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  1. ThePhysicist

    Acheroraptor tooth

    From the album: Hell Creek Formation Microsite

    Acheroraptor was a small theropod (dromaeosaurid) "raptor" that lived in the same paleo-ecosystem as T. rex. Its blade-like serrated teeth possess diagnostic apicobasal ridges.
  2. ThePhysicist

    Acheroraptor tooth

    From the album: Hell Creek / Lance Formations

    A small Acheroraptor tooth with diagnostic longitudinal ridges. Found in a channel deposit.
  3. Today is my last day off before I go back to work and I was supposed to spend the day making fossil starter kits. I have a cold though and I do not want the kids to think that 12 million year old shark teeth gave them a cold lol I am pretty bored so I thought I would post about our Judith River dinosaur fossils and how we are going to get discuss this formation. I am really surprised how much I am enjoying learning about these dinosaurs and this will be a formation that we spend a good bit of time on. It must have had some very productive ecosystems and there is a great diversity here to discuss. The kids will also get to see some familiar dinosaur families while learning about species that are new to them. I think during adaptation related presentations, this formation lets us get into ecological niches and discuss how two Tyrannosaurids existed as did at least two species of Dromaeosaurids and a Troodonitd plus other predators including non dinos. That is a lot of hungry mouths so niche selection and adaptations become very important. THere is also a great diversity of herbivores in this formation. I love the Ceratopsians from this formation and the diversity gives my son a lot of artistic options. We currently have one tooth but by the time we present we will have a couple more I think. This allows us to present a few species and say the teeth are not diagnostic so the teeth could have belonged to one or more really cool looking horned dinosaurs. This also gives the kids knowledge that there other Ceratopsians besides Triceratops. This will also be the point where we introduce Dromaeosaurids. Raptors are just iconic and this formation gives us the chance to really hit on adaptations. We have a Saurornitholestes tooth and will soon have a Dormaeosaurid caudal vertebra. While not assigned specifically to Dromaeosaurus, the vert will presented that way so we can talk about the differences between the two raptors. Of particular interest is the larger skull, more robust teeth, and specific wear patterns on the teeth of Dromaeosaurus. We will also have a small tooth tip from a Tyrannosaur indet. The kids will love learning about other Tyrannosaurids and I will leave it to the kids to imagine which one it belonged to. The real owner of the tooth is not important. That two existed in this formation is what is important. They must have occupied different niches plus a lot of kids may think T-Rex was the only member of that family. The last fossil I know we will have from Judith River is one of my favorites. It is an Ankylosaurus tooth and thanks to some help from TFF members, I spotted this among a few Nodosaur teeth. In our inventory, this is Ankylosaurus indet. However, in every single dinosaur presentation we do this will be Zuul and it will be a rock star. We want the kids to understand that there are many new discoveries being made and there will be a lot of new dinosaur discoveries made by THEIR generation. Everything about Zuul will be cool to kids. It is the one of the most incredible fossils ever found, armored dinosaurs are just cool, and it even has a pop culture name that a lot of kids will recognize from Ghostbusters lol Only 5 fossils but we can do A LOT of quality education with these fossils. I also have a very clear idea of the next items to find from Judith River. #1 on that list is a Dromaeosaurus tooth. A tooth gives us the perfect way of illustrating the difference between the raptors. We have two more purchases to complete before I buy again so I will save up and in the spring I start searching for that tooth. I also would love to add a hadrosaur bone from this formation and eventually I will track down a frill piece. Anyway, here a couple of the fossils... Pic 1- our Saurornitholestes tooth. Not a great picture but a really nice tooth. Pic 2- the Dormaeosaurid indet vert. Not here yet but will be right around my B-day. Pic 3- the Anky tooth. It is just a cool tooth and Zuul is a great dinosaur to teach kids about so Zuul is what this tooth is for Fossils on Wheels. Our only fossil from an armored dinosaur.
  4. Anchiornis_huxleyi

    Hell Creek "raptor" ID

    Olá, recentemente vi à venda este dente de dromeossaurídeo da formação Hell Creek, tem 0,27 polegadas. Foi encontrado no leste de Montana. Gostaria de saber se pode ser um aqueroraptor ou algum troodontíde? Hello, I recently saw this dromaeosaurid tooth from the Hell Creek formation for sale, it is 0.27 inches. It was found in eastern Montana. I would like to know if it could be an acheroraptor or some troodontid.?
  5. Bguild

    Dromaeosaurid Pubis Bone?

    Hi There - I came across this nice looking dino bone identified as "The top section of a pubis bone from a Dromaeosaurid." This bone was found in the Hell Creek Formation in South Dakota. It looks like a nice piece with minor repair, but I wanted to get some second opinions on whether this is a piece of a pubis bone, or possibly a chevron... or something else. I'm also curious if folks agree with the the ID of dromaeosaurid (unable to ID beyond the family). What do you think? Thanks!
  6. ThePhysicist

    Dromaeosaurid

    From the album: Hell Creek / Lance Formations

    A small tooth from a Dromaeosaurid "raptor" dinosaur, located in an anterior position in the mouth. Found in a channel deposit.
  7. 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!
  8. ThePhysicist

    Paravians of Hell Creek

    From the album: Hell Creek / Lance Formations

    Even in the final years of the non-avian dinosaurs, the paravians remained diverse, with many species represented in the famed Hell Creek formation.
  9. For those of you that collect material from Uzbekistan this is interesting. The attached "PAYWALLED" paper describes a very large Digit II-2 phalanx that belongs to a giant Dromaeosaurid. The article also raises questions around the recently described Ulughbegsaurus uzbekistanensis but need to read the publication if I can get my hands on it. https://www.cambridge.org/core/journals/geological-magazine/article/abs/giant-dromaeosaurid-theropod-from-the-upper-cretaceous-turonian-bissekty-formation-of-uzbekistan-and-the-status-of-ulughbegsaurus-uzbekistanensis/4543ABAB1EC19C84405EDF66A5F53124#
  10. Kikokuryu

    Tiny Judith River Theropod Teeth

    These teeth were sold as a baby tyrannosaurid and a dromaeosaurid/bird respectively. Some other specimens from this lot have been posted here if I recall. But they are from North of Havre, Montana close to the Canadian border. Apparently they are from quite an old collection from around 1950-70s. The provenance should place it solidly in Judith River Formation. Since these teeth were selling somewhat quickly, I just grabbed them and decided on figuring it out later. The first tyrannosaurid tooth does have some similarities to Dromaeosaurus with the mesial twist, but I could be wrong. The second tooth is a bit more confusing. I'm guessing it is Zapsalis-type with those striations which would make it Saurornitholestes. I don't think it's bird compared to bird teeth from other deposits. It's probably not one of those Campanian microraptorians either, and it's probably too big even at this size to be bird or micro. 1st tooth: Length=6.3mm; Distal Density=17.5/3mm; CBL=2.9mm; CBW=1.8mm 2nd tooth: Length=5.8mm; Distal Density= ±11-12/mm (?); CBL=2.6mm; CBW=1.3mm Serration density for the 2nd tooth might not be too accurate since it was extremely difficult to even get to that number. Not sure how to go about getting CH, but it's probably a little bit more than the length since the tips are worn. 1st tooth might be good as is since with that small root section, that probably makes up for what would be a longer crown. 1st Tooth 2nd tooth
  11. This small tooth was found in powder county, it measures a little over half a inch and I wanted help with identification . Seller listed as either Nanotyrannus or Tyrannosaurus rex. I also think it’s most likely tyrannosaurid, and I wanted to know whether it’s tyrannosaurid and if it is whether it’s more likely to be Nanotyrannus or Tyrannosaurus rex. Im assuming it’s just a indeterminate tyrannosaurid because of the base damage and size, but please let me know you opinions.
  12. ThePhysicist

    Tyrannosaurid vs Dromaeosaurid

    From the album: Hell Creek / Lance Formations

    As a theropod tooth aficionado, I thought it useful to compare two families present in the Hell Creek Formation. They become increasingly difficult to distinguish as they get smaller, but this graphic presents some features which may be used to differentiate them on two similarly-sized exceptional specimens. Keep in mind there is some variability due to position, ontogeny, etc., so it's beneficial to study more than one tooth for each family.
  13. Hi TFF, I am a Dromaeosauridae enthusiast and have been collecting online for a little while now. I want to thank the members here for getting me educated on so many aspects of fossil teeth identification. I want to share my small collection in the hopes this is helpful for some of you in the future. Your critical input is highly appreciated, as always! #1 First up, one of my treasures, a robust Deinonychus antirrhopus tooth from the Cloverly Fm. A big thanks to @StevenJD for letting go of this one – much appreciated! Note the asymmetry in the placement of the carinae, best noticeable from the top view. #2 Representing the Judith River Fm., a cornerstone of my collection, a 1st left premaxillary tooth of Dromaeosaurus albertensis. I just love the way the mesial carina ‘folds’ onto the lingual surface. #3 Another premaxillary tooth from the Judith River Fm., a Zapsalis abradens with prominent ridges. The mesial carina has a nice twist, the cross section looks rather symmetrical, so likely not a 1st or 2nd premax. Distal denticles are hooked towards the tooth tip, but no mesial denticles are present and the tooth is not recurved. So, for now it is labeled as cf. Zapsalis abradens after Currie and Evans 2019, but could eventually be re-labeled as Saurornitholestes langstoni.
  14. BirdsAreDinosaurs

    Kem Kem theropod tooth

    Hi all. Another Kem Kem tooth that I find hard to ID. I would say definitely not Abelisaurid. When comparing this tooth to the photo's in Troodons Kem Kem theropod topic I fine it hard to find a good match. The tooth is 3 cm long. Thanks again!
  15. BirdsAreDinosaurs

    Kem Kem Dromaeosaurid like tooth?

    Since I bought a couple of (very nice) Abelisaurid teeth from Kem Kem, which I initially thought where Dromaeosaurid, I am on the lookout for potential Dromaeosaurid teeth from Kem Kem. I think this tooth (1.9 cm) might be a candidate, but I have been wrong before. What are your thoughts? Should I ask for better pictures of the serrations or a serratiom count?
  16. BirdsAreDinosaurs

    Three small theropod teeth from Morocco

    I recently bought these three little teeth (between 1.7 and 2.0 cm long). They are from the Kem Kem Beds in Morocco. They were advertised as Dromaeosaurus teeth, but I know that is not very likely or well supported. I think the first two teeth might be Dromaeosaurid (mesial and distal serrations are different and the tip of the teeth extend past the base) and the third one might be Abelisaurid (distal side is almost straight). But I could very well be wrong, so I would like to hear your opinions. Thanks!
  17. ThePhysicist

    Acheroraptor tooth

    Identification A. temertyorum is characterized by the typical Dromaeosaurid traits (compressed, recurved, differing mc/dc serration densities), and longitudinal ridges/facets on the crown face. Notes This tooth was found this past Summer ('21), and in the same county as the holotype specimen.
  18. ThePhysicist

    Acheroraptor temertyorum

    From the album: Dinosaurs

    Acheroraptor temertyorum Hell Creek Fm., Garfield Co., MT, USA Note the diagnostic ridges.
  19. ThePhysicist

    Dromaeosaurid Tooth

    Identification: This is a typical Dromaeosaurid tooth, with the serrations being differently-sized on each carina; the denticles are much smaller on the mesial carina compared to the distal carina. There's also slight recurvature, which is common in Dromaeosaurs. There are no other features present that allow for identification beyond Family. Described Dromaeosaurs in the Hell Creek Formation include Acheroraptor temertyorum and Dakotaraptor steini. Because both of their known dentitions are incomplete, this tooth may belong to either, or another undescribed Dromaeosaur. Identification further discussed here. Notes: CH: ~ 10.5 mm CBL: ~ 6 mm CBW: 3 mm Mesial denticle density: 8 / mm Distal denticle density: 4.5 / mm There is some minimal feeding wear on the tip, but this tooth is otherwise flawless.
  20. ThePhysicist

    Hell Creek Dromaeosaurid

    Hi y'all, I picked up this gorgeous Dromaeosaurid tooth. It was listed as Acheroraptor and I bought it thinking it was one. However, upon receiving it and taking some measurements, I believe it may be a candidate for Dakotaraptor steini, as it virtually matches one in @Troodon's collection in every metric. It has a semi-oval base, with no ridges or facets commonly seen on Acheroraptor. The mesial carina is straight, and terminates almost 1/3 the CH from the base. Dromaeosauridae Hell Creek Fm., Carter Co., MT, USA CH: ~ 10.5 mm CBL: ~ 6 mm CBW: 3 mm Mesial denticle density: 8 / mm Distal denticle density: 4.5 / mm Distal serrations: Mesial serrations: Base: This is the other tooth I'm referring to:
  21. Hi everyone. Tonight I'd Iike to share my most recent find: an absolutely tiny theropod tooth I found late at night sorting through what remains of the Aguja fm. matrix I purchased last year. I knew it would pay to be thorough and I was delighted to see the glint of enamel in a triangular shape eventually appear. Additionally, it has just taken the crown (no pun intended) for smallest theropod tooth in my collection, at only 2 mm in length and just over 1 mm in width. I'd be interested in reading your opinions on it's identity, I'm thinking either dromaeosaur or troodontid but I'm not sure. A pic of the tooth after isolating it from the surrounding dirt. Now compared to my other tiny Aguja tooth And my previous smallest tooth from the Lance
  22. The first juvenile dromaeosaurid (Dinosauria: Theropoda) from Arctic Alaska is presented in this paper. Paper https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0235078 Article http://www.sci-news.com/paleontology/alaskan-saurornitholestine-dinosaur-08618.html Inreresting tooth
  23. A new domaeosaurid, Dineobellator notohesperus, consisting of a partial skeleton from the Upper Cretaceous (Maastrichtian) of New Mexico, the first diagnostic dromaeosaurid to be recovered from the latest Cretaceous of the southern United States. The holotype includes elements of the skull, axial, and appendicular skeleton. From the Ojo Alamo Formation Dineobellator notohesperus Article https://phys.org/news/2020-03-feathered-dinosaur-surviving-raptors.html Smithsonian Mag. Article https://www.smithsonianmag.com/science-nature/dineobellator-dinosaur-new-mexico-180974511/ Paper https://www.nature.com/articles/s41598-020-61480-7
  24. Hi all, I have been staring at this tooth for quite a while now with question marks in my head. It was found in the Bissekty Formation, Kyzylkum desert, Uzbekistan. It's 27mm long (1.01 inch) and properly labeled as Theropod indet. However, the seller raises the possibility of it being a Dromaeosaurid. Serrations do look different in length and width, a count on screen gives me distal 13/5mm and mesial 16/5mm. What throws me off is the rather 'stout' crown and round cross section, more Tyrannosaurid in my view. However, I have no reference images and the only publication I found (Sues and Averianov 2014) is not exactly helpful. I posted available images - I could contact the seller if additional information is required. Any input is highly appreciated.
  25. Here are some photos of some of my dromaeosaurid fossils from the Aguja Formation of Brewster County, Texas.
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