Phylogenetic Approaches To Reconstructing The Paleobiology Of Anomodont Therapsids Synapsida

Emerging technologies are opening new avenues for the study of past and present ecosystems. Computer-aided visualization and analysis of fossil specimens through X-ray tomography has revolutionized the study of organisms. X-ray tomography, or X-ray computed tomography, is a characterization technique for generating 3D information from 2-dimensional X-ray image slices. X-ray imaging is based on the differential absorption or scattering of an X-ray source to reveal internal attributes of biological specimens. High-resolution tomography can retrieve compositional and structural information of small objects or the macrostructure of larger objects non-destructively, allowing fossils to be characterized in three dimensions and in unprecedented detail. This has enabled paleontologists to gain important insights into the anatomy, development, and preservation of specimens. The resulting digital 3D reconstructions can be used in functional analyses to test hypotheses regarding the paleobiology of extinct organisms that could transform our understanding of long-studied fossil groups, and the narratives of organismal and ecological evolution. Furthermore, this proliferation of digital datasets should make the widespread sharing and dissemination of 3D data possible, providing access to rare fossil material worldwide.

Non-mammalian synapsids were the dominant terrestrial vertebrates from the Late Carboniferous to the Middle Triassic and play a key role in understanding the origin and evolution of mammals. Despite these facts and the outstanding fossil record of the group, early synapsids remain obscure. This book showcases the full breadth of contemporary research on non-mammalian synapsids, ranging from taxonomy and phylogenetics to functional morphology, biogeography, paleoecology, and patterns of diversity. It also underscores the importance and potential of studying non-mammalian synapsid paleobiology in its own right, not just in the context of mammalian evolution.​

The evolution of vertebrate hearing is of considerable interest in the hearing community. However, there has never been a volume that has focused on the paleontological evidence for the evolution of hearing and the ear, especially from the perspective of some of the leading paleontologists and evolutionary biologists in the world. Thus, this volume is totally unique, and takes a perspective that has never been taken before. It brings to the fore some of the most recent discoveries among fossil taxa, which have demonstrated the sort of detailed information that can be derived from the fossil record, illuminating the evolutionary pathways this sensory system has taken and the diversity it had achieved.

This edited volume explores the various views on the origins of tetrapods—amphibians, reptiles, birds, and mammals—views that agree or differ depending in part on how certain fossil animals are classified and which methodology is used for classification. Eighteen chapters by an international group of paleontologists and neontologists here present current hypotheses, emphasizing the kinds of data needed to answer controversial questions, as well as the variety of solutions that emerge from diferent analyses of the same data set. The book is arranged in five sections, each of which contains an overview essay that either describes the development of various schools of thought regarding the origin of the tetrapod group in question or critically summarizes the arguments presented in the section. The first section addresses the origins of tetrapods as a group, focusing on lobe-finned fishes and early tetrapods. Next is a section dealing with amphbians, followed by one on reptiles. The fourth section concerns avian origins, and the final section treats the origins and early diversification of mammals. With an overall goal of stimulating critical evaluation by the reader rather than providing unequivocal answers, this volume will be of particaular interest to vertebrate paleontologists, evolutionary morphologists, and ichthyological, herpatological, avian, and mammalian systematists.