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Crystallography of craniid brachiopods by electron backscatter diffraction (EBSD)

Published online by Cambridge University Press:  01 September 2007

Alberto Pérez-Huerta ,
Jennifer England  and
Maggie Cusack
Alberto Pérez-Huerta
Affiliation:
Department of Geographical and Earth Sciences, University of Glasgow, G12 8QQ, UK. E-mail: [email protected]
Jennifer England
Affiliation:
Department of Geographical and Earth Sciences, University of Glasgow, G12 8QQ, UK. E-mail: [email protected]
Maggie Cusack
Affiliation:
Department of Geographical and Earth Sciences, University of Glasgow, G12 8QQ, UK. E-mail: [email protected]
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Abstract

Electron backscatter diffraction (EBSD) is used to determine the detailed crystallographic orientation of calcite crystals of craniid brachiopods in the context of shell ultrastructure. Sections of shells of two Recent species, Novocrania anomala and Novocrania huttoni, are analysed to provide 3D crystallographic patterns at high spatial resolution. The c-axis of semi-nacre calcite crystals is oriented parallel to the laminae that define the ultrastructure of the secondary layer. This orientation differs from that of rhynchonelliform calcitic brachiopods where the c-axis is perpendicular to the length of morphological fibres and to the shell exterior.

Keywords

Brachiopodacalcitec-axisNovocrania anomalaNovocrania huttonisecondary layersemi-nacre
Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 98 , Issue 3-4: Brachiopod Research into the Third Millenium , September 2007 , pp. 437 - 442
Copyright
Copyright © Royal Society of Edinburgh 2008

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