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Found 7 results

  1. I periodically get asked about smaller theropod teeth so this is what I know. If you have additional tooth related information please pass it on. Tanycolagreus topwilsoni The holotype included a fragmented skull with one premaxillary and two lateral teeth. Unfortunately the teeth were crushed with no visible serrations so its unknown how to describe them. Holotype skull Reconstruction Skull of Marshosaurus from Utah Museum of Natural History. So you can see variation of the teeth in jaw If you are interested in finding out more about Holotype skeleton this book is the best around. Carpenter, K., Miles, C., and Cloward, K. (2005). "New small theropod from the Upper Jurassic Morrison Formation of Wyoming." in Carpenter, K. 2005. The Carnivorous Dinosaurs, Indiana University Press: 23-48 Koparion douglassi Oldest known Troodontid and only known from a single maxillary tooth. Picture says it all. A tooth taxon! Scale: A 1 mm, B-F 100 micrometers Chure, D. J. (1994). "Koparion douglassi, a new dinosaur from the Morrison Formation (Upper Jurassic) of Dinosaur National Monument; the oldest troodontid (Theropoda: Maniraptora)." Brigham Young University Geology Studies, 40: 11-15 Coelurus fragilis Known from a fairly complete skeleton however there is a question if the dentary, below, belongs to the skeleton. No teeth were recovered and cannot find any additional information on teeth. Ken Carpenter recently responded to my inquiry about these teeth. He stated that we have no teeth from this dinosaur. Teeth have been called Coelurus because they are small but there is no proof of association Carpenter, K., Miles, C., and Cloward, K. (2005). "New small theropod from the Upper Jurassic Morrison Formation of Wyoming." in Carpenter, K. 2005. The Carnivorous Dinosaurs, Indiana University Press: 23-48 Ornitholestes hermanni Skull with both mandibles are part of the holotype. Osborn et. al (1917) paper just comments that the teeth are small and feeble. Carpenters book mentions that the skull is presently being studied by Mark Norell Carpenter, K., Miles, C., and Cloward, K. (2005). "New small theropod from the Upper Jurassic Morrison Formation of Wyoming." in Carpenter, K. 2005. The Carnivorous Dinosaurs, Indiana University Press: 23-48 Reconstructed Skull AMNH Osborn, Henry Fairfield (1917). "Skeletal adaptations of Ornitholestes, Struthiomimus, Tyrannosaurus". Bulletin of the American Museum of Natural History. 35 (43): 733–771. hdl:2246/1334. Allosaurus Needs to be developed, in the queue Torvosaurus Ceratosaurus Marshosaurus
  2. Torvosaurus tanneri is one of the apex theropods found in the Morrison Formation and has the largest dentition. Teeth of this and other theropods are commonly sold through online Dealers, Auction Houses and at Fossil shows. Just because a site/dealer sells Jurassic material does not guarantee accuracy. Variation of the teeth in the jaw also adds to the complexity. Isolated teeth from the Morrison Formation are very difficult to diagnose and all require an understanding of additional characteristics than normal, in hopes of properly identifying them. I have not been able to find any publication that describes the teeth of this species so it's beyond me how Sellers identify them other that they are big and look like Rex . The best I can do is to look at reference publications which include similar teeth from Portugal which describes Torvosaurus cf. gurneyi. Should be pretty close to Torvosaurus tanneri of the Morrison. Sellers need to provide you the following information: 1)Photo of tooth both sides and one of the mesial edge 2)Serration density of both edges, 5 mm wide at midline 3)Dimensions: CBL, CBW, CH 4)Locality: State and County Mesial teeth CHR : appox 2.75 Crown height ratio CH÷CBL CBR : appox .65 Crown base ratio CBW÷CBL Mesial Density: 7 to 8 per 5 mm, Distal Density: 7 to 8 per 5 mm all at midline. DSDI = 1 ( DSDI : Denticle size density index = Mesial Density ÷ Distal Density) Mesial and distal denticles decrease in size towards the base of the crown and similarly towards the crown apex. Mesial serrations occupy 55 to 65% of the crown height Distal serrations extend to below the cervex Cross-section base : sub-circular Lateral teeth CHR : 1.4 (short crowns), 2.8 (elongated crowns) Crown height ratio CH÷CBL CBR : .35 to .65 Crown base ratio CBW÷CBL Mesial Density: 6 to 9.5 per 5 mm, Distal Density: 6 to 9.5 per 5 mm all at midline. DSDI = 1 ( DSDI : Denticle size density index = Mesial Density ÷ Distal Density) Mesial serrations occupy 40 to 80% of the crown height Distal serrations extend to below the cervex Wide transverse undulations covering most of the tooth are common Isolated tooth of Torvosaurus cf. gurneyi in lingual (C1), labial (C2), mesial (C3), and distal (C4) views, with details of mesial (C5) and distal (C6) denticles, and enamel texture (C7) in lateral views. Reconstruction Skull of Torvosaurus from Utah Museum of Natural History. So you can see variation of the teeth in the jaw Reference: Hendrickx, C., Mateus, O., and Araújo, R. 2015. The dentition of megalosaurid theropods. Acta Palaeontologica Polonica 60 (3): 627–642.
  3. A very informative journal from the Utah Geological Association that focuses on ornithischian dinosaurs from the Morrison Formation which form only about 15% of the dinosaur specimens recovered. What is key for those familar with this assemblage is that this article demonstrates that Nanosaurus agilis is the senior name for Drinker nisti, Othnielosaurus consors, and Othnielia rex. Four valid genera and six species are present: Fruitadens haagaroum, Nanosaurus agilis, Camptosaurus dispar, C. aphanoecetes, Dryosaurus altus, and D. elderae https://www.utahgeology.org/publication/a-photo-documentation-of-bipedal-ornithischian-dinosaurs-from-the-upper-jurassic-morrison-formation-usa/ For tooth lovers
  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 Best Books for Dinosaur Identification Triassic Identification of Dinosaur Teeth from the Triassic of New Mexico Jurassic: Morisson Formation Identification of Theropod Teeth Tips in Buying a Sauropod Foot Claw Ornithischians from the Morisson Formation 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 The Case for Nannotyrannus 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 . Theropod Assemblage of New Jersey 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 Republic of Niger Identification of Theropod Teeth Cretaceous: South America Patagonia's Theropod Teeth Cretaceous: Uzbekistan: Identification of Theropod Teeth: Uzbekistan Sauropod Teeth: Uzbekistan Cretaceous: Europe Identifying Baryonyx Teeth
  5. Occasionally we see dinosaur material from Portugal for sale, mostly theropod teeth, but I post this because the dinosaurs of the Lourinhã Group are very interesting to those of us that are familiar with the Morrison Formation. Information here may help us identify teeth from the Morisson From an abstract: The Lourinhã and Alcobaça formations (in Portugal), Morrison Formation (in North America) an Tendaguru Beds (in Tanzania) can be compared. These three Late Jurassic areas, dated as Kimmeridgian to Tithonian are similar paleoenvironmentally and faunally. Four dinosaur genera are shared between Portugal and the Morrison (Allosaurus, Torvosaurus, Ceratosaurus and Apatosaurus), as well as all non-avian dinosaur families. Late Jurassic Map Portugal has a high diversity of dinosaurs. The Lourinhã Formation is the most notable unit of the group not only noted for teeth & bones but eggs and trackways. The Alcobaça Formation is also included in the group. Here is a geologic look at westcentral Portugal. The coastline is absolutly beautiful and a challenge to collect. Teeth, tracks and bones are typically found in the boulders making extraction a nightmare. Lourhina Fm.pdf
  6. Marshosaurus bicentesimus is a midsize theropod in the Morrison Formation in the Megalosauridae family. Over the past few years, teeth are becoming available in the open market simply because dealers/diggers are now more aware of this species and like to sell them. Isolated teeth from the Morrison Formation are very difficult to diagnose and all require an understanding of additional characteristics than normal, in hopes of properly identifying them. I have not been able to find any publication that describes the teeth of this species so it's beyond me how Sellers identify them. The best I can do is to look at other reference publications some which include similar teeth from Portugal and Germany which describe morph types and then assign them to the best taxon. So until we have a better definition this is a start to get us in the right direction Sellers need to provide you the following information: 1)Photo of tooth and one of the mesial edge 2)Serration density of both edges 5 mm wide at midline 3)Dimensions: CBL, CBW, CH 4) Locality: State and County Three Key Characteristics :. 1) Mesial Carina should extend down 2/3 First and most important since this is a Megalosaurid the anterior carina (serrations) only come 2/3 of the way down the keel. See Photo 2) Serrations on both edges should be different (Hendrickx 2005) The serrations are finer than most other large theropods in the Morrison. Morphologies I've recently seen published show the Distal carina at 4.6/mm and Mesial carina at 5.8/mm. So your tooth may not fit this exactly but there should be a difference with a ratio DSDI is higher than 1.2 in most specimens DSDI : Denticle size density index = Mesial Density ÷ Distal Density 3) Crown Base ratio These teeth are compressed and the ratio looks at that compression Crown Base Width (CBW) ÷ Crown Base Length (CBL) = between 0.45 and 0.65 Representation of teeth that are similar to Marshosaurus Reconstruction Skull of Marshosaurus from Utah Museum of Natural History. So you can see variation of the teeth in jaw Reference: 1) Hendrickx, C., Mateus, O., and Araújo, R. 2015. The dentition of megalosaurid theropods. Acta Palaeontologica Polonica 60 (3): 627–642. 2)Journal of Iberian Geology June 2017, Volume 43, Issue 2 , pp 257-291 Analysis of diversity, stratigraphic and geographical distribution of isolated theropod teeth from the Upper Jurassic of the Lusitanian Basin, Portugal 3) Multivariate and Cladistic Analyses of Isolated Teeth Reveal Sympatry of Theropod Dinosaurs in the Late Jurassic of Northern Germany Oliver Gerke, Oliver Wings Published: July 6, 2016 https://doi.org/10.1371/journal.pone.0158334
  7. Ceratosaurus is one of my favorite Jurassic theropod Dinosaurs found in the Morrison Formation. Teeth of this and other theropods are commonly sold through online Dealers, Auction Houses and at Fossil shows. Just because a site/dealer sells Jurassic material does not guarantee accuracy. . Variation of the teeth in the jaw also adds to the complexity. Isolated teeth from the Morrison Formation are very difficult to diagnose and all require an understanding of additional characteristics than normal, in hopes of properly identifying them. I have not been able to find any publication that describes the teeth of this species, other than anterior ones, so it's beyond me how Sellers identify them. The best I can do is to look at other reference publications some which include similar teeth from Portugal and Germany which describe morph types and then assign them to the best taxon. So until we have a better definition this is a start to get us in the right direction Sellers need to provide you the following information: 1)Photo of tooth and one of the mesial edge 2)Serration density of both edges, 5 mm wide at midline 3)Dimensions: CBL, CBW, CH 4)Locality: State and County Premaxillary & Anterior teeth of Dentary Tooth: CHR : 2.47 - 3.56 Crown height ratio CH÷CBL CBR : .92 - 1.43 Crown base ratio CBW÷CBL Mesial Density: 19 per 5 mm, Distal Density: 11.5 per 5 mm all at midline, DSDI > 1.2 (Denticle Size Density index) Cross-section base : Subcircular Lingual grooves (flutes) are diagnostics and on the lingual side only. Gooves are only present on premaxillary and the anterior three teeth of the dentary. Lateral teeth Tooth: CHR : 1.54 - 2.86 Crown height ratio CH÷CBL CBR : .32 - .5 Crown base ratio CBW÷CBL Mesial Density: 14 per 5 mm, Distal Density: 14 per 5 mm all at midline Cross-section base : very compressed oval Mesial and Distal carina extend to the base If you would like to learn more about Ceratosaurs, bones and teeth there is a great soft covered printing. Ceratosaurs (Dinosauria, Theropoda) A Revised Osteology by Madsen and Welles by the Utah Geological Survey Its also available on PDF but the book is cheap and a great reference guide. If anyone has additional information to add to this please post it. Reconstruction Skull of Ceratosaurus from Utah Museum of Natural History. So you can see variation of the teeth in jaw Reference 1)Journal of Iberian Geology June 2017, Volume 43, Issue 2 , pp 257-291 Analysis of diversity, stratigraphic and geographical distribution of isolated theropod teeth from the Upper Jurassic of the Lusitanian Basin, Portugal 2)Multivariate and Cladistic Analyses of Isolated Teeth Reveal Sympatry of Theropod Dinosaurs in the Late Jurassic of Northern Germany Oliver Gerke, Oliver Wings Published: July 6, 2016 https://doi.org/10.1371/journal.pone.0158334
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