Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"squamates"”.
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Seasonal Changes in the Morphology of the Uterus of the Oviparous Lizard <em>Saproscincus mustelinus</em> and the Reproductively Bimodal Lizard <em>Saiphos equalis</em>.
… Viviparity in reptiles is found only in the squamates. Among the more than 100 origins of viviparity in squamates, many have occurred fairly recently and as a result some species contain populations of both reproductive modes, i.e., are reproductively bimodal. The evolution of viviparity is …
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Movement and Life History Aspects of the Pygmy Rattlesnake in Southwest Missouri
… Pygmy rattlesnakes feed mainly on small squamates but also prey on small mammals. Pygmy rattlesnakes are viviparous and also prey on small mammals. Pygmy rattlesnakes are viviparous and appear to be on a biennial reproductive cycle. Adult snakes are easily maintained in captivity and …
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Rise of present-day tetrapods in the paleotropics of Late Triassic equatorial Pangaea: new insights from microvertebrate data
… evidence for the Triassic acquisition in stem squamates and non-squamate lepidosaurs of dental features conserved in living squamates. The third chapter uses apomorphy-based identifications to describe the vertebrate diversity of the Thunderstorm Ridge site (PFV 456), providing evidence for the …
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Inferring Extinct Reptilian Response To Global Warming: Insights From Modern Stable Isotope Ratios
… I identify xenosaurid and glyptosaurine squamates and alethinophidian snakes. The xenosaurid is one of the youngest representatives of Restes rugosus, and I provide the first testable hypothesis of its ecology. These δ¹⁸O values corroborate hypotheses of a wet, tropical environment, and …
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The ecomorphology of facultative bipedality in Lepidosauria: implications for the evolution of reptilian bipedality
… with substrate preference in a derived clade of squamates: Episquamata. Findings suggest that there is no correlation between substrate and a facultative locomotor mode, instead indicating that facultative bipedality is an exaptation of anatomies associated with vertically diverse environments. …
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Stratigraphy and Palaeontology of the Late Cretaceous Wapiti Formation, west-central Alberta, Canada
… the latest Cretaceous, including dinosaurs, squamates, and fresh-water fishes and reptiles. Lastly, in order to better characterize the Wapiti Formation, major marker beds were described: these include several bentonites (altered volcanic ash deposits) which have been documented over an area …
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Optimizing pharmacodynamics and evaluating echocardiographic effects of alfaxalone sedation in bearded dragons (Pogona vitticeps) and prairie rattlesnakes (Crotalus viridis)
… preservatives. Previous research performed in squamates focuses on evaluating one route of administration at one or more doses and monitoring the effects of alfaxalone on that species (i.e. heart rate, respiratory rate, depth of sedation (Bertelsen 2011, Ferreira 2019, James 2018, …
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Body Size Histories in Cenozoic Reptiles From Global to Community Scales
… in the Late Miocene in all groups except for squamates. This finding refutes the claim that, following the extinction of the dinosaurs, terrestrial mammals were unique in experiencing an ecological release allowing them to fill large-bodied niches. Trends also show association between size …
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Phylogeny and evolution of Lerista (Lygosominae, Scincidae, Squamata).
… available model for studying limb reduction in squamates. Nonetheless, lack of a well-resolved phylogeny has impeded investigation of the pattern and mode of limb reduction and loss within the clade. The primary goal of my research was to furnish a comprehensive phylogenetic hypothesis for …
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Fossoriality In Snakes: Perspectives From Morphology And The Fossil Record
Snakes are a speciose clade of squamates that have diversified into almost all habitats, all with the same elongate limbless body plan. This thesis aims to improve scientific understanding of snake evolution by focusing on novel perspectives using both extant snakes and the fossil record. 1. …
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Evolution of Axial Skeleton Diversity across Reptilia
… sampled taxa, extant crocodilians, most extant squamates, and many extant birds are just as regionalized as sampled mammals. This implies greater degrees of axial skeleton diversity across vertebrates than previously thought and presents the potential for uncovering similar complexity in axial …
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Evolutionary Patterns of Avian Tetrodotoxin Resistance
… same resistance-associated substitutions seen in squamates, implying a shared evolutionary toolbox of allowable changes; in birds, these substitutions appear in a patchy, transition-rich pattern that is not easily attributable to TTX exposure, highlighting background constraints and recurrent …
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Evolution of reptile diversity in tropical savannas - a study across scales and continents
… ecological and genomic diversity of squamates from both continents. The thesis is composed of four primary research chapters and two appendices. Each chapter has its own dataset and they collectively address different topics, at varying geographic and taxonomic scales. In chapter 1, I …
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Evolution of reptile diversity in tropical savannas - a study across scales and continents
… ecological and genomic diversity of squamates from both continents. The thesis is composed of four primary research chapters and two appendices. Each chapter has its own dataset and they collectively address different topics, at varying geographic and taxonomic scales. In chapter 1, I …
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Branching out: A comparative analysis of demographic determinants of mammalian speciation
… empirical attention, but mostly across birds and squamates. The point of this thesis is to ask what factors regulate the demographic determinants of speciation in mammals, and how these relationships shape macroevolutionary patterns of speciation and species richness. The thesis is divided into …
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Pattern and Mechanism of Calcium Mobilization During Embryonic Development in a Viviparous Snake, <em>Virginia striatula</em>.
<p>Yolk supplies the majority of embryonic calcium in snakes. Oviparous and viviparous snakes also receive calcium late in development from the eggshell and placenta, respectively. The pattern and mechanism of calcium transport are partly understood for oviparous snakes. I studied a viviparous …