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Permanent link (DOI): https://doi.org/10.7939/R3S65Z

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Comparative Analysis of the Anatomy of the Myxinoidea and the Ancestry of Early Vertebrate Lineages Open Access

Descriptions

Other title
Subject/Keyword
vertebrate
gnathostome
cyclostome
lamprey
neural crest
phylogeny
origin
cranial nerve
head
muscle
chordate
evolution
cartilage
hagfish
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Miyashita, Tetsuto
Supervisor and department
Palmer, A. Richard (Biological Sciences)
Currie, Philip J. (Biological Sciences)
Examining committee member and department
Murray, Alison M. (Biological Sciences)
Hall, Brian K. (Dalhousie University)
Department
Department of Biological Sciences
Specialization
Systematics and Evolution
Date accepted
2012-09-27T14:08:47Z
Graduation date
2012-09
Degree
Master of Science
Degree level
Master's
Abstract
The question of whether a hagfish is a true vertebrate or not has profound implications about the ancestry of the clade. New anatomical evidence allows a test of their systematic position. With dissections and serial sections of original specimens, and with a literature review, a comparative analysis revealed homologues in the chondrocranium and musculature of hagfish shared with lampreys, gnathostomes, and extinct jawless vertebrates. The analysis also identified intermediate characters that foreshadow gnathostomes, including a possible precursor of the synovial joint and tendon-like pseudocartilages. However, the hierarchical organization of the homologues presented an enormous challenge to recovering a phylogenetic signal. The traditional morphological view of the vertebrate head was overturned to formulate new evolutionary models for the ancestry of vertebrates and the origin of the gnathostome jaw. A phylogenetic analysis placed hagfish more basal than other living vertebrates, and a new definition was proposed for the clade Vertebrata.
Language
English
DOI
doi:10.7939/R3S65Z
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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