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Found 15 results

  1. ThePhysicist

    Richardoestesia isosceles

    From the album: Hell Creek Formation Microsite

    An enigmatic tooth taxon prevalent throughout the Late Cretaceous. Unfortunately, that means not much is known about the animal that wielded these blade-like chompers. Historically, these have been considered theropod dinosaurs.
  2. ThePhysicist

    Richardoestesia isosceles

    From the album: Hell Creek / Lance Formations

    Richardoestesia teeth have very fine serrations. A couple of mm of the tip was reattached after I found it in the matrix I was scrupulously searching.
  3. I was looking at some of my small theropod teeth, but I was not 100% sure what the best ID for these two teeth were. Any input or help would be appreciated. These were sold as Nanotyrannus, but very small chance of dromaeosaurid and Aguja dromaeosaurid respectively, but I think they might be Richardoestesia cf. gilmorei. The cross-section of the Hell Creek tooth I think rules out Dakotaraptor, or at the very least, does not match the known morphology. Edit: Oops, I used the really funky side of the ruler I'm using. I was going to use the millimeter side, but ending up using a side that measures 20mm per. The measurements are accurate though as I used calipers for that. Hell Creek Formation; Garfield County, Montana CBL: 6mm CBW: 2.4mm Mesial Density: 8-9/mm [Towards end of carinae] Distal Density: 11/2mm (5.5/mm) CH is a bit difficult since the tooth has heavy feeding wear, but it is 8.3mm tall, but could be significantly higher. The mesial carinae does not appear to extend to the base. Aguja Formation; Brewster County, Texas CH 6.4mm CBL 3.7mm CBW 1.4mm Mesial Density: Possibly worn down, or none Distal Density: 16/2mm (8/mm)
  4. Fast. Intelligent. Deadly. The "Raptor" is perhaps one of the most famous dinosaur today thanks to Jurassic Park. To many people's surprise however, raptors are heavily feathered and nimbler than movies would have you believe. The Jurassic Park Velociraptor was merely the size of coyote in real life! In fact, their proper family name is 'Dromaeosaurid'. The largest species was Utahraptor, and it grew to the size of a grizzly bear! Dromaeosaurid fossils have been found all over the world. They first appeared during the Cretaceous, though isolated teeth have been found in the mid-Jurassic. Allow me to present my humble collection of Dromaeosaurid teeth. First up, from Cloverly Formation, one of my pride and joy from @hxmendoza A dromaeosaurid from Aguja Formation. I am seeing more Aguja fossils showing up, but dromaeosaurid teeth are still rare. Now, for the dromaeosaurids from the famous Hell Creek Formation. Some of them probably lived alongside T. rex. A big shout-out for @Troodon for getting me started on dromaeosaurids with this very first Acheroraptor!
  5. Hi everyone, I recently acquired a batch of small theropod teeth and was hoping to get a second opinion on some ids since a few seem kinda special. The first one I'm really leaning towards Dakotaraptor. 2-5 I'm not sure. They're all very similar looking but have very different base shapes including oval, almond, pinched rectangle, and pinched almond. The serration densities are also very interesting. The mesial serrations on all are much smaller than the distal serrations. The last one I think is a really tiny T-Rex. It's a dead ringer for a large Rex just very small. All six are from The Hell Creek of Carter County, Montana. Any insight is greatly appreciated as always! Tooth 1: Tooth 2: Tooth 3: Tooth 4: Tooth 5: Tooth 6:
  6. ThePhysicist

    Judithian Theropod

    From the album: Dinosaurs

    A theropod tooth I recently acquired from the JRF. Sold as a juvenile Tyrannosaurid, but I'm not fully convinced.
  7. As a follow up to my last topic, i've included some of the other dinosaur teeth that I acquired at an annual fossil show. The first tooth pictured is claimed to be Triceratops, no locality was included but he claims it was found in North Carolina. however I cannot find any information to which Triceratops material has been found in NC. The second tooth pictured is claimed to be a Leptoceratops tooth from Hell Creek, however it seems they are often misidentified as Triceratops teeth. The third tooth depicted is Labeled as Richardoestesia, also from the Hell Creek formation. I am grateful for any identification and information that can be provided! Please feel free to ask for more adequate photos.
  8. Nanotyrannus35

    Richardoestesia Tooth?

    I'd found this partial tooth in some lance fm matrix. It doesn't look like crocodile so I think that it might be Richardoestesia. Here are the pictures. It's about a half inch long.
  9. Hello, this tooth has baffled me for years. I can't tell if it is a juvenile tyrannosaurid dentary tooth or a cf. Richardoestesia gilmorei tooth Its locality info is Montana, Two Medicine Formation The tooth has a serration density of 19/5mm on the distal mid-line. Unfortunately the mesial carina is worn down so that crucial data is missing The CH is 11.5 mm, CBW is 7 mm and CBL is 4.5 mm As far as I am aware, juvenile tyrannosaurid (with the exception of T. rex) have slender teeth while as this tooth is somewhat robust. Meanwhile, Richardoestesia gilmorei is somewhat of a wastebasket ID for many teeth(likely unrelated species), so this teeth should fall into the range of size and morphology for one May I have your thoughts on this tooth?
  10. FF7_Yuffie

    Richardoestesia teeth?

    From a seller I'm gonna buy a pair of verts from. If these are Richardoestesia, I'll add them to the order. Two teeth from Hell Creek, Powder River County. 1.5 cm. The one on the left seems hollow, is this nornal for Richardoestesia teeth?
  11. I have yet to see a conclusive list of EVERY dinosaur known from the Hell Creek Formation, I am curious if anyone has one or knows all the dinosaurs, thank you!
  12. Paleostoric

    Richardoestesia or Dakotaraptor?

    Hi everyone, I just got this tooth from the Hell Creek Formation of Carter County, Montana. It was labeled as Richardoestesia, so based on the curvature, I was assuming the proper ID would be cf Richardoestesia gilmorei. However, when taking some measurements, what caught my eye was that the mesial carina appeared to end 1/3 from the base, and I started to wonder if instead this tooth could possibly be Dakotaraptor. These are the measurements I was able to get: Mesial: around 5.5-6 serrations/mm Distal: around 5 serrations/mm CH: around 16.5 mm CBL: around 7 mm CH/CBL: around 2.4 The crown appears to be smooth, the base is almond shape, and I believe the denticles have rounded tips. Please let me know what you all think. Also, some of the measurements may need double checking. Thanks!
  13. Good evening, today was THE day for me. In our city was the annual fair with fossils on offer. I was out and looking for uncommon/rare dino teeth and was lucky to find some. I know that most of the ID done by the sellers is wrong I would like to show my new aqusitions to you throughout the next days and hope for your help. No. 1 was sold as an "Richardoestesia gilmorei" from the Hell Creek Formation, Wyoming, USA (unfortunately no county provided). Length: 18mm Width (base) 6mm denticle count: Side 1: 6 per 1mm Side 2: 7 per 1 mm, (ca. 38 per 5 mm) I had to call it side 1 and side 2 because honestly I was not able to figure out which side is the mesial and distal side... Thank you very much for your help!
  14. fossilsonwheels

    Odd little Hell Creek tooth

    This is an interesting tooth. It is from the Hell Creek Formation. no county was given only Montana. It is .3 cm and is serrated. It has a very interesting shape to it which i thought was similar to bird teeth but after seeing the serrations, my thought was Richardoestesia gilmorei. I am probably way off in my thinking. At the very least, I thought it was interesting enough to post here and see what other opinions are. Any thoughts ?
  15. I have recently acquired a nice Richardoestesia tooth from Hell Creek. I suppose it's R. isosceles. I decided to read more about this species, and felt really confused. Why is it even considered a dromaeosaur?? As far as I know, dromaeosaur teeth are not only usually smaller and strongly distally recurved, but also have no or very fine serrations on the mesial side and coarse serrations on the distal side. Richardoestesia teeth I've seen lack all of these characteristics: they have identical very fine serrations, straight and relatively large crowns. Actually, such teeth remind me a of land crocodylians, such as Sebecus from the Cenozoic, however Richardoestesia teeth are somewhat more labio-lingually compressed.
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