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The ichthyosaurian tailbend: a verification problem facilitated by computed tomography

Published online by Cambridge University Press:  08 April 2016

C. McGowan
C. McGowan*
Affiliation:
Department of Vertebrate Palaeontology, Royal Ontario Museum, Toronto, Ontario, Canada M5S 2C6; and Department of Zoology, University of Toronto, Toronto, Ontario, Canada M5S 1A1
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Abstract

The tailbend, a downward flexure of the vertebral column, is a prominent feature of post-Triassic ichthyosaurs. However, due to the vagaries of preservation and of preparation, its presence cannot be verified in all skeletons. Computed tomography offers a solution to the problem by identifying the wedge-shaped centra that contribute to the tailbend. Leptopterygius tenuirostris appears to have a tailbend, albeit slightly downturned. There is also evidence that its close relative Eurhinosaurus longirostris had a tailbend, too.

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Articles
Information
Paleobiology , Volume 15 , Issue 4 , Fall 1989 , pp. 429 - 436
Copyright
Copyright © The Paleontological Society 

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References

Literature Cited

Conroy, G. C., and Vannier, M. W. 1984. Noninvasive three-dimensional computer imaging of matrix-filled fossil skulls by high-resolution computed tomography. Science 226:456–458.Google Scholar
Conroy, G. C., and Vannier, M. W. 1985. Endocranial volume determination of matrix-filled fossil skulls using high-resolution computed tomography. Pp. 419–426. In Tobias, P. V. (ed.), Hominid Evolution: Past, Present and Future. Alan R. Liss; New York.Google Scholar
Conroy, G. C., and Vannier, M. W. 1987. Dental Development of the Taung skull from computerized tomography. Nature 329:625–627.Google Scholar
Haubitz, B., Prokop, M., Döhring, W., Ostrom, J. H., and Wellnhofer, P. 1988. Computed tomography of Archaeopteryx. Paleobiology 14:206–213.Google Scholar
Hauff, B. 1953. Das Holzmadenbuch. F. Rau; Ohringen, West Germany.Google Scholar
McGowan, C. 1973. Differential growth in three ichthyosaurs: Ichthyosaurus communis, I. breviceps and Stenopterygius quadriscissus (Reptilia, Ichthyosauria). Life Sciences Contributions, Royal Ontario Musuem 93:1–24.Google Scholar
McGowan, C. 1974. A revision of the longipinnate ichthyosaurs of the Lower Jurassic of England, with descriptions of two new species (Reptilia: Ichthyosauria). Life Sciences Contributions, Royal Ontario Museum 97:1–37.Google Scholar
McGowan, C. 1979. A revision of the Lower Jurassic ichthyosaurs of Germany with descriptions of two new species. Palaeontographica A 166:93–135.Google Scholar
McGowan, C. 1986. A putative ancestor for the swordfish-like ichthyosaur Eurhinosaurus. Nature 322:454–456.Google Scholar
McGowan, C. 1989a. Leptopterygius tenuirostris and other long-snouted ichthyosaurs (Reptilia) from the English Lower Lias. Palaeontology 32:409–427.Google Scholar
McGowan, C. 1989b. Computed tomography reveals further details of Excalibosaurus, a putative ancestor for the swordfish-like ichthyosaur Eurhinosaurus. Journal of Vertebrate Paleontology 9:269–281.Google Scholar
Riess, J. 1986. Fortbewegungsweise, Schwimmbiophysik und Phylogenie der Ichthyosaurier. Palaeontographica A 192:93–155.Google Scholar
Taylor, M. A. 1987. Reinterpretation of ichthyosaur swimming and buoyancy. Palaeontology 30:531–535.Google Scholar