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Permanent link (DOI): https://doi.org/10.7939/R3HM2G

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Systematics of an Oligocene-Aged Fossil Snake Assemblage from the White River Formation, Wyoming Open Access

Descriptions

Other title
Subject/Keyword
Congerophis
Erycinae
Vertebral Form-Taxa
Phylogeny
Systematics
Ogmophis
Snake
Ungaliophiinae
Calamgras
Assemblage
Charininae
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Croghan, Jasmine A.
Supervisor and department
Caldwell, Michael M (Biological Sciences)
Examining committee member and department
Murray, Alison (Biological Sciences)
Gingras, Murray (Earth and Atmospheric Sciences)
Department
Department of Biological Sciences
Specialization
Systematics and Evolution
Date accepted
2014-01-30T10:34:51Z
Graduation date
2014-06
Degree
Master of Science
Degree level
Master's
Abstract
Extinct snake taxa are primarily recognized from isolated vertebrae. A new specimen from the Oligocene of Wyoming provides a rare opportunity to examine four nearly complete and articulated fossil snakes. Informally assigned previously to the ‘erycine’ vertebral form taxa Ogmophis and Calamagras, a comparison reveals that the diagnostic morphology of both genera are present in a single individual of the new specimen, invalidating these assignments. A new taxon, Congerophis lego is described and erected, and its phylogenetic relationships are tested using two existing morphological datasets of all snakes and of the ‘Erycinae.’ Congerophis lego is found to be in the sister-group position to the New World ‘erycine’ Charina. When Charina and the Old World ‘erycine’ Eryx are scored separately and analyzed with relevant outgroup taxa, the subfamily is found to be non-monophyletic. The new subfamily Charininae, inclusive of Charina and Congerophis, is erected, and the ‘Erycinae’ is redefined as monogeneric.
Language
English
DOI
doi:10.7939/R3HM2G
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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