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Found 68 results

  1. A response to Woodward et. al 2020's refutation of Nanotyrannus. Argues that specimens BMRP 2002.4.1 and BMRP 2006.4.4 fall outside the growth curve of Tyrannosaurus. https://advances.sciencemag.org/content/6/1/eaax6250/tab-e-letters
  2. Hi all, I could not resist and purchased this tooth knowing it would be a tough call to make. It was found in the Hell Creek Fm. The big problem is the worn down mesial carina, there are however some remnant denticles I could measure, but not midline – more posterior. Taking them into consideration the tooth has distal 4.5 denticles per mm and mesial 6 per mm. The other measurements are: CH 1.47 cm / CBL 0.74 cm / CBW 0.39 cm. Based on this and the oval base I am leaning towards Dakotaraptor but might as well be a specific T-Rex tooth position.? I really need someone more experienced to take a look please. Any help is highly appreciated.
  3. Hello, I was doing a study on the T. rex and Nanotyrannus teeth specimens I had, and I wanted to compare them against a list of known T. rex teeth with measurement. The paper: Dental Morphology and Variation in Theropod Dinosaurs: Implications for the Taxonomic Identification of Isolated Teeth (JOSHUA B. SMITH, DAVID R. VANN, AND PETER DODSON) contains a list of 115 T. rex teeth. To make it easier to compare and read the data, I combined the measurements into a single chart, added colors and lines for ease of reading, and added the size and names of the T. rex used in the study Feel free to refer to the below chart for T. rex teeth measurements. I had to split the chart into 2 due to size limitations, but if you want the full-sized PDF version (25 MB), please message me so I can send it to you by email. If you have any suggestions to improve readability, or have your own data to add, go ahead and post it here! I will be posting pics and measurements of my various T. rex and Nanotyrannus teeth here @Troodon
  4. Nanotyrannus?

    I'd quite like to add a new theropod tooth to my collection. I saw these three for sale, just wondering if they are Nano/theropod as described and not, say, raptor teeth. Thanks Pictures 1 - 3 is 0.56 inch. This has a more oval base, does this mean it's not nano? Because aren't there teeth more rectangular with an indented middle? Pictures 4 and 5 is 0.47 inch -- No pictures of base for this one. Pictures 6 and 7 is 1.06 inch long, but has a repaired tip and is in matrix. Any help will be great. If they check out, I will select one of these. If not, I'll have a browse for some others.
  5. For those of you who don't know Thomas Carr published a paper describing Tyrannosaurus rex growth in high resolution. The paper is below. A high-resolution growth series of Tyrannosaurus rex obtained from multiple lines of evidence And what does this mean for Nanotyrannus?
  6. Juvenile nanotyrannus and T Rex

    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...
  7. Unidentified theropod

    This next tooth im posting is another one from the Hell Creek Formation. It was found in the Tooth Draw Quarry in Butte County South Dakota. Its CH is 14.5 mm CL is 5.5 mm Its got a round base I wish i could give you a serration count but there arent any so this may be a tough one. Paronychodon maybe? Give it your best guess! @Troodon
  8. unidentified theropod

    Whats up all! I havnt posted in a while mainly due to just having everything all over the place since we've moved back into our house after a long time away due to renovation. I still have a ton of fossils in my collection and alot of unidentified teeth that im going to try and post on here more often.....ill be posting 2 tonight with the first being this tooth here : Its from the Hell Creek Formation, Tooth Draw Quarry , NE Butte County, South Dakota. Its CH is 13 mm The CBL is 8.5 mm Distal serration count is 3 / mm Mesial serration count is 4 / mm Base has an oval shape to it. Ill post a bunch of pics since some are better than others...anyway let me know what you all think ! @Troodon
  9. Theropod tooth (Labelled as Nano)

    Ok, I have given a go at doing some ID on this myself, using the very helpful "identifying theropod teeth from the Hell Creek/Lance Formation." thread. But hit a brick wall. So, if anyone could A) Let me know what this tooth is and B -- If I am on the right track with my amateurish ID attempts, that would be amazing. So, I got to eliminating it as being a Nano (Because Nano teeth are apparently rectangular and this is quite ovalish. And eliminating it as being a small version of a T-rex tooth because it isn't fat and the tip doesn't look right. And eliminated Archaeoraptor as it being a bit big. Eliminated Dakoraptor because the recurve isn't enough. This is my first time having a proper go at IDing a tooth for sale beyond googling similar--so odds are I've missed something obvious or got it completely wrong. So, it is labelled as theropod Nanotyrannus, Lance Formation, 0.5 inches in length. Any help, as always, much appreciated.
  10. Acheroraptor vs Small Nano

    Hi All, Below are 4 teeth w the small (A) tooth being a Acheroraptor w the characteristic changes in size between anterior and posterior carinae serrations and ridges in the crown. I then obtained 3 more teeth (B-D) that are larger (around 13 mms). These teeth do seem to have the serrations size difference in the carinae but only tooth (D) has the ridges and is more flattened while teeth (B) and (C) have no ridges and more thickened. Does the serrations size changes between carinae trump no ridges? And does the thickened size of the two teeth suggests that they are small nano teeth or just different position tooth. Based on the link below by Frank (@Troodon), I would believe they are all acherorpator. Would like to hear you all's thoughts. Thank you.
  11. Fossil ID Rex or Nano

    Hello everyone, On this edition of Rex or nano, we have this nice little mailbox score I got earlier this year. The seller and I are reasonably certain that it is a young adult rex. But I wanted to bring it to you folks to get your assessment. It matches the locality of Rex ( hell creek, from a microsite in Carter county) and based on my research from the forum and elsewhere it checks out as tyrannosaurid. (Ie: robustness and seemingly no pinch) Bonus question: I'm also curious on the placement of the tooth in the animals jaw. I have reason to believe it may be a right maxillary tooth.
  12. Wanted to share my latest acquisition. Decades ago a friend of mine found this triceratops dorsal vertebra in Montana. There was evidence of post-mortem predation by a nanotyrannus. A tooth broke off and embedded in the centrum. Enjoy!
  13. Partial T.rex tooth or Nanotyrannus?

    I bought this tooth last week, and it arrived today. I’m really excited about it, because it’s my biggest tyrannosaur tooth so far, and I believe it’s T.rex. It was found in the Hell Creek formation, but no other locality is given. I think it’s T-rex because of the base lacking any pinching, and the overall robustness, but I always like to hear any opinions others have. Thanks!
  14. Hi all, I posted this tooth for ID a while back. Conclusion was that it could be a Dakotaraptor, maybe, maybe. Since then I am going back and forth on the ID, basically on a daily basis So I decided to take more & new images, measure it thoroughly, put it up again, and kindly ask for your help. It was found in the Hell Creek Fm, Powder River Co., Montana. Measurements are: CH: 2.08cm CBL: 0.8cm CBW: 0.42cm Serration count per 5mm is mesial 24 and distal 18. What makes it hard for me to judge: the shape of denticles is between round and chisel (?), the tiny mesial denticles, and the position of the carinae. Lowest part of the mesial carina is sheared off, but I would not expect a twist - looking closely it would end either half way or 1/3 from base. Any help is highly appreciated!
  15. Hi I decided to make this since the new Tyrannosaur from Alberta’s Foremost Formation, Thanatotheristes deerootorum has just been named and described. Enjoy!! Tyrannosaur bearing Formations in Canada: Formations in Alberta but most of the Formations on my list are I Alberta anyway. Horseshoe Canyon Formation 74-68 million years ago, Alberta: Albertosaurus sarcophagus, possibly Daspletosaurus sp. but no compelling evidence so far. Oldman Formation 78.2-77 million years ago, Alberta: Daspletosaurus torosus, Gorgosaurus sp. Foremost Formation 80.5-78.2 million years ago, Alberta: Thanatotheristes deerootorum, possibly Gorgosaurus sp. Milk River Formation 84.5-83.4 million years ago, Alberta: Tyrannosaur. indet could be a species of Thanatotheristes, possibly Gorgosaurus sp. Scollard Formation 68-66 million years ago, Alberta: T. rex, possibly Nanotyrannus Formations in British Columbia: Wapiti Formation 76.8-70 million years ago, Alberta, British Columbia: Unknown Albertosaurinae either Gorgosaurus or Albertosaurus, possibly Daspletosaurus sp. Tumbler Ridge 135-74 million years ago, British Columbia: Tyrannosaur. indet Formations in Saskatchewan and Manitoba: Dinosaur Park Formation 77-75.5 million years ago, Alberta, Saskatchewan: Daspletosaurus sp., Gorgosaurus libratus Frenchmen Formation, 68-66 million years ago, Saskatchewan: T. rex, possibly Nanotyrannus Bearpaw Formation 75-72 million years ago, Alberta, Saskatchewan, Manitoba: Daspletosaurus sp. one specimen from Daspletosaurus sp. that drowned. For now these are all the Tyrannosaurs known from Canada. No Eastern Tyrannosaurs in Canada yet either but maybe someday. I will also update this and add as more information comes available.
  16. Unidentified Theropod tooth

    Hey everyone i hope you all had a great holiday season....this next tooth in my collection was labled saurornitholestes from the hell creek formation from powder county MT. We know that the only two described raptors from there are dakotaraptor and acheroraptor so im curious to see what you all think of this one. Nanotyrannus perhaps? Unfortunately the anterior serrations have worn off which im sure will make id'ing this tooth difficult but anyway here it is. ....the CH is 9 mm the posterior serrations are 12 per 3 mm. @Troodon
  17. Nanotyrannus in Canada

    Hi the debate about Nanotyrannus got me thinking is Nanotyrannus found in Alberta Canada in the Scollard or Frenchmen Formations. If not then it could be valid since T-Rex is found there and if it’s a juvenile Rex then there should be a least some evidence for It there, since T-rex’s are found there. And if so this could provide Nanotyrannus’s range.
  18. Happy New Year Everyone Will start the New Year with something Tom Holtz posted and said "Quick and dirty plot of new Mesozoic dinosauromorph taxa named since 2003. No evaluation of legitimacy of taxa taken into account, but "grey literature" not included. Includes new species & new genera, but not placement of old species into previously named genera" Looks like 2019 was one of the best years for naming dinosaurs My first image is that of a claw you would not see on any Trex of any age its a Nannotyannus hand claw its 4" long from South Dakota I find this very interesting the NHM dino lab posted these images of "holotype" Sauropods from Argentina that are stored in hallways in their museum. WOW.. The holotype of Patagosaurus, Saltasaurus and a nice little Mussaurus skull, capturing about 130 million years of sauropodomorph evolution between them in the collections at PVL Now this is what we need from the Kem Kem...an Abelisaurid skull with teeth The abelisaurid Majungasaurus crenatissimus from the Late Cretaceous of Madagascar! High-quality preservation courtesy of S. Gutherz Partial, juvenile hadrosaur dentary from the Liscomb Quarry of the North Slope of Alaska. Perot Museum More from the Perot Museum, Not the prettiest but this tyrannosaur tooth was found up against a Pachyrhinosaurus skull in the type locality of P. perotorum and the Arctic tyrannosaur Nanuqsaurus hoglundi. A very early ornithischian dinosaur Heterodontosaurus from the earliest Jurassic of South Africa & Lesotho , NHM Dino Lab For those of you that like Stegosaur's here is an orange creation. Understand its pretty rare Brazilian researchers have found a nearly complete fossilized skeleton of the Macrocollum itaquii, the oldest long-necked dinosaur in the world, Triassic in age A beautiful specimen of Tianyuraptor housed at the Paleontological Museum of Liaoning, courtesy of Peter Makovicky Michael Ryan posted this maxilla of Daspletosaurus, not sure of locality
  19. Dakotaraptor? Or nanotyrannus?

    This next tooth i just recently purchased was sold to me as a probable dakotaraptor tooth. Its from the hell creek formation in Powder River Co. MT. Its CH is 18 1/2 mm....posterior serrations are 20 per 5 mm. Anterior serrations are 25 per 5 mm. @Troodon , @Andy, @fossilsonwheels
  20. Tyrannosaurus rex or nanotyrannus

    Hey everyone....im gonna start posting everything i have over the next few weeks to get everyones opinions.....if i need to post more info about a specimen just let me know.....first up is a tooth tip i got ...it was labled t- rex or nanotyrannus......from hell creek.
  21. Is nanotyrannus valid?

    Hello everyone, I know this is a big scientific debate and I have researched about it but I haven't come to a conclusion. What do you think? Thank you
  22. T rex or nanotyrannus teeth

    Hello everyone, after having seen many pictures of "nanotyrannus" and t rex teeth i have some questions. The first one being, how can paleontologists distinguish nano teeth from rex teeth and also sell them for a different price when the current theory is that they are the same dinosaur, also in many cases I have seen nano teeth with the same size as t rex teeth differentiated, so if they are the same dinosaur how can this be possible? Thank you for your time.
  23. Hello! Over the weekend I made some new labels for my fossil collection and I was wondering what everyone thought of them. I have QR codes which link to the corresponding "prehistoric-wildlife.com" species page for more info, and I added in some basic I.D. info to the cards to not crowd them. I also attached numbers to the labels and the fossils, so that I don't need to keep the labels directly next to the fossils. Would love to know what you think, and if anyone wants more information/the template I created. Thanks! P.S. Two of my I.D.s I'm still not 100% on (deltadromeus and Pectinodon) and I don't want anyone to assume I've completely I.D.ed them. Thanks!
  24. Help w/ tyrannosaur tooth

    The base is giving me some trouble with this. Wanted to know if I can get some help on ID, rex or nanotyrannus? Lance Creek Formation, Wyoming.
  25. I've just received this weird little tooth from the Hell Creek Formation. It was sold to me as a Dromaeosaur premax tooth but I have my doubts as it's quite robust. That said, the other candidate would be a Tyrannosaur and I've never seen a premax tooth with a twist like this. What's more, the carinae are strange - one has nice crisp serrations (I thought they looked a lot like Tyrannosaur serrations) while the other is smooth (it doesn't look like it ever had any serrations). Anyone have any idea what it might be?
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