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Found 14 results

  1. Troodon

    This 2019 is getting better and better ! Here is my new drawing,its Troodon! Hope you like it. Darko
  2. I thought I’d post some of my favorite claws from my collection. I’m curious what people think about my ID on one of them and I have no idea what the last one is. ID help with that one would be great! (All measurements are straight line) Spinosaurus hand claw 4 1/2” Kem Kem Beds, Morocco Repairs, but I see no restoration Acheroraptor Temerytorum foot walking claw 1 7/8” Hell Creek Carter County, Montana No repair or restoration (at first). However, the tip broke off during molding and it was lost. 1/16” restoration done to the tip now Two Acheroraptor killing claws. The larger one is 3 1/8” and the smaller is 1 9/16” Hell Creek Powder River County, Montana Large claw has restoration to the top 1/4” of the articulation end and 3/4” to the tip Smaller claw has restoration on 5/8” of the tip Same claw as above, with size perspective Other side... Acheroraptor Temertyorum digit I hallux claw 7/8” Hell Creek Slope County, North Dakota No repair or restoration Acheroraptor Temertyorum hand claw 1 1/4” Hell Creek Powder River County, Montana Restoration to 1/2” of the tip I originally thought this this was a Pachycephalosaurus claw, but Troodon’s posting on TFF makes me now believe it’s Thescelosaurus Hell Creek Powder River County, Montana No repair or restoration Side view.. Troodontid walking foot claw 1 1/16” Hell Creek Wibeaux County, Montana Looks like restoration to 1/4” of the tip Possible Microraptorine hand claw 5/8” Hell Creek Carter County, Montana Small amount of restoration to the top of the articulating end and 1/8” of the tip Same claw... Microraptorine killing claw. Related to Hesperonychus sp. 7/8” Hell Creek South Dakota Restoration to 3/16” of the tip Same claw for size comparison... Curious what people think of this one.. I believe it to be a Troodontid killing claw 3/4” Two Medicine Formation Unfortunately, no locality info on it Looks like the tip was glued back on, but no restoration Other side... Now I have no clue what this could be and I’d love some help. I bought it as a new collector awhile ago with very little knowledge. It was sold as a baby Anzu foot claw and the seller said Black Hills Museum ID’d it. I think it’s actually mammalian. Any thoughts? Size comparison Articulating end (sorry for the poor pics)
  3. I saw these teeth for sale and the Id's look squirrely but I'm not an expert so look for a positive ID. All from Hell Creek Formation The seller identifies this as a Troodon tooth 1/4" looks more like a Pectinodon The others are being sold as Dromaeosaurus/Raptor All are 1/2" or less. They look like juvie Nanotyrannus
  4. Possible Troodontid foot claw

    Hello everyone! Was wondering if this is a Troodontid foot claw. Seller says it was found in Hell Creek FM in Harding County South Dakota. Says it’s 1” long.
  5. Possible Troodontid tooth

    Hi, Saw what looks to be some kind of troodontid tooth online. Was wondering if anyone could ID it. Tooth is from Judith River formation and appears to measure less than an inch. Thanks.
  6. Troodontology

    sizetheropusapalaiosOntootroodontologgigant_the_Occurrence_of_Exceptionally_Large.pdf
  7. Recent, I came across several teeth from Kem Kem which intrigued me. At first thought, they reminded me of Troodon teeth, though their serrations were nowhere as big. One seller labelled it as theropoda indet. Another called it Masiakasaurus. I thought they might even be Abelisaurid teeth. What are your thoughts on these?
  8. Here are picks of my favorite dinosaur teeth that I have in my collection- "Troodon".
  9. http://www.timescolonist.com/hips-don-t-lie-unearthed-dinosaur-pelvic-bones-shake-up-family-tree-1.21715300 "As a result, Troodon formosus is no longer considered a valid species" (and @Troodon might have to change his name )
  10. 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.
  11. Protoceratops Egg?

    I just acquired what looks to be a very unusual egg. This single egg comes detached from a clutch of upright eggs in an antique shop in Singapore; owner would not reveal where it origins from. The egg is white, and covered in reddish-sand matrix that can be scrapped off with a needle. This egg measures 7.66 cm long (I lack measurement of the nest, owner wouldn't let me take more pics). My first thought were that these are Troodon eggs, as "upright eggs" are a characteristic of troodon eggs as far as I know. 1) Thomas(Tom) Kapitany said these looks like it came from China. He didn't personally give it an ID, but mentioned he had seen these identified as Protoceratops before. 2) Seth Sorenson said there's no way to confirm it as Troodon without skeletal material, but he said they look like small ceratopsian eggs to him. He also mentioned Protoceratops eggs have been found in standing clutches before. 3) Laogao, a fossil egg expert from China said this looks like Troodon eggs from Henan. 4) Dr. Kenneth Carpenter said these are most likely theropod eggs of the Elongatoolithus(egg oogenera) family. Without microscopic examination or confirmation of their origin, he could not give any further identification though. With such little information, I am aware there's no way to give a definitive ID of the dinosaur that laid these eggs. I'd still like to ask for your opinions though on what you believe this egg might be.
  12. Troodon tooth

    From the album Dinosaur Fossils collection

    Troodon tooth Locality: Hell Creek Montana, USA Geological Age: Cretaceous Specimen Size: 0.45 cm
  13. Dinosaur Intelligence

    Hello everyone, I've been researching dinosaur intelligence, and have read about certain dinosaurs who were considered more intelligent than most others. From what I gather, even the cleverer dinosaurs were left in the dust by modern birds and mammals, yet dinosaurs were apparently very smart for reptiles... I've read that Ankylosaurids were exceedingly unintelligent, and that Troodon were brilliant for their time. The intellect of Ornithomimus is speculated by some to have been akin to that of an ostrich, and Tyrannosaurus Rex apparently had a fairly large section of its brain specifically devoted to strategy. I know animal intelligence (even human intelligence) is tough to measure, and I'd imagine that DINOSAUR intelligence can only be 100% more difficult. With that said, what I'm trying to ask is: How intelligent do you think dinosaurs were relative to today's birds, mammals and reptiles? How dim were massive sauropods and ankylosaurids compared to very dim modern animals? Was Troodon really just as smart as an opossum? Obviously this requires a lot of wild speculation, but it'd still be fun to hear your thoughts. I know there are people on this forum who specialize their interests and knowledge in particular dinosaurs, so please fire away. Thanks! Lauren
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