Abstract

The first two chapters of this dissertation detail the study of the newly recovered Holland Farm nodosaur (SMU 77100) from the Eagle Ford Group (95.29 ± 0.04 MA) of Mansfield in north central Texas. The objectives of this research are (1) to describe the anatomy of the Holland Farm nodosaur, (2) to determine its phylogenetic position within Ankylosauria, (3) to elaborate the substantial differences in body size and osteoderm morphology in armored dinosaurs occurring in north central Texas during the short duration of the Late Albian and Early Cenomanian, and (4) to provide a radiometric date for the lowermost member of the Eagle Ford Group in Dallas County.

The third chapter of this work tests the potential for large bodied Cretaceous marine diapsids to maintain elevated body temperatures, as suggested by a number of recent studies. This analysis focuses on comparing the body temperature of two mosasaurines, Globidens phosphaticus and Prognathodon kianda, with that of poikilotherms from the Bench 19 fauna of Bentiaba, Angola. This locality is temporally well constrained, and allows for the comparison of body temperature among sympatric taxa, which has not been feasible in previous studies of this nature. Evidence of elevated body temperatures will greatly enhance our understanding of the paleobiology of one of the dominant groups of Late Cretaceous marine predators.

The fourth chapter of this dissertation is a continuation of my master’s research describing the anatomy, ontogeny, and paleoecology of a new pipid frog from the Miocene of Ethiopia. In addition to naming a new genus of xenopodine pipid, this chapter advocates for the recognition of Silurana as a genus distinct from Xenopus. The new pipid named here provides morphological support and a chronologic framework to existing molecular studies in support of Silurana

Degree Date

12-2018

Document Type

Dissertation

Department

Earth Sciences

Advisor

Dr. Louis L. Jacobs

Second Advisor

Michael J. Polcyn

Third Advisor

Dr. Neil J. Tabor

Fourth Advisor

Dr. Dale A. Winkler

Fifth Advisor

Dr. John G. Wise

Subject Area

Earth, Atmospheric and Marine Sciences

Format

.pdf

Creative Commons License

Creative Commons Attribution-Noncommercial 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial 4.0 License

Available for download on Friday, November 29, 2019

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