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  1. The Eumaniraptora is a clade of non-avian theropod dinosaurs that first emerged during the late Jurassic period and diversified extensively during the subsequent Cretaceous period (143-66 Million years ago). This group is most famously known as the Raptor dinosaurs (the sister clade of the theropod dinosaurs that gave direct rise to the birds), consisting of mostly small to mid sized theropod dinosaurs. There are a few species though that exceed the typical small-medium size range for the raptor dinosaurs. Only a few giant raptor dinosaurs are currently known. But recent discoveries over the past few decades have demonstrated large raptor dinosaurs were less of an exception in Cretaceous ecosystems than previously thought. Here is a list of all the currently known giant Eumaniraptora from the fossil record which hopefully can expand our understanding the vital roles these animals played in the ecosystems they once inhabited. Let me know if I forgot any examples. South America Austroraptor cabazai (Dromaeosauridae - Argentina, South America) (Late Cretaceous (78-66 Million Years ago)) (grew up to 6 meters (20 feet) in length) https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2679073/ Antarctica Imperobator antarcticus (Eumaniraptora - part of what is now James Ross Island, Antarctica) (Late Cretaceous (71 Million Years ago)) (grew up to 4 meters (13 feet) in length, note: did not have the iconic pair of sickle shaped claw on its feet like most other Eumaniraptora) https://www.sciencedirect.com/science/article/abs/pii/S0195667118300120?via%3Dihub Asia Achillobator giganticus (Dromaeosauridae - part of what is now Mongolia, Asia) (Late Cretaceous (96-89 Million Years ago)) (grew up to 5 meters (16 feet) in length) Perle, A.; Norell, M. A.; Clark, J. M. (1999). "A new maniraptoran Theropod−Achillobator giganticus (Dromaeosauridae)−from the Upper Cretaceous of Burkhant, Mongolia". Contributions from the Geology and Mineralogy Chair, National Museum of Mongolia (101): 1−105. Unnamed Bissekty Formation Giant Dromaeosauridae (Dromaeosauridae (could possible be a species of Itemirus) - part of what is now Uzbekistan, Asia) (Late Cretaceous (92-90 Million Years ago)) (based on Specimens CCMGE 600/12457, ZIN PH 11/16, grew up to 5.5 meters (18 feet) in length) https://www.researchgate.net/publication/263891965_Dromaeosauridae_Dinosauria_Theropoda_from_the_Bissekty_Formation_Upper_Cretaceous_Turonian_of_Uzbekistan_and_the_phylogenetic_position_of_Itemirus_medullaris_Kurzanov_1976 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 Europe Unnamed Wessex Formation Giant Dromaeosauridae (Dromaeosauridae (specimens for this species could belong to Vectiraptor) - Isle of Wight, Great Britain, Europe) (Early Cretaceous (125 Million Years ago)) (based on Specimens IWCMS.2002.1, IWCMS.2002.3, IWCMS.2002.4., and BMNH R 16510, grew up to 5.5 meters (18 feet) in length) https://www.researchgate.net/publication/222830089_The_first_record_of_velociraptorine_dinosaurs_Saurischia_Theropoda_from_the_Wealden_Early_Cretaceous_Barremian_of_southern_England https://www.sciencedirect.com/science/article/abs/pii/S0195667121003712 Unnamed Giant Dromaeosauridae (Dromaeosauridae - Gorodishchenskii District Russia, Europe) (Late Cretaceous (72.1-66.0 Million Years ago)) (based on Specimen VGI. no. 231/2, grew up to 5.8 meters (19 feet) in length) https://www.researchgate.net/publication/235806763_Carnivorous_dinosaurs_Saurischia_Theropoda_from_the_Maastrichtian_of_the_Volga-Don_Interfluve_Russia North America Utahraptor ostrommaysi (Dromaeosauridae - Western North America) (Early Cretaceous (135-130 Million Years ago)) (grew up to 5.5 meters (18 feet) in length) https://www.researchgate.net/publication/285714464_A_large_dromaeosaur_Theropoda_from_the_Lower_Cretaceous_of_eastern_Utah Dakotaraptor steini (Dromaeosauridae - Western North America) (Late Cretaceous (66 Million years ago)) (grew up to 5.5 meters (18 feet) in length) https://www.researchgate.net/publication/283655219_The_first_giant_raptor_Theropoda_Dromaeosauridae_from_the_Hell_Creek_Formation Unnamed Marshalltown Formation Giant Dromaeosauridae (Dromaeosauridae - Eastern North America) (Late Cretaceous (72.1 Million Years ago)) (based on Specimen NJSM 14158, grew up to 5.5 meters (18 feet) in length) https://www.researchgate.net/publication/327117985_The_distinctive_theropod_assemblage_of_the_Ellisdale_site_of_New_Jersey_and_its_implications_for_North_American_dinosaur_ecology_and_evolution_during_the_Cretaceous https://terpconnect.umd.edu/~gdouglas/raptor/index.html Unnamed Tar Heel Formation Giant Dromaeosauridae ((Dromaeosauridae - Eastern North America) (Late Cretaceous (78.5-77.1 Million Years ago)) (Based on Specimen YPM.VPPU.021397, grew up to 3.4 meters (11 feet 2 inches) in length) https://peerj.com/preprints/26829/ Alaska Troodontid (Troodontidae (could be a species of Troodon or a new genus in Troodontidae) - Prince Creek Formation Alaska, Western North America) (Late Cretaceous (70.6-69.1 Million Years ago) (grew up to almost 4 meters (13 feet) in length) https://www.researchgate.net/publication/236632883_On_the_Occurrence_of_Exceptionally_Large_Teeth_of_Troodon_Dinosauria_Saurischia_from_the_Late_Cretaceous_of_Northern_Alaska Latenivenatrix mcmasterae (Troodontidae - Dinosaur Park Formation, Alberta Canada, Western North America) (Late Cretaceous (75.5 Million years ago)) (grew up to 3.5 meters (11.5 feet) in length) https://tspace.library.utoronto.ca/bitstream/1807/78296/1/cjes-2017-0031.pdf Unnamed Mount Laurel Formation Giant Dromaeosauridae (Dromaeosauridae - Eastern North America) (Late Cretaceous (72.1 Million Years ago)) (based on Specimen NJSM GP 22949, grew up to 3.4 meters (11 feet 2 inches) in length) https://royalsocietypublishing.org/doi/10.1098/rsos.191206 What do you guys think?
  2. Toast123

    Hell Creek Theropod tooth

    From the hell creek formation in carter county, originally labeled as Dromaeosaurus but as far as I’m aware the only two species of raptor that exists in Hell Creek Fm are Acheroraptor and Dakotaraptor. Please let me know if more pictures are needed to ID CH: 12 mm CBL: 6 mm CBW: 3 mm 7 denticle per 1 mm DISTAL mesial denticles are not visible
  3. 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!
  4. Frightmares

    Dakotaraptor tooth?

    Just want to get some opinions before I purchase a tooth. Do you guys think this is definitely a Dakotaraptor tooth? Or does it look more Nano? Size is .71” and it’s from Hell Creek Formation, Garfield County, Montana. 24506BD7-17AC-42BF-B3C6-7C613A84332B.webp 31C05BFB-8621-4C95-9A7A-4A92A0C553D7.webp E6280DD3-5623-4D78-966F-F7A20751CEFB.webp 7CFB9AAF-269D-48B6-A26E-5265AE476524.webp E04ED762-40B5-42D1-BADA-52A77A44425B.webp
  5. Fossil Collect

    Nanotyrannus or dakotaraptor tooth?

    Hello is this a Nanotyrannus or dakotaraptor tooth? The seller labeled it as a dakotaraptor or Nanotyrannus. I don’t know what the locality is but the tooth is 1.09 inches long and from the hell creek formation of Montana, thanks.
  6. Nanotyrannus35

    Possible Dakotaraptor Tooth

    I have this tooth that I got from Tooth Draw Quarry. It's probably nano, but just wanted to make sure. CH is 15mm CBL is 8 mm. Serration density is about 4/mm distal and maybe 5 mesial. Sorry for the blurriness. Also, the base is only pinched on one side. Thanks for any help.
  7. Dino Dad 81


    Hi and thanks for taking the time to check this out. I've got a Dakotaraptor prospect from the lance formation, Weston Co, WY. I think the biggest challenge in IDing is the condition of the tooth--particularly the serrations. The specs look good to me and I think there's just enough left of the tooth to have some confidence in the specs being as follows: CH: 19.2mm CW: 10.2mm Mesial serration density: about 5 per MM Distal serration density: about 4 per MM Base cross-section: Almond, no pinch whatsoever Mesial carina: straight and serrations appear to end about 2/3 of the way down Misc: the overall shape and sort of inflatedness of the tooth from tip to base seems to compare well to DR. Apologies for the difficult-to-see serrations. As you can see, I did my damnedest to make the most out of stumps. There's nothing to see in terms of serration shape, but the roundness and spacing of the stumps seems to give the impression of raptor vs blockier stumps with less space in between. Thanks!
  8. AranHao

    Is it a Nanotyrannus tooth?

    I have a nanotyrannus tooth( 2 1/8" inches )from the Hell Creek Formation of Montana. But now I have doubts about its authenticity ,Because I saw a fossilID topic that ultimately thought it was Dakotaraptor,I think mine is a bit similar,So is it a Dakotaraptor tooth or a Nanotyrannus tooth? Thanks!
  9. Dino Dad 81


    Hi, I think I just got my best candidate for a Dakotaraptor tooth. I'd love to get your thoughts. It's: From the hell creek formation, South Dakota It's about 3/4" at its longest CH: 0.63" CW: 0.34" Mesial serration density: about 5-1/4 per MM Distal serration density: about 4-1/2 per MM Serration shape: looks "raptor" to me--or at least unusually long, thin, and rounded for a tyrannosaurid Base cross-section: Almond, no pinch whatsoever Mesial carina: straight as an arrow, serrations ending about 2/3 of the way down
  10. 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:
  11. Trying to differentiate a small to midsize Nanotyrannus and Dakotaraptor is pretty difficult. It appears that Dakotaraptor teeth are not common and sellers are quick to assign Nanotyrannus teeth to them. You need to look at all the characteristics before making a determination on a tooth and it may turn out to be indeterminate. REMINDER we have a limited view of these teeth. We have not see a complete dentition and most likely there some variations in dental positions. What is listed below is our current knowledge based on isolated teeth and the few found with the holotype. Like to thank Walter Stein for his input and allowing me to photograph a tooth in his collection. It's a Dromaeosaurid so it will have similarities to Acheroraptor but there are differences. 1) Smooth Crown These teeth do not have the vertical ridges found in Acheroraptor and are larger and beefier 2) Serration Density The serrations on the mesial (outer) edge are greater than the distal ( inside ) carina (measured midline over 5 mm) Mesial: 5-6 serration/mm Distal: 4-5 serrations/mm These are from Adult Teeth -- juvenile teeth may be greater but there is always a difference Caution: Small Nano teeth can be found with mesial densities greater than distal but are not has fine around 2 to 3 /mm 3) Carina Shape/Location Distal: Extends to the base Mesial: Often does not reach the base and is straight but reach is depended on position. Can end 1/3 from the base. We have yet to understand the morphology of the entire dentition but belive all carinae are straight Nanotyrannus: Mesial carina may have a slight sigmoidal twist not extend to the base depending on location in jaw 4) Shape of Crown/Base Teeth are recurved and compressed. Base is elongate, narrow oval or almond shape in cross-section. Usually has a greater height to length ratio than Acherorapter or Nanotyrannus. Should be 1.6 to 1.9 (Crown Height/Length Base) Nanotyrannus typically has a rectangular base in cross-section Dakotaraptor Oval (From Walter Stein Collection) Dakotaraptor Oval/Almond Shaped (from my collection) Nanotyrannus 5) Size Crowns 7/8" (2-2.3 cm) in the holotype. 6) Denticle Shape Dakotaraptor: Rounded tip Nanotyrannus: Chisel Shape tip Dakotaraptor Nanotyrannus Caution 1 Some of the characteristics overlap between Dakotaraptor and Nanotyrannus so you need to take a look at all of them before you make a call 2 The sample size of Dakotaraptor teeth is very small so we really do not have a good sense of what all tooth positions look like especially with juvenile one. Mesial carina may not extends to the base (red line) but should be straight no twist Examples Foot claws Only foot claws have been found see photo. The large claw is Digit II killing claw and the other claw is typical of the other three claws in the foot. NO hand claws have been found so we do not know what they look like.
  12. Hi all, I could not resist and took another shot on my quest to obtain a Dakotaraptor tooth. Here the tooth in question this time: It was found in the Hell Creek Formation, Garfield County. Measurements are: CH 1,41 cm - CBL 0,68 cm - CBW 0,3 cm - denticles per 5mm are 22 mesial and 19 distal. Note the slight tilt of the denticles towards the tip of the tooth. It's the best fit I have found so far, what deviates from the dePalma description is the shape of the base, it has a pinch, but I would not consider it rectangular. As a side note, it looks exactly like the base of Acheroraptor teeth I have in my collection. But, I am not an expert Thanks for taking a look!
  13. Hi I have had this Hell Creek tooth that was previously ID as Dromaeosaur (possibly Dakota Raptor) for a while and the other day I decided to get my magnifying camera out to take a deeper look at the specimen as I have heard that some Dromaeosaur and small Nanotyranus teeth can be quite challenging to tell apart from one another. These are the close up pics of the specimen that I am still a little unsure about: Mesial side with serration showing a little carinae twist Distal side with straight carinae that stretches down to the base of the tooth in straight line: Cross-section looks a little rectangular with what seem like a small pinch on the sides? From the initial observation under the scope it does seem like this could be a Nanotyranus tooth instead of a Dromaeosaur but I would like to hear the experts thought and input on it just to be sure. Thanks in advance!
  14. I really hope that the photos are enough to make a good call . Size : 1.25" , Locality : Harding country , Hell creek Formation thank you in Advance ! Best regard Guns
  15. Squirrelman91

    Hell Creek Claw ID - Dakotaraptor?

    Hi everyone! I have a large claw from the Hell Creek Formation of Harding County, South Dakota that I was hoping to have help identifying. It is large enough that I initially believed it stood a chance at being tyrannosaurid, but it seems a bit more compressed than tyrannosaur claws I’ve worked with in the past - particularly on the lower ridge. The ventral surface of the claw is also distinctly flat rather than rounded, which seems unusual. Could this be a Dakotaraptor claw or is that just wishful thinking? Large Anzu perhaps? It is right around 1.75 inches across the length of the claw (sorry, no metrics on this ruler). I have referred to the incredible guide posted by Troodon, and have some experience with various claws, but I still can’t quite come to a conclusion on this one. What are your thoughts? Thanks in advance!
  16. 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!
  17. 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.
  18. Joebiwan3

    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
  19. Joebiwan3

    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
  20. 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!
  21. Joebiwan3

    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
  22. Joebiwan3

    Dakotaraptor steini ?

    This next tooth was listed as a possible dakotaraptor steini...what do you guys think? Sorry for the finger placement in some of the pictures.....from the hell creek formation in powder river co. , MT. The size is 15/16 " and Serrations on the posterior of the tooth are 5 per mm and 10 per 2 mm. The anterior serrations look smaller and look to be about 6 per mm.... @Troodon
  23. PointyKnight

    Hell Creek Metatarsal Joint Fragment

    Hey everyone, I recently came across this fossil online. It was listed as a metatarsal joint fragment, which to me checks out, but the person further identified it as a Dromaeosaurid [though they didn't specify based on what characters] and tentatively assigned it to Dakotaraptor based on size. Now I was wondering: Can remains this fragmental even be reliably distinguished from the other small- to medium-sized theropods in Hell Creek? The fossil was found in Hell Creek deposits in Wyoming [no info on the exact location], measures 30.9 x 27.5mm [not specified along which sides], and weighs 252 grams. Thank you for any input on this!
  24. This is being sold as a dakotaraptor claw from the Hell Creek Formation of South Dakota. How does it look and could someone please tell me where on the dinosaur this claw belonged? It measures 7 by 4 by 15mm. Thanks in advance.
  25. Patrik.S.Olsson

    Dakotaraptor tooth

    Hi all! I stumbled upon a tooth thats for sale and labeled as dakotaraptor , what do you guys think? I know to little about raptor teeth to be able to make that call myself. Thanks! Patrik
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