free to tell me.Also tell me if it looks like another theropod cause this is reminding me of something else
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is this juvenile t rex skeleton real?
Josesaurus rex posted a topic in Is It Real? How to Recognize Fossil Fabrications
Hi, I have now corrected my previous post to avoid breaking the rules. I saw this recently and it actually seems too good to be true. I suspect that it may be false, as the stone that contains it does not look very natural in color, although the skeleton looks quite good. if you could comment on that it would be great.
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From the album: Dinosaurs
To me, serrations are such a fascinating tool. They were independently evolved many times in many different animals. They concentrate force into smaller points (increasing the pressure = Force/Area) so that the thing being bitten would break or cut along the line of serrations. They also are great for "sawing" through things such as muscle. T. rex definitely made great use of this adaptation. Topmost (greyscale) image from "Physical evidence of predatory behavior in Tyrannosaurus rex:" https://www.researchgate.net/publication/249649164_Physical_evidence_of_predatory_behavior_in_Tyrannosaurus_rex Most of the pictures (color) in this collage are from two associated fragments of what I am certain was a T. rex tooth from the Hell Creek Fm., SD based on the size and shape of the serrations. The images with the scale markings have been scaled to match each other. More on theropod serrations: "Developmental and evolutionary novelty in the serrated teeth of theropod dinosaurs:" https://www.nature.com/articles/srep12338 -
From the album: Dinosaurs
Closeup shot of the distal serrations. -
From the album: Dinosaurs
A high-quality replica of Stan's 2nd maxillary tooth. About 11.5" in length. Displayed with a 3D-printed stand I designed.- 4 comments
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From the album: Dinosaurs
A small piece of (probably) rex tooth from the Lance Creek Fm., WY. Shown next to a replica for comparison. -
Hi all! I just obtained an 8 mm juvenile T. rex tooth and have compared it to my 13 mm juvenile nanotyrannus tooth. Even though they are located in different positions in the jaw, there is a remarkable difference in the two teeth. I just don’t understand how these cannot be two different species?! The debate goes on...
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Hi All, This is suppose to be a hadrosaur toe bone that has evidence of predation. Looks like big claw gashes, maybe ungal claws from a Rex? Please comment on your thoughts? Enjoy!
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Well the Tuscon fossil show is just a few days away and I'm already getting calls from sellers wanting to get together this weekend. Hopefully the show will be full of cool displays and will pass on a few of those images next week. But here we are week 3 in the new year so lets begin with this weeks show. An almost complete hatchling specimen of the basal sauropodomorph Mussaurus patagonicus from the MacnVp colletion in Argentina. This specimen is from the Early Jurassic of the Argentinian Patagonia Courtesy, Bernardino Rivadavia Natural Sciences Argentine Museum Skull is in top right. A couple of photos of the T rex Scotty Now this is a T rex tooth, one of the best I've seen and gotta like its size Femur Another T rex specimen this one Burke's Museum... they say " can you believe that the humerus (upper arm bone) of a T. rex is nearly the same size as yours? " Pretty rare specimen, not a lot around From the NHM Dino lab The weird Triassic herbivore Pisanosaurus in the PVL collections. Based on a single partial skeleton discovered in the Ischigualasto Formation of the Ischigualasto-Villa Unión Basin in northwestern Argentina Also from the NHM Dinolab : Coloradisaurus is a genus of massospondylid sauropodomorph dinosaur. It lived during the Late Triassic period in what is now La Rioja Province, Argentina. It is known from the holotype PVL 5904, nearly complete skull. The recently-named Cryodrakon boreas was one of the largest-ever flying animals, with an estimated 10-meter wingspan. This tibia contains a tooth left behind by a scavenging dromaeosaur. Courtesy Royal Tyrrell Museum. Now thats a cool specimen... These beautiful feet belong to a nearly complete specimen of Saurornitholestes, from Alberta. Courtesy Mark Powers
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