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Permanent link (DOI): https://doi.org/10.7939/R34906

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Phylogeny of the Mosasaurinae (Squamata: Mosasauridae) with descriptions and functional morphology of new and existing mosasaurines Open Access

Descriptions

Other title
Subject/Keyword
Mosasaurine
Aquatic adaptation
Cranial kinesis
Plotosaurus
Morocco
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
LeBlanc, Aaron
Supervisor and department
Caldwell, Michael (Biological Sciences)
Examining committee member and department
Acorn, John (Renewable Resources)
Murray, Alison (Biological Sciences)
Caldwell, Michael (Biological Sciences)
Currie, Philip (Biological Sciences)
Department
Department of Biological Sciences
Specialization

Date accepted
2011-07-15T16:14:01Z
Graduation date
2011-11
Degree
Master of Science
Degree level
Master's
Abstract
Mosasaurs were giant marine squamates that inhabited all of the world’s oceans approximately 93 to 65 Million Years Ago. The subfamily Mosasaurinae is one of the most diverse groups, including the robust-toothed Globidensini and the ichthyosaur-like members of the Plotosaurini (Plotosaurus + Mosasaurus). Eremiasaurus heterodontus, a new mosasaurine from the Maastrichtian of Morocco, is described and added to a comprehensive phylogenetic analysis of the Mosasaurinae. Eremiasaurus heterodontus is recovered as the sister taxon to the Plotosaurini, but possesses features previously considered to be globidensine synapomorphies. As a result, the Globidensini may no longer be considered monophyletic. The cranial anatomy of Plotosaurus bennisoni is also redescribed to highlight a trend towards an increasing level of aquatic adaptation of the skulls of derived mosasaurines. These findings challenge the conventional dichotomy of plotosaurine and globidensine mosasaurs and the evolutionary trends within the Mosasaurinae.
Language
English
DOI
doi:10.7939/R34906
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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