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Book Chapter

Waves of bone deposition on the rostrum of the pterosaur Pteranodon

By
S. Christopher Bennett
S. Christopher Bennett
Department of Biological Sciences, Fort Hays State University, Hays, KS 67601, USA
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Paul Penkalski
Paul Penkalski
The Geology Museum, 1215 W. Dayton St., Madison, WI 53706, USA
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Published:
January 01, 2018

Abstract:

Four specimens of the pterosaur Pteranodon exhibit patterns of irregular alternating light and dark bands on the lateral surfaces of the upper jaw anterior to the nasoantorbital fenestra. Examinations reveal that the maxilla and premaxilla of Pteranodon consisted of two thin sheets of bone interconnected by regularly spaced septa with the spaces contained within presumably pneumatized, resulting in a structure analogous to modern honeycomb sandwich panels. The alternating light and dark bands resulted from waves of bone deposition moving anteriorly along the external surface of the lateral sheet of bone and laying down thin laminae of new bone while bone was simultaneously resorbed from the internal surface of the lateral sheet to maintain its thickness. The specimens that exhibit the bands were immature males and no banding was found in mature specimens or immature females. Therefore, the presence of the bands in immature males is interpreted as correlated with the enlargement and reshaping of the rostrum as males approached and attained sexual maturity.

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Contents

Geological Society, London, Special Publications

New Perspectives on Pterosaur Palaeobiology

D.W. E. Hone
D.W. E. Hone
Queen Mary University of London, UK
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M. P. Witton
M. P. Witton
University of Portsmouth, UK
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D. M. Martill
D. M. Martill
University of Portsmouth, UK
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The Geological Society of London
Volume
455
ISBN electronic:
9781786203366
Publication date:
January 01, 2018

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