PalZ

, Volume 91, Issue 1, pp 145–161 | Cite as

The dentition of a well-preserved specimen of Camarasaurus sp.: implications for function, tooth replacement, soft part reconstruction, and food intake

Research Paper

Abstract

The basal macronarian genus Camarasaurus was the most common sauropod in the Upper Jurassic Morrison Formation of North America and is known from several complete and partial skeletons. The specimen used for this study is Camarasaurus sp. SMA 0002 from the Sauriermuseum Aathal, Switzerland. This specimen was found in the Howe-Stephens Quarry, Bighorn Basin, WY, USA. In this study, the dental morphology, characterized by the spatulate, broad-crowned teeth, the tooth replacement pattern, and the function of the dentition and its implications for food intake is described. Features such as the absence of denticles, the wrinkled pattern of the enamel, and the occurrence of large wear facets on older teeth are characteristic for Camarasaurus sp. A slab of sediment with soft tissue impressions ranging up to the middle part of the crown suggests the presence of a gingival soft tissue structure partially covering the teeth. The wrinkled enamel on the crown of the teeth of Camarasaurus sp. and other sauropods is interpreted as indication of this cover of gingival connective tissue. In addition, there possibly was a keratinous beak, which together with the gingiva held the teeth in the jaw and provided stability for teeth in which the root is almost completely resorbed.

Keywords

Camarasaurus sp. Dentition Morphology Function Soft tissue 

Abbreviations

CMNH

Carnegie Museum of Natural History, Pittsburgh, PA, USA

DfmMh/FV

Dinosaurier-Freilichtmuseum Münchehagen/Verein zur Förderung der Niedersächsischen Paläontologie, Münchehagen, Germany

DINO

Dinosaur National Monument, Jensen, UT, USA

GMNH

Gunma Museum of Natural History, Gunma, Japan

MfN

Museum für Naturkunde, Berlin, Germany

SMA

Sauriermuseum Aathal, Aathal, Switzerland

Kurzfassung

Die basale Macronaria-Gattung Camarasaurus war einer der häufigsten Sauropoden der oberjurassischen Morrison-Formation in Nord-Amerika und ist anhand mehrerer vollständig erhaltener Skelettfunde bekannt. Für diese Studie wurde das Exemplar eines Camarasaurus sp. (SMA 0002) des Sauriermuseums Aathal in der Schweiz, untersucht. Dieses Exemplar wurde im Howe-Stephens-Steinbruch im Bighorn Basin, Wyoming, USA, gefunden. In dieser Studie wird die Morphologie der Bezahnung beschrieben, die durch breitkronige, spatelförmige Zähne gekennzeichnet ist. Weiterhin werden der Zahnersatz und die Funktion der Bezahnung sowie die daraus resultierenden Folgen für die Nahrungsaufnahme beschrieben. Diagnostische Merkmale für die Bezahnung von Camarasaurus sp. sind die Abwesenheit von Dentikeln, die Runzelung des Zahnschmelzes und das Auftreten von großen Abrasionsflächen an älteren Zähnen. Eine Struktur mit Hauterhaltung, welche die Zähne bis zur Mitte der Krone bedeckt, deutet auf die Anwesenheit einer zahnfleischähnlichen Struktur hin, welche die Zähne zum Teil bedeckt. Der runzelige Zahnschmelz auf den Zahnkronen von Camarasaurus sp. und anderen Sauropoden wird als ein weiterer Hinweis auf diese zahnfleischartige Struktur interpretiert. Zusätzlich zum Zahnfleisch besaß Camarasaurus wahrscheinlich einen keratinösen Schnabel, der zusammen mit dem Zahnfleisch die Zähne in ihrer Position im Kiefer hielten und Stabilität für Zähne mit fast vollständig resorbierten Wurzeln bot.

Schlüsselwörter

Camarasaurus sp. Bezahnung Morphologie Funktion Weichteilerhaltung 

Notes

Acknowledgements

Our foremost thanks go to Dr. Hans Jakob “Köbi” Siber, director, and Dr. Thomas Bolliger, vice director of the Sauriermuseum Aathal, Switzerland, for collaboration and granting us access to the Camarasaurus sp. SMA 0002. Furthermore, we would like to thank Dr. Ben Papst and Dr. Emanuel Tschopp for providing detailed information about SMA 0002. Many thanks go to Nils Knötschke from the Dinopark Münchehagen, Germany, and Dr. Oliver Wings, formerly at the Museum für Naturkunde, Berlin, Germany, for allowing us to study the Europasaurus and Giraffatitan material under their care. Special thanks go to Dr. Heinrich Mallison for providing the photogrammetric 3D model of the skull of SMA 0002. Members of the DFG Research Unit 533 “Biology of the Sauropod Dinosaurs” are greatly acknowledged for inspiring discussion, especially Katja Waskow and Jessica Mitchell. Special thanks go to Verena Régent for providing access to her unpublished diploma thesis. Funding of this project was provided through DFG grant SA 469/19. This is contribution number 167 of the DFG Research Unit 533 “Biology of the Sauropod Dinosaurs. The Evolution of Gigantism”.

References

  1. Allain, R., and N. Aquesbi. 2008. Anatomy and phylogenetic relationships of Tazoudasaurus naimi (Dinosauria, Sauropoda) from the late Early Jurassic of Morocco. Geodiversitas 30(2): 345–424.Google Scholar
  2. Ayer, J. 2000. The Howe Ranch Dinosaurs. Aathal, Switzerland: Sauriermuseum Aathal.Google Scholar
  3. Barrett, P.M., and P. Upchurch. 2005. Sauropod diversity through time: possible macroevolutionary and paleoecological implications. In Sauropod Evolution and Paleobiology, ed. K.A. Curry-Rogers, and J.A. Wilson, 125–156. Berkeley: University of California Press.Google Scholar
  4. Britt, B.B., R.D. Scheetz, and A. Dangerfield. 2008. A suite of dermestid beetle traces on dinosaur bone from the Upper Jurassic Morrison Formation, Wyoming, USA. Ichnos 15: 59–71.CrossRefGoogle Scholar
  5. Calvo, J.O. 1994. Jaw mechanics in sauropod dinosaurs. GAIA 10: 183–193.Google Scholar
  6. Calvo, J.O., and L. Salgado. 1995. Rebbachisaurus tessonei sp. nov. A new Sauropoda from the Albian-Cenomanian of Argentina; new evidence on the origin of the Diplodocidae. GAIA 11: 13–33.Google Scholar
  7. Carballido, J.L., and D. Pol. 2010. The dentition of Amygdalodon patagonicus (Dinosauria: Sauropoda) and the dental evolution in basal sauropods. Comptes Rendus Palevol 9: 83–93.CrossRefGoogle Scholar
  8. Carballido, J.L., and P.M. Sander. 2013. Postcranial axial skeleton of Europasaurus holgeri (Dinosauria, Sauropoda) from the Upper Jurassic of Germany: implications for sauropod ontogeny and phylogenetic relationships of basal Macronaria. Journal of Systematic Palaeontology 12(3): 335–387.CrossRefGoogle Scholar
  9. Chatterjee, S., and Z. Zheng. 2002. Neuroanatomy of Shunosaurus, a basal sauropod dinosaur from the middle Jurassic of China. Zoological Journal of the Linnean Society of London 136: 145–169.CrossRefGoogle Scholar
  10. Chatterjee, S., and Z. Zheng. 2005. Neuroanatomy and dentition of Camarasaurus lentus. In Thunder-Lizards. The Sauropodomorph Dinosaurs, ed. V. Tidwell, and K. Carpenter, 199–211. Bloomington: Indiana University Press.Google Scholar
  11. Christiansen, P. 2000. Feeding mechanisms of the sauropod dinosaurs Brachiosaurus, Camarasaurus, Diplodocus, and Dicraeosaurus. Historical Biology 14(3): 137–152.CrossRefGoogle Scholar
  12. Chure, D., B.B. Britt, J.A. Whitlock, and J.M. Wilson. 2010. First complete sauropod dinosaur skull from the Cretaceous of the Americas and the evolution of sauropod dentition. Naturwissenschaften 97: 379–391.CrossRefGoogle Scholar
  13. Curry-Rogers, K.A., and C. Forster. 2001. The last of the dinosaur titans: a new sauropod from Madagascar. Nature 412: 530–534.CrossRefGoogle Scholar
  14. Curry-Rogers, K.A., and J.A. Wilson. 2005. The Sauropods. Evolution and Paleobiology. Berkeley: University of California Press.Google Scholar
  15. DeMar, R.E. 1972. Evolutionary implications of Zahnreihen. Evolution 26: 435–450.CrossRefGoogle Scholar
  16. D`Emic, M.D. 2012. The early evolution of titanosauriform sauropod dinosaurs. Zoological Journal of the Linnean Society 166(3): 624–671.CrossRefGoogle Scholar
  17. D’Emic, M.D., J.A. Whitlock, K.M. Smith, D.C. Fischer, and J.A. Wilson. 2013. Evolution of high tooth replacement rates in sauropod dinosaurs. PLoS ONE 8(7): e69235.CrossRefGoogle Scholar
  18. Díez Díaz, V., T. Tortosa, and J. Le Loeuff. 2013. Sauropod diversity in the Latest Cretaceous of south-western Europe: the lessons of odontology. Annales de Paléontologie 99(2): 119–129.CrossRefGoogle Scholar
  19. Díez Díaz, V., F. Ortega, and J.L. Sanz. 2014. Titanosaurian teeth from the Late Cretaceous of “Lo Hueco” (Cuenca, Spain). Cretaceous Research 51: 285–291.CrossRefGoogle Scholar
  20. Edmund, A.G. 1960. Tooth replacement phenomena in lower vertebrates. Royal Ontario Museum, Life Sciences Division Contributions 52: 1–190.Google Scholar
  21. Edmund, A.G. 1969. Dentition. In Biology of the Reptilia Vol. 1: Morphology A, eds. C. Gans, A. d´A. Bellairs, and T.S. Parsons, 117– 200. New York: Academic.Google Scholar
  22. Foster, J.R. 2007. Jurassic West. The Dinosaurs of the Morrison Formation and their World. Life of the Past. Bloomington: Indiana University Press.Google Scholar
  23. Gee, C.T. 2011. Dietary options for the sauropod dinosaurs from an integrated botanical and paleobotanical perspective. In Biology of the Sauropod Dinosaurs: Understanding the Life of Giants, ed. N. Klein, K. Remes, C.T. Gee, and P.M. Sander, 34–56. Bloomington: Indiana University Press.Google Scholar
  24. Hendrickx, C., and O. Mateus. 2014. Torvosaurus gurneyi n. sp., the largest terrestrial predator from Europe, and a proposed terminology of the maxilla anatomy in nonavian theropods. PLoS ONE 9(3): e88905.CrossRefGoogle Scholar
  25. Holwerda, F.M., D. Pol, and O.W.M. Rauhut. 2015. Using dental wrinkling to define sauropod tooth morphotypes from the Cañadón Asfalto Formation, Patagonia, Argentina. PLoS ONE 10(2): e0118100.CrossRefGoogle Scholar
  26. Hummel, J., C.T. Gee, K.-H. Südekum, P.M. Sander, G. Nogge, and M. Clauss. 2008. In vitro digestibility of fern and gymnosperm foliage: implications for sauropod feeding ecology and diet selection. Proceedings of the Royal Society B 275: 1015–1021.CrossRefGoogle Scholar
  27. Ikejiri, T., V. Tidwell, and D.L. Trexler. 2005. New adult specimens of Camarasaurus lentus highlight ontogenetic variation within the species. In Thunder-Lizards. The Sauropodomorph Dinosaurs, eds. V. Tidwell, and K. Carpenter, 154– 179. Bloomington: Indiana University Press.Google Scholar
  28. Janensch W. 1929. Material und Formengehalt der Sauropoden in der Ausbeute der Tendaguru Expedition. Palaeontographica (Supplement 7) 2: 1–34.Google Scholar
  29. Janensch, W. 1935-1936. Die Schädel der Sauropoden Brachiosaurus, Barosaurus und Dicraeosaurus aus den Tendaguruschichten Deutsch-Ostafrikas. Palaeontographica (Supplement 7) 2: 147– 298.Google Scholar
  30. Klein, N., K. Remes, C.T. Gee, and P.M. Sander. 2011. Biology of the Sauropod Dinosaurs: Understanding the Life of Giants. Bloomington: Indiana University Press.Google Scholar
  31. Madsen, J.H.J., J.S. McIntosh, and D.S. Berman. 1995. Skull and atlas-axis complex of the Upper Jurassic sauropod Camarasaurus sp. Cope (Reptilia: Saurischia). Bulletin of the Carnegie Museum of Natural History 31: 1–115.Google Scholar
  32. Marpmann, J.S., J.L. Carballido, P.M. Sander, and N. Knötschke. 2015. Cranial anatomy of the Late Jurassic dwarf sauropod Europasaurus holgeri (Dinosauria, Camarasauromorpha): ontogenetic changes and size dimorphism. Journal of Systematic Palaeontology 13(3): 221–263.CrossRefGoogle Scholar
  33. McIntosh, J.S., C.A. Miles, K.C. Cloward, and J.R. Parker. 1996. A new nearly complete skeleton of Camarasaurus. Bulletin of Gunma Museum of Natural History 1: 1–87.Google Scholar
  34. Michelis, I. 2004. Vergleichende Taphonomie des Howe Quarry (Morrison-Formation, Oberer Jura), Bighorn County, Wyoming, USA. Bonn: Dissertation, Universität Bonn.Google Scholar
  35. Osborn, J.W. 1970. New approach to Zahnreihen. Nature 225: 343–346.CrossRefGoogle Scholar
  36. Owen, R. 1840–1845. Odontography. London: Hippolyte Billiere.Google Scholar
  37. Pol, D., and J.E. Powell. 2007. New information on Lessemsaurus sauropoides (Dinosauria: Sauropodomorpha) from the Upper Triassic of Argentina. Special Papers in Palaeontology 77: 223–243.Google Scholar
  38. Régent, V. 2011. Die Bezahnung des Zwerg-Sauropoden Europasaurus holgeri aus dem Oberjura Norddeutschlands—ontogenetische und funktionelle Muster. Bonn: unpublished Diploma Thesis, Universität Bonn.Google Scholar
  39. Saegusa, H., and Y. Tomida. 2011. Titanosauriform teeth from the Cretaceous of Japan. Anais da Academia Brasileira de Ciências 83(1): 247–265.CrossRefGoogle Scholar
  40. Salgado, L., R.A. Coria, and J.O. Calvo. 1997. Evolution of titanosaurid sauropods. I: Phylogenetic analysis based on the postcranial evidence. Ameghiniana 34: 3–32.Google Scholar
  41. Sander, P.M. 1997. Teeth and jaws. In Encyclopedia of Dinosaurs, ed. P.J. Currie, and K. Padian, 717–725. San Diego: Academic Press.Google Scholar
  42. Sander, P.M. 1999. The microstructure of reptilian tooth enamel: terminology, function, and phylogeny. Münchner Geowissenschaftliche Abhandlungen 38: 1–102.Google Scholar
  43. Sander, P.M. 2000. Long bone histology of the Tendaguru sauropods: implications for growth and biology. Paleobiology 26(3): 466–488.CrossRefGoogle Scholar
  44. Sander, P.M. 2013. An evolutionary cascade model for sauropod gigantism—overview, update and tests. PLoS ONE 8(10): e78573.CrossRefGoogle Scholar
  45. Sander, P.M., T.G. Gee, J. Hummel, and M. Clauss. 2010. Mesozoic plants and dinosaur herbivory. In Plants in Mesozoic Time: Innovations, Phylogeny, Ecosystems, ed. C.T. Gee, 330–359. Bloomington and Indianapolis: Indiana University Press.Google Scholar
  46. Sander, P.M., A. Christian, M. Clauss, R. Fechner, C.T. Gee, E.M. Griebeler, H.C. Gunga, J. Hummel, H. Mallison, S.F. Perry, H. Preuschoft, O.W.M. Rauhut, K. Remes, O. Wings, and U. Witzel. 2011a. Biology of the sauropod dinosaurs: the evolution of gigantism. Biological Reviews 86(1): 117–155.CrossRefGoogle Scholar
  47. Sander, P.M., N. Klein, K. Stein, and O. Wings. 2011b. Sauropod bone histology and its implications for sauropod biology. In Biology of the Sauropod Dinosaurs: Understanding the Life of Giants, ed. N. Klein, K. Remes, C.T. Gee, and P.M. Sander, 276–302. Bloomington: Indiana University Press.Google Scholar
  48. Sander, P.M., O. Mateus, T. Laven, and N. Knötschke. 2006. Bone histology indicates insular dwarfism in a new Late Jurassic sauropod dinosaur. Nature 441: 739–741.CrossRefGoogle Scholar
  49. Sanz, J.L., J.E. Powell, J. LeLoeuff, R. Martinez, and X. Pereda-Suberiola. 1999. Sauropod remains from the Upper Cretaceous of Laño (northcentral Spain), titanosaur phylogenetic relationships. Estudios del Museo de Ciencias Naturales de Nava 14: 235–255.Google Scholar
  50. Schäfer, W. 1962. Aktuo-Paläontologie nach Studien in der Nordsee. Frankfurt am Main: Verlag Waldemar Kramer.Google Scholar
  51. Schwarz, D., J.C.D. Kosch, G. Fritsch, and T. Hildebrandt. 2015. Dentition and tooth replacement of Dicraeosaurus hansemanni (Dinosauria, Sauropoda, Diplodocoidea) from the Tendaguru Formation of Tanzania. Journal of Vertebrate Paleontology 35(6): e1008134.CrossRefGoogle Scholar
  52. Siber, H.-J., and U. Möckli. 2009. The stegosaurs from the Sauriermuseum Aathal. Aathal, Switzerland: Sauriermuseum Aathal.Google Scholar
  53. Smith, J.B., and P. Dodson. 2003. A proposal for a standard terminology of anatomical notation and orientation in fossil vertebrate dentitions. Journal of Vertebrate Paleontology 23(1): 1–12.CrossRefGoogle Scholar
  54. Stevens, K.A. 2013. The articulation of sauropod necks: methodology and mythology. PLoS ONE 8(10): e78572.CrossRefGoogle Scholar
  55. Tschopp, E., O. Mateus, R. Kosma, P.M. Sander, U. Joger, and O. Wings. 2014. A specimen-level cladistic analysis of Camarasaurus (Dinosauria, Sauropoda) and a revision of camarasaurid taxonomy. Journal of Vertebrate Paleontolog, Program and Abstracts: 241.Google Scholar
  56. Tschopp, E., O. Wings, T. Frauenfelder, and B.M. Rothschild. 2016. Pathological phalanges in a camarasaurid sauropod dinosaur and implications on behavior. Acta Palaeontologica Polonica 61(1): 125–134.Google Scholar
  57. Upchurch, P. 1995. Evolutionary history of sauropod dinosaurs. Philosophical Transactions of the Royal Society of London B 349: 365–390.CrossRefGoogle Scholar
  58. Upchurch, P. 1998. The phylogenetic relationships of sauropod dinosaurs. Zoological Journal of the Linnean Society 124: 43–103.CrossRefGoogle Scholar
  59. Upchurch, P., and P.M. Barrett. 2000. The evolution of sauropod feeding mechanisms. In Evolution of Herbivory in Terrestrial Vertebrates: Perspectives from the Fossil Record, ed. H.-D. Sues, 79–122. Cambridge: Cambridge University Press.CrossRefGoogle Scholar
  60. Upchurch, P., P.M. Barrett, and P. Dodson. 2004. Sauropoda. In The Dinosauria, 2nd ed, ed. D.B. Weishampel, P. Dodson, and H. Osmólska, 259–322. Berkeley: Indiana University Press.CrossRefGoogle Scholar
  61. Upchurch, P., and P.M. Barret. 2005. Phylogenetic and taxic perspectives on sauropod diversity. In The Sauropods. Evolution and Paleobiology, eds. K.A. Curry Rogers, and J.A. Wilson, 104– 124. Berkeley and Los Angeles: University of California Press.Google Scholar
  62. von Huene, F. 1926. Vollständige Osteologie eines Plateosauriden aus dem schwäbischen Keuper. Geologische und Paläontologische Abhandlungen 15: 129–179.Google Scholar
  63. Waskow, K., and P.M. Sander. 2014. Growth record and histological variation in the dorsal ribs of Camarasaurus sp. (Sauropoda). Journal of Vertebrate Paleontology 35(4): 852–869.CrossRefGoogle Scholar
  64. Wilson, J.A. 2002. Sauropod dinosaur phylogeny: critique and cladistic analysis. Zoological Journal of the Linnean Society 136: 217–276.CrossRefGoogle Scholar
  65. Wilson, J.A., and P.C. Sereno. 1998. Early evolution and higher-level phylogeny of sauropod dinosaurs. Memoirs of the Society of Vertebrate Paleontology 5: 1–68.CrossRefGoogle Scholar
  66. Whitlock, J.A. 2011. Inferences of diplodocoid (Sauropoda: Dinosauria) feeding behaviour from snout shape and microwear analyses. PLoS ONE 6(4): e18304.CrossRefGoogle Scholar
  67. Whitlock, J.A., and J.M. Richman. 2013. Biology of tooth replacement in amniotes. International Journal of Oral Science 5: 66–70.CrossRefGoogle Scholar
  68. Yates, A.M., M.F. Bonnan, J. Neveling, A. Chinsmy, and M.G. Blackbeard. 2010. A new transitional sauropodomorph dinosaur from the Early Jurassic of South Africa and the evolution of sauropod feeding and quadrupedalism. Proceedings of the Royal Society B 277(1682): 787–794.CrossRefGoogle Scholar
  69. Zaher, H., D. Pol, A.B. Carvalho, P.M. Nascimento, C. Riccomini, P. Larson, R. Juarez-Valieri, R. Pires-Domingues, N. Jorge da Silva, and D. de Almeida Campos. 2011. A complete skull of an Early Cretaceous sauropod and the evolution of advanced titanosaurians. PLoS ONE 6(2): e16663.CrossRefGoogle Scholar

Copyright information

© Paläontologische Gesellschaft 2016

Authors and Affiliations

  1. 1.Steinmann Institute of Geology, Mineralogy and Paleontology, Rheinische Friedrich-Wilhelms-Universität BonnBonnGermany

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