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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

The comparative osteology and phylogenetic relationships of lepidosirenid lungfishes

Criswell, Katharine Elizabeth 15 July 2011 (has links)
Lepidosirenidae is a clade of freshwater lungfishes that comprise the South American Lepidosiren paradoxa and four African species of the genus Protopterus. These two genera have been geographically separated since the Early Cretaceous break-up of Gondwana, but they share similar biology and skeletal morphology. The lepidosirenid species traditionally were distinguished by a combination of features such as head-to-body ratios, the number of pairs of vertebral ribs, and the presence or absence of external gills, but there are no published discrete skeletal characteristics and no published comparative studies including all extant species. I used High Resolution X-Ray Computed Tomography (CT), X-Ray photography, and alcohol-preserved, cleared-and-stained, and dry skeletal specimens from museum collections to describe the skeletal morphology of all species of lepidosirenid lungfishes in a comparative context. I digitally disarticulated the bones in each CT scan to compile a comprehensive comparative atlas of the cranial and pectoral elements of all extant lungfish. I discovered that the anocleithrum in Lepidosiren paradoxa, which was previously thought to be lacking, is actually present. I also identified skeletal differences between species in the frontoparietal, parasphenoid, supraorbital, and suboperculum. I incorporated those characters into the first morphological phylogenetic analysis to determine the interrelationships of the lepidosirenids. I also used previously published molecular sequence data from the ribosomal RNA gene 16s to run combined morphological and molecular phylogenetic analyses. To generate phylogenetic hypotheses using different types of data and different methods of determining phylogeny, I employed the maximum parsimony, maximum likelihood, and Bayesian inference methods. Lepidosirenidae is monophyletic in almost all analyses, Protopterus is monophyletic in each analysis, and Protopterus annectens and Protopterus aethiopicus are sister taxa in every analysis. The phylogenetic positions of Protopterus dolloi and Protopterus amphibius are incongruent in many of the analyses, which indicates that further examination of the skeletal variation and addition of molecular sequences of different genes is needed. Based on the comparative morphological atlas and the phylogenetic analyses, questions of lepidosirenid biogeography, morphological variation within lungfish, and better identification of lungfish fossils can now be investigated in a more rigorous context. / text
2

Survey of Comparative Human and Non-human Osteology: Common Florida Species

Dewey, Jennifer 01 December 2013 (has links)
Forensic anthropologists are tasked with the responsibility of identifying human remains in a forensic context. This includes differentiating between human and non-human osteological remains, and further determining a species-specific identification when presented with nonhuman material. Previous research has provided manuals that are typically limited to one class of animal and includes either photographs or descriptions of cranial or post-cranial skeletal elements. Further, the available resources generally cover a limited number of species from Florida#s diverse habitat. Therefore, the intent of this thesis was to compile a comprehensive comparative osteological guide of local Florida species that addressed both cranial and postcranial skeletal elements. The first aspect of this research was to identify the most common Florida species typically analyzed in a medicolegal context. At the same time, represented examples were identified at the class level for birds, reptiles, and marine mammals. Next, the analysis consisted of detailed photographic documentation of cranial and post-cranial skeletal elements at three collections. The Anthropology Department teaching lab at UCF and the Biology Department Vertebrate Collection at UCF as well as the University of Florida#s Zooarchaeology Comparative Collection. The images were then edited to highlight the most diagnostic features exhibited among the different taxonomic families. These results were then complied into a series of guidelines to aid in a family and species-specific identification to be used during an investigation when presented with a whole skeleton, a single skeletal element, or fragmentary remains.
3

Comparative Morphometrics of the Sacral Vertebra in <em>Aneides</em> (Caudata: Plethodontidae).

Schaaf, Lisa Nicole 08 May 2010 (has links) (PDF)
The genus Aneides (Caudata: Plethodontidae) is an arboreal salamander with a prehensile tail and a distribution that spans North America. It is hypothesized that adaptations for arboreality will be visible in the osteology of the sacral vertebra either by qualitative analysis or linear and morphometric analysis in comparison with other plethodontid salamanders. This study demonstrates that while qualitative and quantitative analyses are successful at making genus-level distinctions between taxa, identification to lower taxonomic levels remains inconclusive. Linear morphometrics and dorsal Procrustes landmarks were the most successful metrics to identify known taxa. Two unidentified fossil salamander sacral vertebrae from Oregon Caves National Monument are examined with the same techniques and are tentatively identified as Hydromantes based on qualitative similarities to modern Hydromantes specimens, as the quantitative analyses were unable to confidently diagnose the unknown specimens.
4

Identification of Avian Remains from Covesea Cave 2 on the Moray Firth Coast, Northeastern Scotland

22 March 2022 (has links)
No / The Covesea Caves, located on the coast of the Moray Firth in northeastern Scotland, are a series of archaeological cave sites that are hypothesized to be part of a larger mortuary complex used during the Late Prehistoric period. Although much attention has been given to the unusual assemblage of human remains recovered from these sites, there has been less analysis undertaken on the vast amount of archaeofauna from the caves. This is in the process of being rectified through the recent work of the Covesea Cave Project, under direction of Ian Armit and Lindsey Büster and currently being undertaken at the University of Bradford. This report details attempts to confirm species identifications for several faunal bones of interest through various methodologies; unfortunately, not all of the attempts were successful. However, identifications are confirmed for two avian bones using comparative osteological analysis at the Avian Anatomical Collection at the Natural History Museum at Tring, United Kingdom. These species are placed in context through consideration of previous excavations at the Covesea Caves, as well as recent literature on ornithological analyses of ritual and funerary sites in Later Prehistoric Britain.
5

The comparative biology of Fluttering shearwater and Hutton's shearwater and their relationship to other shearwater species

Wragg, Graham January 1985 (has links)
The discovery and taxonomic history of fluttering shearwater (Puffinus gavia (Forster) and Hutton's shearwater (Puffinus huttoni Mathews) are reviewed. Taxonomic theory, where appropriate to this thesis, is discussed. The external morphology of P. gavia and P. huttoni is compared. No single external measurement or plumage character separates more than 60% of birds examined. The best system of identification is to compare the ratio of different body parts within an individual bird. The distribution of P. gavia and P. huttoni is compared. Hutton's shearwater feeds further out to sea and it is believed to be a migrant species wintering in north west Australian waters. The fluttering shearwater is believed to be a semi-migrant species with only the juveniles spending time in south east Australia. The red cell enzymes of P. gavia, P. huttoni and P. griseus are compared. There are differences in two esterase loci between gavia and huttoni, while P. griseus is more distantly related. Nei's genetic identity values are calculated. The systematic value of electrophoretic data is discussed. The relationship of an undescribed subfossil shearwater to P. gavia and P. huttoni is discussed. An outgroup analysis to other shearwater species is carried out according to phylogenetic (cladistic) theory. The subfossil shearwater is most closely related to the fluttering shearwater, and these two form a sister group to Hutton's shearwater. These three species are a sister group of P. opisthomelas. The relationship between the many P. assimilis subspecies, the black-backed Manx shearwaters, and the gavia, huttoni and opisthomelas group was not resolved. Puffinus nativitatis is more closely related to the Manx and the little shearwaters than to the P. griseus, P. tenuirostris group.

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