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Permanent link (DOI): https://doi.org/10.7939/R33G78

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External and internal structure of ankylosaur (Dinosauria; Ornithischia) osteoderms Open Access

Descriptions

Other title
Subject/Keyword
dinosaur
Ankylosauria
osteoderm
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Burns, Michael
Supervisor and department
Currie, Philip (Biological Sciences)
Examining committee member and department
Vickaryous, Matt (Biomedical Sciences, University of Guelph)
Caldwell, Michael (Biological Sciences)
Begg, David (Anatomy)
Department
Department of Biological Sciences
Specialization

Date accepted
2010-08-20T16:59:48Z
Graduation date
2010-11
Degree
Master of Science
Degree level
Master's
Abstract
Here I assess the use of osteoderms in systematics with comparative material from fossil and extant tetrapod taxa. Putative differences among three groups (ankylosaurid, nodosaurid, and polacanthid) were evaluated. Archosaur osteoderms have cortices surrounding a cancellous core. Ankylosaurs are united by a superficial cortex distinguishable from the core, lack of Sharpey’s fibers, and mineralized structural fibers. Nododsaurids lack a deep cortex and have dense superficial cortical fibres. Ankylosaurid osteoderms are thinner than those of other ankylosaurs. Polacanthids (and some nodosaurids and ankylosaurids) have a cancellous core. Cortical thickness overlaps among groups, so a thick cortex is not diagnostic for polacanthids. Modified elements diverge histologically from the primitive condition for specific functions. Haversian bone in the core is not indicative of any group. Some shapes and superficial textures are diagnostic for specific taxa. Parsimony analyses show support for the Ankylosauridae and Nodosauridae, but not a monophyletic polacanthid clade.
Language
English
DOI
doi:10.7939/R33G78
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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