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Supersonic sauropods? Tail dynamics in the diplodocids

Published online by Cambridge University Press:  08 February 2016

Nathan P. Myhrvold  and
Philip J. Currie
Nathan P. Myhrvold
Affiliation:
Microsoft Research, One Microsoft Way, Redmond, Washington 98052-6399
Philip J. Currie
Affiliation:
Royal Tyrrell Museum of Palaeontology, Box 7500, Drumheller, Alberta T0J 0Y0 Canada
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Abstract

Computer models of the tail of Apatosaurus louisae show it could reach supersonic velocities, producing a noise analogous to the “crack” of a bullwhip. Similarity in tail structure suggests this was feasible for other diplodocids, and possibly for unrelated sauropods like Mamenchisaurus and the dicraeosaurids. Lengthening of caudal vertebrae centra between positions 18 and 25 is consistent with adaptation to the stresses generated by such tail motion, as is coossification of vertebrae via diffuse idiopathic skeletal hyperostosis (DISH), which occurs in the same region in about half the specimens. The noise produced may have been used for defense, communication, intraspecific rivalry, or courtship, in which case supersonic “cracking” may have been a sexually dimorphic feature. Comparisons with the club-bearing tails of the sauropods Shunosaurus lii and Omeisaurus tianfuensis show the diplodocid whiplash tail was not well adapted as a direct-impact weapon, bringing the tail-as-weapon hypothesis into doubt.

Type
Articles
Information
Paleobiology , Volume 23 , Issue 4 , Fall 1997 , pp. 393 - 409
Copyright
Copyright © The Paleontological Society 

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References

Literature Cited

Allen, M. 1989. The art of the bullwhip. Mark Allen Productions, Las Vegas. [Videotape.]Google Scholar
Alexander, R. McN. 1976. Estimates of speeds of dinosaurs. Nature 261: 129–30.CrossRefGoogle Scholar
Alexander, R. McN. 1985. Mechanics of posture and gait of some large dinosaurs. Zoological Journal of the Linnaean Society 83:1–25.CrossRefGoogle Scholar
Alexander, R. McN. 1989. Dynamics of dinosaurs and other extinct giants. Columbia University Press, New York.Google Scholar
Anderson, J. F., Hall-Martin, A., and Russell, D. A. 1985. Long-bone circumference and weight in mammals, birds and dinosaurs. Journal of Zoology, London A. 207:53–61.CrossRefGoogle Scholar
Auffenberg, W. 1981. The behavioral ecology of the Komodo monitor. University of Florida Press, Gainesville.Google Scholar
Auffenberg, W. 1988. Gray's monitor lizard. University of Florida Press, Gainesville.Google Scholar
Baht, D. N., and Kearney, J. K. 1996. On animating whip-type motions. Journal of Visualization and Computer Animation 7:229–249.3.0.CO;2-R>CrossRefGoogle Scholar
Bakker, R. T. 1975. Experimental and fossil evidence for the evolution of tetrapod bioenergetics. Pp. 365–399in Gates, D. M. and Schmerl, R. B., eds. Perspectives of biophysical ecology. Springer, Berlin.CrossRefGoogle Scholar
Bakker, R. T. 1986. The dinosaur heresies. Morrow, New York.Google Scholar
Bernstein, B., Hall, D. A., and Trent, H. M. 1958. On the dynamics of a bull whip. Journal of the Acoustical Society of America 30:1112–1115.CrossRefGoogle Scholar
Bird, R. T. 1944. Did Brontosaurus ever walk on land? Natural History 53:60–67.Google Scholar
Cavanagh, P. R., and Landa, J. 1976. A biomechanical analysis of the karate chop. The Research Quarterly 47:610–618.Google ScholarPubMed
Christiansen, P. 1996. The “whiplash” tail of diplodocid sauropods: was it really a weapon? In Morales, M., ed. The continental Jurassic. Bulletin of the Museum of Northern Arizona 60:51–58.Google Scholar
Colbert, E. H. 1962. The weights of dinosaurs. American Museum Novitates 2076:1–16.Google Scholar
Coombs, W. P. 1975. Sauropod habits and habitats. Palaeogeography, Palaeoclimatology, Palaeoecology 17:1–33.CrossRefGoogle Scholar
Coria, R. A. 1994. On a monospecific assemblage of sauropod dinosaurs from Patagonia: implications for gregarious behavior. Gaia 10:209–213.Google Scholar
Czerkas, S. A. 1992. Discovery of dermal spines reveals a new look for sauropod dinosaurs. Geology 20:1068–1070.2.3.CO;2>CrossRefGoogle Scholar
Dodson, P. 1990. Sauropod paleobiology. Pp. 402–407in Weishampel, D. B., Dodson, P., and Osmolska, H., eds. The Dinosauria. University of California Press, Berkeley and Los Angeles.Google Scholar
Dong, Z. M., Peng, G. Z., and Huang, D. X. 1989. The discovery of the bony tail clubs of sauropods. Vertebrata PalAsiatica 27:219–224.Google Scholar
Garland, T. 1983. The relationship between maximal running speed and body mass in terrestrial mammals. Journal of Zoology 199: 157–70.CrossRefGoogle Scholar
Gear, C. W. 1971. Numerical initial value problems in ordinary differtial equations. Prentice-Hall, Englewood Cliffs, N.J.Google Scholar
Gertsch, L. 1994. Dinosaur tail dynamics. In Nelson, G. E., ed. The dinosaurs of Wyoming. Wyoming Geological Association 44th Annual Field Conference Guidebook:25–38.Google Scholar
Gillette, D. D. 1991. Seismosaurus halli, gen. et sp. nov., a new sauropod dinosaur from the Morrison Formation (Upper Jurassic/Lower Cretaceous) of New Mexico, USA. Journal of Vertebrate Paleontology 11:417–433.CrossRefGoogle Scholar
Gilmore, C. W. 1925. A nearly complete articulated skeleton of Camarasaurus, a saurischian dinosaur from the Dinosaur National Monument. Memoirs of the Carnegie Museum 10:347–384.CrossRefGoogle Scholar
Gilmore, C. W. 1932. On a newly mounted skeleton of Diplodocus in the United States National Museum. United States National Museum Proceedings 81 (Art. 18):1–21.CrossRefGoogle Scholar
Gilmore, C. W. 1936. Osteology of Apatosaurus, with special reference to specimens in the Carnegie Museum. Memoirs of the Carnegie Museum 11:175–300.CrossRefGoogle Scholar
Hatcher, J. B. 1901. Diplodocus (Marsh): its osteology, taxonomy and probable habits, with a restoration of the skeleton. Memoirs of the Carnegie Museum 1:1–63.CrossRefGoogle Scholar
Hatcher, J. B. 1903. Additional remarks on Diplodocus. Memoirs of the Carnegie Museum 2:72–75.Google Scholar
Holland, W. J. 1915. Heads and tails; a few notes relating to the structure of the sauropod dinosaurs. Annals of the Carnegie Museum 9:273–278.CrossRefGoogle Scholar
Janensch, W. 1929. Die Wirbelsaule der Gattung Dicraeosaurus. Palaeontographica Supplement 7:27–93.Google Scholar
Jorgensen, T. Jr. 1970. On the dynamics of the swing of a golf club. Americal Journal of Physics 38:644–651.CrossRefGoogle Scholar
Joris, H. J. J., Edwards van Muyen, A. J., van Ingen Schenau, G. J., and Kemper, H. C. G. 1985. Force, velocity and energy flow during the overarm throw in female handball throwers. Journal of Biomechanics 18:409–414.CrossRefGoogle Scholar
Knowledge Revolution. 1995. Working Model (software package and associated documentation). Knowledge Revolution, San Mateo, Calif.Google Scholar
Knowledge Revolution. 1996. World Wide Web site, http://www.krev.com.Google Scholar
Kreighbaum, E., and Barthels, K. M. 1990. Biomechanics, a qualitative approach for studying human movement. Macmillan, New York.Google Scholar
Lockley, M. G., Houck, K. J., and Prince, N. K. 1986. North America's largest dinosaur trackway site: implications for Morrison paleoecology. Geological Society of America Bulletin 97:1163–1176.2.0.CO;2>CrossRefGoogle Scholar
Moodie, R. L. 1916. Two caudal vertebrae of a sauropodous dinosaur exhibiting a pathological lesion. American Journal of Science 41:530–531.CrossRefGoogle Scholar
Moodie, R. L. 1923. Paleopathology. University of Chicago Press, Chicago.CrossRefGoogle ScholarPubMed
Morgan, D. 1972. Whips and whipmaking. Cornell Maritime Press, Centerville, Md.Google Scholar
Osborn, H. F. 1899. A skeleton of Diplodocus. Memoirs of the American Museum of Natural History 1:191–214.Google Scholar
Rothschild, B. M., and Berman, D. S. 1991. Fusion of caudal vertebrae in Late Jurassic sauropods. Journal of Vertebrate Paleontology 11:29–36.CrossRefGoogle Scholar
Russell, D. A., and Zheng, Z. 1993. A large mamenchisaurid from the Junggar Basin, Xinjiang, People's Republic of China. Canadian Journal of Earth Sciences 30:2082–2095.CrossRefGoogle Scholar
Terauds, J. 1978. Computerized biomechanical analysis of selected javelin throwers at the 1976 Montreal Olympics. Track and Field Quarterly Review 78:29–31.Google Scholar
Thulborn, R. A. 1982. Speeds and gaits of dinosaurs. Palaeogeography, Palaeoclimatology, Palaeoecology 38: 227–56.CrossRefGoogle Scholar
Thulborn, R. A. 1990. Dinosaur tracks. Chapman and Hall, New York.CrossRefGoogle Scholar
Young, C. C., Bien, M. N., and Mi, T. H. 1972. Mamenchisaurus from Ho Chuan. Academia Sinica, Institute of Vertebrate Paleontology and Paleoanthropology Monographs A 8:1–30. [In Chinese.]Google Scholar