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Found 25 results

  1. 2 ID posts in 1 day?

    1. Partial mammal tooth? (Peace River FL, Mio, Plio or Pleisto). Maybe a piece of horse. 2. Another partial mammal tooth (potentially odontocete? also Peace River FL). 3. Yet another piece of Mammal tooth (Peace River).
  2. Quick ID pt. 1: Croc verts?

    These two vertebrae were found in a Lance formation channel deposit last month. The guide w/ me said they were both crocodile. I thought I would post their pictures see what you all think. 1. Cervical?
  3. A few IDs from recent trip out west

    Hi all! I returned from my trip out west a few days ago and wanted to have some fossils identified before I do my big recap of my experience and my photos from the field. Here are some specimens I found of which I'm not certain of their identity. (This will not be my last post of this type from this trip). 1. Small theropod tooth (Richardoestesia sp.?, Acheroraptor temertyorum?). (There appear to be serrations on the front of the tooth but the majority of them seem to have worn off or did not extend further than midway through the tooth). (Near Newcastle, WY, Lance Fm.). 2. Turtle/Croc toe bone? (Near Newcastle, WY, Lance Fm.). 3. Larvae? (Douglas Pass, Green River Fm.).
  4. Consolidated all my informational Topics to make it easier to reference. Will keep updating since some of the reference material is outdated. Have to thank @PFOOLEY for suggesting this consolidation and it makes it a lot easier for me to access these topics as well as our members to know what's out there. General Tips in Buying Theropod Teeth Dinosaur Anatomy 101 Stratigraphy of the Late Cretaceous in North America Triassic Identification of Dinosaur Teeth from the Triassic of New Mexico Jurassic: Morisson Formation Identifying Ceratosaurus Teeth Identification of Marshosaurus Teeth Tips in Buying a Sauropod Foot Claw Jurassic: Europe Dinosaurs of Costal Portugal Jurassic Theropods of Germany Cretaceous: North America Identification of Theropod Teeth in the Hell Creek and Lance Formations Identification of Troodontid Teeth Identification of Tyrannosaurid Teeth From North America Identification of Ankylosaurid Teeth Identification of Acheroraptor Teeth North American Tyrannosaurids what is Described Identification of Claws and Ungals from the Hell Creek and Lance Formations Identification of Pachycephalosaurid and Thescelosaurus Teeth Tooth Features in Tyrannosaurids Dakotaraptor Teeth and Claws Hell Creek Fm Identification of Bones /Claws from Alvarezsaurids from North America Hell Creek Faunal Representation Identification of Theropod Teeth from Judith River and Two Medicine Formations Cretaceous: Kem Kem of Morocco Kem Kem Theropod Teeth Kem Kem Theropod Tooth Morphology Identification of Sauropod Teeth from the Kem Kem Tips in Purchasing a Spinosaurid Hand Claw Identification of Claws from the Kem Kem Identification of Spinosaurid Jaws from the Kem Kem Cretaceous: South America Patagonia's Theropod Teeth Cretaceous: Uzbekistan: Identification of Theropod Teeth: Uzbekistan Sauropod Teeth: Uzbekistan Cretaceous: Europe Identifying Baryonyx Teeth
  5. This is now my third post on my finds from last years trip to Wyoming. If you want to check out my previous posts click on these links - Theropod claw and Microsite Fossil ID. (* = two specimens of similar size) 1. Brachychampsa montana tooth (1 cm). 2. Thescelosaurus neglectus vertebra (2.5 cm). 3. Lonchidion selachos (?) Hybodont spine (3.5 cm).
  6. 2017 Wyoming Microsite Finds

    Last summer on my trip out west, I found these teeth at a Lance Formation microsite in Wyoming. Many of the fossils were found through splitting a yellowish-orange concretion filled matrix, while others were free from it. This site was on the same ranch where I found my theropod hand claw but in separate locality. It's rather late (EST) at the time I'm posting this but wanted to show some of the teeth I found and was hoping I could get some help identifying them. 1. Pectinodon bakkeri 2. Richardoestesia sp. (?) 3. Lizard/ Worn Herbivorous Dinosaur Tooth (?)
  7. 2017 Wyoming Trip

    Before I go back out west to the badlands of Wyoming in July, I thought I should post some pictures of one of my best finds from last years trip; My theropod hand claw (Nanotyrannus/ Juvenile T. Rex?). Hope you enjoy!
  8. I’m probably posting this in the wrong topic area. I’m not sure which it goes in. This link is from my alma mater. I’ve posted the link before. https://fossil.swau.edu/ It’s to their fossil database. Many of the fossils have a 3D viewer option where you can look at the fossil 360 degrees. I saw this Trodon tooth on there this evening and thought it was pretty cool looking. I can’t recall ever seeing a Trodon tooth on here before so I thought I’d share the link. It came from the Lance Formation in Wyoming. I’ve been on the dig a couple times. I can’t get the link to go directly to the tooth so you can view it 360, but if you click on the browse tab after you go to the link then type in the catalog # HRS06576 it will take you to it. There are over 20,000 fossils on there from the Lance formation. I saw lots of teeth on there. Some from species I’d never heard of before. This is another Trodon tooth I saw on there. I think it’s very cool looking. I forgot to crop my screenshot. Oops.
  9. Not sure how many have see this Devian Art Representation of the Dinosaur fauna in the Hell Creek & Lance Formations. It's Paleop interpretation of what he believes exists. Download the image in the link to see it best. Not everything he shows has been officially described but the number and type look pretty good. It's pretty cool The image is the link
  10. Troodontids certainly are one of my favorite dinosaur families. Intelligent and what a set of chompers to eat you with, all you can ask for in a cool dinosaur. Will start this with the Pectinodon teeth in my collection and will continue to add as I take photos. This species has some of the coolest teeth. Pectinodon bakkeri is the only named Troodontid in the Hell Creek and Lance Formations. This is a tooth taxon and its teeth are significantly much smaller than its big cousin Stenonychosaurus. Lance Formation Hell Creek Formation A couple of the teeth in matrix are partially rooted which is extremely rare since the teeth are so small Hell Creek Formation - Powder River County Hell Creek Formation
  11. Only two Ankylosaurs are reported from the Hell Creek and Lance Formation the Nodosaurid Denversaurus schlessmani and Ankylosaurid Ankylosaurus magniventris. I've identified my material to reflect these dinosaurs and if additional ones are discovered will change my identification. Material from these dinosaurs are extremely difficult to find with Teeth and Scutes being the most common. Bones are extremely rare. My Tail Club - also have a container full of isolated pieces that go to the missing portion. A few representative scutes from my collection. Most come from one area and are most likely associated. Have +30 from this site. One of my dinner plate scutes I call this my Bactrian Camel double humped scute. Different locality with a bulbous base.
  12. A member asked me to check out some auction offerings for Morrocan Dromaeosaurus teeth and I did and they of course they were improperly identified. Not being familiar with the identification of these teeth I tried to help him by checking around on different dealer websites and was appalled at what I found. What I refer to as key dinosaur suppliers, on the web, were selling Dromaeosaurus teeth from the Hell Creek Formation of Montana. What makes me more upset is that I told one of them that they do not exist. All the listings were beautiful teeth however they were not Dromaeosaurus but looked like Nanotyrannus. Reminder to all those that are interested in purchasing teeth or bones from the species Dromaeosaurus it does not exist in the Hell Creek Formation or Lance Formation or Morocco. That species can only be found in the States from the campanian deposits of the Judith River Formation and Two Medicine Formation of Montana. Canada also has a number of formations where it can be found also in Campanian deposits but you rarely see them offered for sale. The Hell Creek and Lance Formations have only two Dromaeosaurids described Acheroraptor and Dakotaraptor. So if your interested in purchasing a Dromaeosaurid tooth from those faunas it needs to be from one of those dinosaurs. Since domestic Dinosaur dealers don't seem to have their act together I suggest that you post any interest in these type of teeth here on the forum before you buy to be sure its properly identified.
  13. Bird and Pterosaur material is extremely rare in the Hell Creek and Lance Formations. Over the years I've purchased and found a few bones that I believe fit this category but not certain. Some may be mammal or reptilian. I'm not a bird guy so if you see something that does not seem right please let me know. Not a lot is published so I'm always open to learning. I showed this to a well respected theropod paleontologist and the potential ID's were his thoughts Troodontid?
  14. Paper describes shell remains of eight fossils referable to Helopanoplia distincta from the Hell Creek Formation of Montana and North Dakota that, in combination, document nearly all aspects of the shell morphology of this taxon. Helopanoplia distincta is based on just two shell fragments from the Lance Formation of Wyoming. The new fossil material thoroughly supports the validity of Helopanoplia distincta. There is also a very informative map showing where the exposures are of the Hell Creek and Lance Formations. Joyce WG, Lyson TR. (2017) The shell morphology of the latest Cretaceous (Maastrichtian) trionychid turtle Helopanoplia distincta. PeerJ 5:e4169 https://doi.org/10.7717/peerj.4169
  15. I wanted to let people know of this resource. It is an online digital catalog of fossils found in the Lance Formation of Wyoming. I know they have found over 24,000 fossils, but I don't know how many have made it into the digital image catalogue. This is the URL https://fossil.swau.edu/ I'm not sure how many species there are in the catalogue. When I've been on the dig I personally found mostly: Edmontosaurus annectens Nanotyrannus lancensis But I know they also have some of the following in the collection to name a few: Thescelosaurus neglectus Tyrannosaurus rex Pachycephalosaurus wyomingensis Triceratops horridus Dromaeosaurus albertensis Trodoon formosus Leidyosuchus sternbergi Aublysodon lancensis Testudines Brachychampsa Cordata Crocadilia Unio There are more. Please pardon any spelling errors on any of the names. This data is from my Alma Mater, Southwestern Adventist University in Keene, TX. My mentor, Dr. Art Chadwick has been leading a dig every June for over 20 years at the dig site in Wyoming. In 2000 I asked Dr. Chadwick if there was anything he had need for the department. He said he wanted to buy a GPS device for the Dino dig. So I provided the department the funds they asked for to buy a fairly simple GPS device. They started using it that summer to map out the dig site and every single fossil they found from then on. No more staking out the dig with stakes and ropes. That first GPS revolutionized the way they mapped out the dig site. The GPS devices they use now are much more sophisticated and far more expensive. I'm not a paleontologist, but he has invited me to the dig every year since then. I'm not sure how many thousands of bones the have pictures of, but they say it is the largest digital catalog of its kind. Hope someone can find it a useful resource. Here is a description from the site. I couldn't copy and paste so I took a screen shot.
  16. Leptoceratops or Triceratops?

    I can't really tell if this had a single or double root. Cool shed tooth either way. The seller said it's from the Lance Formation, near Newcastle, Wyoming.
  17. Even more Lance formation fossils

    In going through some matrix from the Lance Formation, Late Maastrichtian, Wyoming, which shares much fauna with the Hell Creek formation, I have found even more interesting things since my last posting on this area. 1. The first I believe is a theropod, similar to the one in my previous posting, although slightly larger. 2. Is this (unknown 11) also a theropod tooth, or maybe crocodillian? 3. Is unknown 10 a pycnodont fish tooth? 4. Unknown looks like what has been identified as a ceratopsian "spitter" tooth in a previous posting, but this seems awfully small. 5. I have no idea as to what unknown 9 is. It looks like a tiny jaw with teeth, but seems to be closed off on both ends. I tried to clean it more, but was afraid of breaking it - it's only 2mm. 6. Unknown 6 looks like some tiny amphibian (maybe Newts) teeth that I have seen from the Permian, but not sure. 7. Unknown 7 also reminds me of ceratopsian teeth, but once again, this is really small and flatter. The hash marks are 1mm. Thanks for any help.
  18. Hi guys, On a auction website I bought a collection of small Dinosaur/ Mammal fossils from the Lance Formation in Wyoming. First photo: Have you any idea which teeth belong to what dinosaur or Mammal? And is the central left piece an crocodile scute? Second and third photo : Is it true, this could be an Ankylosaur scute? thank you very much!
  19. Hadrosaur Tooth

    Hi guys I recently got sent a package from some friends for my birthday which included some nice little goodies including tickets to see the Dinosaurs of china event in Nottingham this summer, Included was this lovely piece identified as purely teeth and bone from a Hadrosaur which was found in the Lance Formation, I was just trying to get any information regarding a species level is possible? I'm not entirely sure if this is possible but hopefully you guys familiar with the lance formation fauna may help. Many thanks, Chris.H
  20. Mystery Lance Formation Tooth

    Found a small tooth in matrix I had collected from a trip I did a few years ago to Niobrara County in Wyoming, the Lance Formation. Went through my Hell Creek/Lance Books, Papers and Guide and had no luck with anything. Tooth looks like a croc, shape and base but it has a spoon crown with a center ridge that is very different than most teeth I've seen and throws me for a loop. Hopefully someone has seen something similar. Thank you for any assistance. Lance Formation and its 7 mm long
  21. I noticed a number of online suppliers offering Troodon teeth that actually belong to the genus Pectinodon. Thought it would be a good discussion item for a focused post since they can get confusing with the various morphologies of Pectinodon teeth. I'll use publications to illustrate my points and reflect all Campanian & Maastrichtian age teeth of North America. (Edit) A new paper published late in 2017 has turned this taxon upside down. I will try to reflect those changes here but it should not change alter how they are identified against Pectinodon teeth. Specimens from Dinosaur Park Formation previously assigned to Troodon formosus have been reassigned to a new taxon Latenivenatrix mcmasterae and others to a resurrected Stenonychosaurus inequalis. Troodon formosus is now considered invalid. At the very end of this page I will show my understanding of ID's by Formation. Canadian Journal of Earth Sciences, 2017, Vol. 54, No. 9 : pp. 919-935 Troodontids (Theropoda) from the Dinosaur Park Formation, Alberta, with a description of a unique new taxon: implications for deinonychosaur diversity in North America Aaron J. van der Reest, Philip J. Currie https://doi.org/10.1139/cjes-2017-0031 Troodontids - Standard morphology These teeth are recurved, laterally compressed and oval in cross section. The Denticles are large and pointed upward on the distal (posterior) carina and minute or absent on the mesial (anterior) carina. Premaxillary teeth have strong denticles on both edges (Figure 8.3 E) Denticles per mm is typically around 4 Maximum length about 9.8mm Figure Examples : Troodontids: Large Morphology The tooth is large about 50% greater and others and can reach 14mm long, recurved and round in cross section. (See figure below 8.3 # 20-21) These have been collected from the North Slope of Alaska. Their is nothing unique to these teeth to describe a new taxon. I've have seen one of these jumbo teeth come from Alberta. Troodon Alaska.pdf Troodontids: Flat Morphology. Sankey paper "Diversity of latest cretaceous small theropods" describes a flat morphology tooth from the masstrichtian deposits, different that Zapsalis teeth that have fine serrations (See figure below 8.3 #1-8) Teeth are straight, with round cross sections. One side is flattened to concave and the other side is convex. Well developed longitudinal ridges are present. The mesial edge is smooth but can have minute denticles. The distal carina are large, larger than any other theropod. Looks like a Zapsalis tooth to me? Pectinodon bakkeri : Comparison - Troodon and Pectinodon Pectinodon - left image #5 mesial denticles usually absent #11 posterior denticles very large and often rounded much smaller average length of 2.6mm Troodonitid right image #12 posterior denticles point to the tip #13 anterior denticles exist, can be large or absent much larger average length 4 mm but can reach 9.8 Scale bar 1mm Pectinodon teeth can be put into four categories: premaxillary, maxillary, anterior & posterior dentary and all look different. In Figure 9.5 A & B are Premaxillary, C & D Maxillary, E & F Anterior Dentary and G & H Posterior Dentary Premaxillary teeth: long and slender, mesial carina strongly convex and distal is straight. Distal Denticles are large, pointed to the tip and become smaller toward the base. Maxillary teeth are compressed and bladelike. They look like small Dromaeosaur teeth. Anterior denticles are irregular in size and very small (5-6 denticles/mm). Posterior denticles are 3 per/mm. Anterior teeth are leaf shaped with no serrations on the mesial carina. Denticles on the distal edge are 1.6/mm. Denticles are irregular in size. Please note scale bar at 5mm References used: 1) Vertebrate Microfossil Assemblages by Sankey and Baszio 2) Dinosaur Systematics by Ken Carpenter and P. Currie North American Troodontids: My best call I"m sure these will be updated with new research and discoveries. Belly River Group (Alberta) : Latenivenatrix mcmasterae and Stenonychosaurus inequalis (one cannot distinguish between isolated teeth of these two species ID: should be Troodontid indet.) Kaiparowits Formation (Utah) : Talos sampsoni Judith River Formation (Montana) : Stenonychosaurus sp. Two Medicine Formation (Montana) : TMF Troodontid Hell Creek & Lance Formation (Montana, Wyoming, South & North Dakota) : Stenonychosaurus sp. All others (Alberta, Saskatchewan, Alaska, Colorado etc) : Stenonychosaurus sp. Multiple Troodontids might exist in these other fauna similar to the Belly Group. Since skeletal remains are super rare we may never know if this is true. Identification to a family level "Troodontid indet." may be more appropriate but you can decide that.
  22. A member of the forum asked if I cam put a topic together to help identify claws from the Hell Creek/Lance formation. Its fraught with difficulty since so little has been published and described from these faunas but will attempt to put something together. All subject to discussion and mistakes. Although the focus there is with the dinosaurs of the Upper Maastrichtian its applicable to most of the other faunas of the Campanian and Lower Maastrichtian ages. Ceratopsian indet. This family of dinosaurs include Triceratops, Torosaurus and other large bodied Ceratopsaian yet to be described. Identifying unguals to a Genus/Species level is impossible and these are best identified as Ceratopsian indet. Ceratopsian unguals are best described as being rugose with many pits/holes on the front perimeter of the ungual. There is also a ledge (more pronounced on some than others) on the ventral side as shown by my red marks. I find it difficult to tell the difference between hand and foot unguals of the same size other than the wings are not has pronounced. The more symmetrical the wings are the closer the ungual is to the midline Digit III. Photos are the best way to show what they look like and here are some from my collection Dorsal view Ungual 1 Ventral View Ungual 1 Dorsal View Ungual 2 Ventral View Ungual 2 Dorsal View Ungual 3 Ventral View Ungual 3 An illustration of a Hand (Manus) A photo of a composite foot Leptoceratops indet. A small Ceratopsian in these faunas is a Leptoceratops. Teeth are the most common material found or sold but there are skeletal elements found. Here is an ungual I found in the Hell Creek. The dorsal view is like an isosceles triangle and very compressed. Dorsal View Ventral View Since these are extremely rare here is an additional photo of a associated set of unguals from the Two Medicine Formation An illustration of an campanian foot An illustration of a digit.
  23. A few years ago most of the smaller theropod teeth from the Hell Creek/Lance Formations were identified based on teeth from the Campanian assemblages of North America. Over the past couple of years new discoveries have shed new light on the theropods of the end of the cretaceous and new species have been described. I have addressed these on separate topics but decided to put all of these together to get a better view of the current picture of the upper Hell Creek and Lance formations. If you see any omissions or errors feel free to let me know. Tyrannosaurs: There are two Tyrannosaurs described Tyrannosaurus rex and Nanotyrannus lancensis Teeth of these two tyrannosaurus can be distinguished between one another however there may be some positional teeth that can be difficult and mimic one another. Denticles on both on both anterior and posterior carinae can be identical in size and shape however the carinae on Rex teeth are more robust. Serration count from my examination is not important on smaller teeth. Nanotyrannus teeth typically do not exceed 2 1/2". The best way to distinguish these teeth is to look at how compressed they are and the cross section at the base of the tooth. Rex dentary teeth are oval at the base and maxillary teeth are a bit more compressed. Some maxillary teeth can appear to look like Nano so other features need to be examined like the robustness of the tip and carinae. Nanotyrannus teeth are unique as tyrannosaurd go, they are very compressed across the entire crown and their cross section at the base is rectangular. Basically Rex teeth are fat and Nano are flat. Here are examples of the cross sections at the base of a couple of Rex teeth under 1 1/2" and adult Nano's Rex (teeth are oval but can vary depending on position.) (Maxillary teeth are more rectangular) This figure represents tyrannosaurid teeth from the Judith River but is applicable to T-rex and shows the cross sectional shape at the base for different positions. 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  Nano (teeth are rectangular) Maxillary T Rex teeth can also take this shape so one needs to consider other features. Looking at compression Rex teeth are fat with robust tips Nano teeth are flatish Aubysodon molnari is a tooth taxon known from unserrated Pre-maxillary teeth. This taxon is a "nomen dubium" dinosaur and premaxillary teeth being sold belong to one of the other two Tyrannosaurs in these assemblages. They should be labeled as "Tyrannosaurid indet" because its impossible to differentiate between species. Albertosaurus sp.is not present in these assemblages Dromaeosaurids: There are only two described Acheroraptor temertyorum and Dakotaraptor steini and Zapsalis sp. is also present. Saurornitholestes and Dromaeosaurs species are not present. Acheroraptor temertyorum Identification: Like all Dromaeosaurid teeth the denticles are key and different between those on the anterior and posterior carinae. You should easily be able to see that the posterior ones are much larger. If the denticles are identical its probably a juvenile Nanotyrannus tooth. Secondly there are apicobasal ridges on the crown which are diagnostic to this species. There can be several on either side and fewer on posterior located teeth. The teeth are recurved and typically under 1/2" (13mm) long. Dakotaraptor steini Identification: Like all Dromaeosaurid teeth the denticles are key and different between those on the anterior and posterior carinae. You should easily be able to see that the posterior ones are much larger. If the denticles are identical its probably a juvenile Nanotyrannus tooth. These teeth are larger than Acheroraptor and lack the ridges seen on the crown. The teeth are recurved and compressed and larger around 7/8" (2-2.3 cm) in the holotype. However dont dismiss smaller teeth, juvenile teeth are around. The holotype serration count per 5mm is (Distal 16-19) and Mesial (19-27) I have yet to find any of these teeth and believe they are not common. Nano teeth can mimic these its all about serrations difference. Zapsalis sp. Identification: Similar to Z. abradens from the Judith River Formation. Very compresses tooth with rounded serrations on the distal side and a smooth mesial edge. One flat tooth surface with longitudinal ridges. Troodontids: There are at least two present Stenonychosaurus sp. and Pectinodon bakkeri. but only one described Pectinodon bakkeri. Stenonychosaurus sp. is an easily recognizable tooth. Denticles strongly hooked and turned toward the tip Pectinodon bakkeri signicantly smaller 6mm or less than Stenonychosaurus teeth. Comb like denticles on posterior carina, lacking on the anterior side.. Positionally these teeth have different morphologies can been see in the photo. Reference from : Vertebrate Microfossil Assemblages by Sankey and Baszio Other Teeth: Paronychodon lacustris type teeth are flat on one side and usually bear three or more longitudinal ridges. The other side is convex and can be smooth or longitudinal ridges can be present as well. Richardoestesia gilmorei. these teeth are quite varied in shape and size and are also common. Some are straight and others are slightly recurved. Denticles are often limited to the posterior carina and individual denticles are minute. If the denticles are present on both carinae they are identical in size. The serrations should look like these (scale .2mm) Richardoestesia isoceles. Typically are very compressed, elongated and form an isosceles triangle. Fine serrations can be present This species along with the Paronychodon is currently under study and will most likely be described to a new taxon which may not be dinosaurian . Albertonykus sp. is known from bones. Its teeth are very small and pointed. Photo of tooth is from the smaller Mongolian species Mononychus olecranus Morph types isolated small theropod teeth are abundant in these assemblages. Morph types exist and determining the taxonomic affinities of these teeth is problematic. So be prepared to identify these teeth as Theropod indet. Note A lot of what I've described here requires a detailed examination of the serrations. The crisper they are on your tooth the better the opportunity you will have to identify them. having some magnification capability helps Bird: Avisaurus archibaldi This tooth is typically sold and known as A. archibaldi. Unfortunately the holotype is known only from one bone a diagnostic tarsometatarsus and NO other skeletal material has been published. So we really do not know if this morphology of tooth belong to this enantiornithine bird. Its probably best ID as Avisaurid indet.
  24. Fantastic Edmontonia tooth

    From the album Wyoming Fossils

    Great condition.
  25. Albertonykus borealis was theropod described by Philip Currie and Nicholas Longrich in 2008 from the lower Maastrichtian of the Horseshoe Canyon Formation in Alberta. Its range also extends into Montana, SD and Wyoming in the Hell Creek and Lance Formation. It is noted for having a single hand claw and is a very small theropod, see photo. Very few folks pay attention to small dinosaurs but this one is very cool and material does come out all of the time so I thought it might be interesting to post. If you collect North American dinosaurs the claws are a must have. Teeth have been found on its Asian cousin Mononykus olecranus but no cranial elements to my knowledge have been found in North America. Maybe one of our forum members can find one or has more information to add. Material found in the Hell Creek and Lance formation should be labeled as cf Albertonykus borealis since nothing has been described from these localities. I've seen hand and foot claws as well as phalanges sold but few sellers know what they have and label them theropod. I've personally collected some specimens and have purchased others. Published literature and the New York Museum of Natural History Mononykus display help pull the picture together for identification of specimens. Hand Claw : They are typically recurved but can be straight. A shallow vascular groove on either side, ventral foramens are present, see second photo (arrow) Carpal : Called the Alular digit and just has one. Photos L to R Medial, Ventral and Dorsal Views Associated Alular Digit : Foot digits in the following post.
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