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Found 15 results

  1. Albertosaurus tooth for sale

    Hello everyone. I saw this nice Albertosaurus tooth fragment online being sold for relatively cheap (under 80$). I thought it had nice size,serrations and tip. It is from the Judith formation in Montana. Do you think it is worth considering? Or do you think I should keep my money. If I could get it a bit repaired and nicely reglue the fragments,It could be quite neat I think. It would be my first Tyrannosaurid in my collection (and my only for a long time). What do you think? Here are the 3 pictures I have. Thanks alot,Regards
  2. Tyrannosaurid Tooth?

    Hi folks! Thought I might try leaning on the expertise of the forum gurus - I've owned this tooth for a few years and would like to hear any opinions of what the specimen should be classed as. It was sold as Daspletosaurus Torosus, but I'm aware of how hard it can be to label Tyrannosaur teeth (or just leave them as 'indet'). The tooth originated from Alberta, Canada. As it isn't the clearest to see, the denticles (which are very fine and equal in size on both sides) on the anterior edge curve off to the right (viewing the tooth face on), whilst the posterior serrated line is straight. PS: Apologies for the quality of photos too...my phone doesn't enjoy photographing anything magnified.
  3. Wear facets, spalling and split carinae are typical features you see on Tyrannosaurid teeth that add character and mystery to these teeth. Here are two papers that examine these features. Wear Facets Lambe (1917) noted wear surfaces on the side faces of tyrannosaurid lateral teeth from the Red Deer River deposits of western Canada. He wrote “as the upper teeth closed outside those of the mandible any wear, not on the point, would result from the contact of the inner surface of the upper teeth with the outer surface of the lower ones.” Recent work, has, however, challenged this assertion, suggesting that the shapes, locations, and incidences of tyrannosaurid wear surfaces are not indicative of tooth−tooth contact (Farlow and Brinkman 1994; Molnar 1998; Jacobsen 1996, 2003). Here the paper reevaluates this evidence by examining wearstriations in tyrannosaurid lateral teeth in addition to the shapes and locations of their wear surfaces. Wear facets and enamel spalling in tyrannosaurid dinosaurs Blaine W. Schubert and Peter S. Ungar Acta Palaeontologica Polonica 50 (1), 2005: 93-99 app50-093.pdf Split Carina 11% of the teeth studied in the paper exhibited this trait. Trauma, aberrant tooth replacement, or genetic factors may have led to the development of split carinae. The paper concluded that although not conclusive genetic factors get the most support but additional study is needed. Other factors like nutrition may play a part but the paper points out is not testable. Pay walled Split Carinae on Tyrannosaurid Teeth and Implications of Their Development Gregory M. Erickson Pages 268-274 | Received 14 Jun 1993, Accepted 17 Jan 1994, Published online: 24 Aug 2 https://doi.org/10.1080/02724634.1995.10011229 From my collection
  4. 3.75" tyrannosaurid tooth. Indet.?

    Fossil tyrannosaurid tooth found last weekend. 2nd largest one I have found and largest in the area by at least an inch. Formation is belly river group. I believe i is out of dinosaur park formation layers and possibly mix of oldman and foremost formations. I'm thinking gorgosaurus or daspletosaurus???
  5. Tyrannosaurid Bone from Delaware

    A new unrecognized metartarsal from a tyrannosaurid in Delaware is discussed in this paper. It increases the diversity of tyrannosaurids in Appalachia which previously included, Appalachiosaurus montgomeriensis and Dryptosaurus aquilunguis. Fitting for our first state. Brownstein CD. (2017) A tyrannosauroid metatarsus from the Merchantville formation of Delaware increases the diversity of non-tyrannosaurid tyrannosauroids on Appalachia. PeerJ 5:e4123 https://doi.org/10.7717/peerj.4123
  6. Texas Teeth

    Here's some of my best Texas teeth. All personal finds except for the partial Tyrannosaurid tooth. The little red tooth on the bottom is also Mosasaur.
  7. Chiropractor discovers BC's first dino skull. Looks like a Tyrannosaurid. Pretty good find while on holiday http://www.cbc.ca/amp/1.4158748
  8. Interesting paper that supports reptilian looking tyrannosaurids From Abstract Recent evidence for feathers in theropods has led to speculations that the largest tyrannosaurids, including Tyrannosaurus rex, were extensively feathered. We describe fossil integument from Tyrannosaurus and other tyrannosaurids (Albertosaurus, Daspletosaurus, Gorgosaurus and Tarbosaurus), confirming that these large-bodied forms possessed scaly, reptilian-like skin. Body size evolution in tyrannosauroids reveals two independent occurrences of gigantism; specifically, the large sizes in Yutyrannus and tyrannosaurids were independently derived. These new findings demonstrate that extensive feather coverings observed in some early tyrannosauroids were lost by the Albian, basal to Tyrannosauridae. This loss is unrelated to palaeoclimate but possibly tied to the evolution of gigantism, although other mechanisms exist. http://rsbl.royalsocietypublishing.org/content/13/6/20170092
  9. Tyrannosaurus sp?

    Tyrannosaurus sp? from West Texas. No restoration or repair. 1 1/2".
  10. I searched the web and found only a reference to another thread that seem to say this was Tyrannosaurid indet but it seems to be some time back before Timurlenga was described as a species. My question is, is it possible this is timurlenga? Or does the Bissetky Tyraanosaurid sound a better fit?
  11. I bought this nice theropod tooth online and the seller told me that it was a Daspletosaurus from the Judith River Formation, Montana. While looking online for more info, I found a few people saying that some dealers lie about the genus of tyrannosaurid teeth (especially with Daspletosaurus) as they are hard to identify. Just wondering if anyone here can I.D. this tooth? Suggestions are much appreciated!
  12. Tyrannosaurid tooth

    Tooth of a Tyrannosaurid. This tooth belongs to either Albertosaurus, Gorgosaurus or Daspletosaurus. Note the wear facets on the top and medial side of the tooth.
  13. Its is found at the ili river basin, dzhungar alatau kazakhstan,
  14. Collectors, sellers on eBay and some dealers periodically ask me to help them in the identification of tyrannosaur type teeth. So I thought I would put something together to share my understanding of these teeth. I am focusing on teeth from the formations that are collected most frequently and available for sale. These include Hell Creek, Lance, Judith River, Two Medicine and the Canadian Formations of the western Provinces. Starting with the Campanian (72-83 mya) deposits there are three types of Tyrannosaurids present: Gorgosaurus, Albertosaurus, and Daspletosaurus being the largest. Teeth of these dinosaurs can exceed 4" (10cm) but most being sold or found are less than 3". Paleontologists views on identification of these teeth has changed over the years and is still evolving. A paper that came out in 2005 which was authored by Phil Currie et al. studied teeth from this period looking at tooth and serration morphology. Their conclusion was that "it is difficult to quantifiably distinguish these teeth reliably by taxon" . Bottom line, in my opinion, all these type of teeth should currently be identified as Tyrannosaurid indet. until further notice Having said that if you happen to be the proud owner of tooth around 4" its fair to say its probably from a Daspletosaurus. I'm not aware of any Gorgo or Alberto skull with teeth that large but have not seen them all. In the Maastrichtian (66-72 mya) deposits there are two Tyrannosaurid present: T-rex and the controversial Nanotyrannus Serrations need to be approximately the same size on both anterior and posterior sides Everyone is focused on the belief that T-rex serrations need to be under 2/mm for it to be a Rex. The facts do not support that belief. First the Campanian Tyranno study showed that tooth serrations do not aid in distinguishing between taxon and that study included juvenile T-rex teeth. Second, since I did not have a similar Maastrichtian research paper to fall back on I did an unscientific study with teeth from my collection. I sampled a dozen maxillary and dentary teeth from both Nano's and Rex's. Nano teeth ranged in size from 7/16" to 2" and Rex teeth were 1/4" to 4 1/2". I used both juvenile and adult teeth. (all counts were done over a 5mm spread on the distal side mid tooth) My findings were interesting and surprised me. In both species the number of serrations decreased in quantity as the tooth became larger. The serration count results: Nano's : Range from 4.5/mm to 2.7/mm Size: 7/16 to 1" : 4.5 to 3.4/mm 1" to 2" : 3.1 to 2.7/mm Rex's: Range 4.3/mm to 1.6/mm. Size: 1/4 to 1" : 4.3 to 3/mm 1" to 2" : 3.4 to 2.5/mm 2.5 to 3.5" : 2 to 1.8/mm 4.5" : 1.6/mm So how do you tell the difference between Nano and Rex. Well if its 2 1/2" or larger and has bulk its clearly Rex regardless of what the serrations say. It cannot be anything else. The problem arises with smaller teeth, you cannot go by serration count since they are similar. Clearly some small maxillary teeth will mimic each other and those have to be identified as Tyrannosaurid indet. However there are clear morphological difference in smaller teeth. The best way to distinguish these teeth is first in the cross section at the base and second compression Rex dentary teeth are oval at the base and you can see that in most maxillary teeth. Nano teeth are unique as tyrannosaurids go they are compressed and their cross section at the base is rectangular. A good technical way to see Rex teeth is that they are fat. Here are examples of the cross sections of couple small Rex teeth under 1 1/2 inch and Adult Nano's Rex (teeth are oval) Example of the shape of these teeth at the base. Although these are tyrannosaurids from the Judith it's applicable to T-rex Morphometry of the teeth of western North American tyrannosaurids and its applicability to quantitative classification Article (PDF Available) in Acta Palaeontologica Polonica 50(4):757–776 · April 2005 with 762 Reads Nano (teeth are rectangular) Compression is other attribute. Rex - (teeth are fat) Nano (teeth are flatted) . So if you are comfortable distinguishing between the two you can own a Rex tooth at a price that is much more affordable than the big one. It will not be the statement piece but its still Rex. I have not said anything about the Tyrannosaur Aublysodon and still see premaxillary teeth, those without serrations sold under that name. This dinosaur is considered nomen dubium and teeth ascribed to it belong to other Tyrannosaurs. I also have not said anything about premaxillary teeth. These should all be identified as Tyrannosaurid indet. with one exception T- rex. If you have one where the length is greater than 1 1/2" it Rex and enjoy. These of course are my opinions and I understand that there is a different views by some on Nanotyrannus and that's okay. We will convert you someday
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