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Swiss Journal of Geosciences

, Volume 103, Issue 2, pp 235–240 | Cite as

A model for the bite mechanics in the herbivorous dinosaur Stegosaurus (Ornithischia, Stegosauridae)

  • Miriam Reichel
Article

Abstract

Although the herbivorous dinosaur Stegosaurus (Ornithischia, Stegosauridae) is a well-described Late Jurassic taxon, little is known about the feeding habits and biomechanics of its homodont dentition. The presence of a rhamphotheca has been suggested, but it is still unknown how much such structure would have participated in the foraging behaviour of Stegosaurus. To better understand the feeding mechanism of this taxon, three-dimensional models of a Stegosaurus tooth were created, using the software ZBrush®. One model was simple and lacked serrations, whereas the other model included serrations. Those models were then transferred to the software Strand7®, where finite element analyses took place. The models were given material properties of enamel, based on studies done with crocodilian and mammalian teeth. In addition to that, bite forces were calculated for Stegosaurus, based on skull proportions. The results show little difference between the force distributions on the serrated and non-serrated models, indicating an efficient mechanism of stress dissipation that avoids high stresses being transferred to the jaw bones during biting. Digital plant models were also created to test the calculated bite forces in Stegosaurus, which suggests this animal was capable of biting through smaller branches. Computer modelling and analyses provide additional information about feeding habits and plant preferences for Stegosaurus, and can be adapted for studying other comparable herbivorous taxa.

Keywords

Stegosaurus Tooth Biomechanics Morrison Formation Finite element (FE) Digital plant model 

Institutional abbreviations

SMA

Sauriermuseum Aathal, Switzerland

USNM

National Museum of Natural History, Smithsonian Institution (formerly United States National Museum), Washington DC, USA

Notes

Acknowledgments

Thanks to H. J. “Kirby” Siber for organizing the Symposium on Stegosauria and arranging for student travel funding. Additional thanks to Emanuel Tschopp, Jean-Paul Billon-Bruyat, Eric Snively, Philip J. Currie for great help with figures, suggestions on the manuscript and ideas for this project. Thanks to Emily Rayfield and Daniela Schwarz-Wings for reviews and helpful comments. Alberta Ingenuity and Natural Sciences and Engineering Research Council of Canada provided funding for this project.

References

  1. Abler, W. L. (1992). The serrated teeth of tyrannosaurid dinosaurs, and biting structures in other animals. Paleobiology, 18, 161–183.Google Scholar
  2. Anderson, P., Gill, P., & Rayfield, E. (2009). How the cingula of basal mammal teeth may alleviate strain in the enamel caused by a soft food diet. Journal of Vertebrate Paleontology, 29(Suppl. 3), 54A.Google Scholar
  3. Bamman, M. W., Newcomer, B. R., Larson-Meyer, D., Weisner, R. L., & Hunter, G. R. (2000). Evaluation of the strength-size relation in vivo using various muscle size indices. Medicine and Science in Sports and Exercise, 32, 1307–1313.CrossRefGoogle Scholar
  4. Barrett, P. M. (2001). Tooth wear and possible jaw action of Scelidosaurus harrisonii Owen and a review of feeding mechanisms in other thyreophoran dinosaurs. In K. Carpenter (Ed.), The armored dinosaurs (pp. 25–52). Bloomington, IN: Indiana University Press.Google Scholar
  5. Bell, P. B., Snively, E., & Shychosky, L. A. (2009). Comparison of the jaw mechanics in hadrosaurid and ceratopsid dinosaurs using finite element analysis. The Anatomical Record, 292, 1338–1351.CrossRefGoogle Scholar
  6. Boresi, A. P., & Schmidt, R. J. (2003). Advanced mechanics of materials. New York: Wiley, 681 pp.Google Scholar
  7. Creech, J. E. (2004). Phylogenetic character analysis of crocodylian enamel microstructure and its relevance to biomechanical performance. Unpublished Masters thesis, Florida State University, Tallahassee, 59 pp.Google Scholar
  8. Currey, J. D. (2002). Bones: structure and mechanics (436 pp). New Jersey: Princeton University Press.Google Scholar
  9. Czerkas, S. (1998). The lips, beaks, and cheeks of ornithischians. Journal of Vertebrate Paleontology, 18(Suppl. 3), 37A.Google Scholar
  10. Czerkas, S. (1999). The beaked jaw of stegosaurs and their implications for other ornithischians. In D. D. Gillette (Ed.). Vertebrate paleontology in Utah (Vol. 99, pp. 143–150). Miscellaneous Publications of Utah Geological Survey.Google Scholar
  11. Edmund, A. G. (1969). Dentition. In C. Gans, et al.: Biology of the reptilia—morphology A (Vol. 1, pp. 117–200). London, UK: Academic Press.Google Scholar
  12. Erickson, G. M., Van Kirk, S. D., Su, J., Levenston, M. E., Caler, W. E., & Carter, D. R. (1996). Bite-force estimation for Tyrannosaurus rex from tooth-marked bones. Nature, 382, 706–707.CrossRefGoogle Scholar
  13. Farke, A. A. (2008). Frontal sinuses and head-butting in goats: a finite element analysis. Journal of Experimental Biology, 211, 3085–3094.CrossRefGoogle Scholar
  14. Galton, P. M., & Upchurch, P. (2004). Stegosauria. In D. B. Weishampel et al. (Eds.), The Dinosauria (2nd ed., pp. 343–362). Berkeley: University of California Press.Google Scholar
  15. Hwang, S. H. (2005). Phylogenetic patterns of enamel microstructure in dinosaur teeth. Journal of Morphology, 266, 208–240.CrossRefGoogle Scholar
  16. Lin, C.-J., Wang, S.-Y., Yang, T.-H., & Tsai, M.-J. (2006). Compressive strength of young Taiwania (Taiwania cryptomerioides) trees grown with different thinning and pruning treatments. Journal of Wood Sciences, 52, 337–341.CrossRefGoogle Scholar
  17. Manly, R. S., Hodge, H. C., & Ange, L. E. (1939). Density and refractive index studies of dental hard tissues: II. Density distribution curves 1, 2. Journal of Dental Research, 18, 203–211.Google Scholar
  18. Marsh, O. C. (1877). New order of extinct Reptilia (Stegosauria) from the Jurassic of the Rocky Mountains. American Journal of Science, 14, 513–514.Google Scholar
  19. McHenry, C. R. (2009). Devourer of gods: the paleoecology of the Cretaceous pliosaur Kronosaurus queenslandicus. Unpublished Ph.D. dissertation, University of Newcastle, 635 pp.Google Scholar
  20. Ostrom, J. H., & McIntosh, J. S. (1966). Marsh’s dinosaurs—the Collections from Como Bluff (2nd ed., 388 pp). New Haven: Yale University Press.Google Scholar
  21. Papp, M. J., & Witmer, L. (1998). Cheeks, beaks or freaks: A critical appraisal of buccal soft-tissue anatomy in ornithischian dinosaurs. Journal of Vertebrate Paleontology, 18(Suppl. 3), 69A.Google Scholar
  22. Parrish, J. T., Peterson, F., & Turner, C. E. (2004). Jurassic “savannah”—plant taphonomy and climate of the Morrison Formation (Jurassic western USA). Sedimentary Geology, 167, 139–164.CrossRefGoogle Scholar
  23. Rees, J. S., & Hammadeh, M. (2004). Undermining of enamel as a mechanism of abfraction lesion formation: a finite element study. European Journal of Oral Sciences, 112, 347–352.CrossRefGoogle Scholar
  24. Snively, E., & Russell, A. P. (2007). Craniocervical feeding dynamics of Tyrannosaurus rex. Paleobiology, 33, 610–638.CrossRefGoogle Scholar
  25. Waters, N. E. (1980). Some mechanical and physical properties of teeth. In J. F. V. Vincent & J. D. Currey (Eds.), The mechanical properties of biological materials. Society of Experimental Biology, 34th Symposium. The mechanical properties of biological materials (pp. 99–135). Cambridge: Cambridge University Press.Google Scholar

Copyright information

© Swiss Geological Society 2010

Authors and Affiliations

  1. 1.Department of Biological SciencesUniversity of AlbertaEdmontonCanada

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