Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Early Vertebrates PDF full book. Access full book title Early Vertebrates by Philippe Janvier. Download full books in PDF and EPUB format.
Author: Philippe Janvier Publisher: Oxford University Press on Demand ISBN: 9780198526469 Category : Science Languages : en Pages : 408
Book Description
This book presents our current knowledge of the early vertebrates, which were mainly fish, but included some land vertebrates, and lived 470 to 250 million years ago. It centres on anatomical and phylogenetic questions, but includes information about fossil discovery and preparation, as wellas the analysis of the characteristics from which their relationships may be reconstructed. It addresses critically both old and new problems in the evolution of certain anatomical structures and deals briefly with the animals' way of life, extinction, and former distribution.In addition, the author gives a potted history of the field of vertebrate palaentology and the rise of cladistics, a cmajor methodological revolution in comparative biology. The book is the first in this field to use a cladistic approach. For each major vertebrate group, the reader will find a diagram or relationships, or cladogram, with a selection of characters at each node, and a succinct phlyogenetic classification.
Author: Philippe Janvier Publisher: Oxford University Press on Demand ISBN: 9780198526469 Category : Science Languages : en Pages : 408
Book Description
This book presents our current knowledge of the early vertebrates, which were mainly fish, but included some land vertebrates, and lived 470 to 250 million years ago. It centres on anatomical and phylogenetic questions, but includes information about fossil discovery and preparation, as wellas the analysis of the characteristics from which their relationships may be reconstructed. It addresses critically both old and new problems in the evolution of certain anatomical structures and deals briefly with the animals' way of life, extinction, and former distribution.In addition, the author gives a potted history of the field of vertebrate palaentology and the rise of cladistics, a cmajor methodological revolution in comparative biology. The book is the first in this field to use a cladistic approach. For each major vertebrate group, the reader will find a diagram or relationships, or cladogram, with a selection of characters at each node, and a succinct phlyogenetic classification.
Author: Per Erik Ahlberg Publisher: CRC Press ISBN: 0203468031 Category : Nature Languages : en Pages : 433
Book Description
A multi-author volume Major Events in Early Vertebrate Evolution examines the origin and early evolution of the backboned animals (vertebrates)-the group which comprises all fishes, amphibians, reptiles, birds and mammals, including ourselves. This volume draws together evidence from fossils, genes, and developmental biology (the study of how embry
Author: Rainer R. Schoch Publisher: John Wiley & Sons ISBN: 1118759133 Category : Science Languages : en Pages : 564
Book Description
This book focuses on the first vertebrates to conquer land and their long journey to become fully independent from the water. It traces the origin of tetrapod features and tries to explain how and why they transformed into organs that permit life on land. Although the major frame of the topic lies in the past 370 million years and necessarily deals with many fossils, it is far from restricted to paleontology. The aim is to achieve a comprehensive picture of amphibian evolution. It focuses on major questions in current paleobiology: how diverse were the early tetrapods? In which environments did they live, and how did they come to be preserved? What do we know about the soft body of extinct amphibians, and what does that tell us about the evolution of crucial organs during the transition to land? How did early amphibians develop and grow, and which were the major factors of their evolution? The Topics in Paleobiology Series is published in collaboration with the Palaeontological Association, and is edited by Professor Mike Benton, University of Bristol. Books in the series provide a summary of the current state of knowledge, a trusted route into the primary literature, and will act as pointers for future directions for research. As well as volumes on individual groups, the series will also deal with topics that have a cross-cutting relevance, such as the evolution of significant ecosystems, particular key times and events in the history of life, climate change, and the application of a new techniques such as molecular palaeontology. The books are written by leading international experts and will be pitched at a level suitable for advanced undergraduates, postgraduates, and researchers in both the paleontological and biological sciences.
Author: Christian F. Kammerer Publisher: Springer Science & Business Media ISBN: 9400768419 Category : Science Languages : en Pages : 332
Book Description
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.
Author: Florence Louise Marlow Publisher: Morgan & Claypool Publishers ISBN: 161504051X Category : Family & Relationships Languages : en Pages : 221
Book Description
Eggs of all animals contain mRNAs and proteins that are supplied to or deposited in the egg as it develops during oogenesis. These maternal gene products regulate all aspects of oocyte development, and an embryo fully relies on these maternal gene products for all aspects of its early development, including fertilization, transitions between meiotic and mitotic cell cycles, and activation of its own genome. Given the diverse processes required to produce a developmentally competent egg and embryo, it is not surprising that maternal gene products are not only essential for normal embryonic development but also for fertility. This review provides an overview of fundamental aspects of oocyte and early embryonic development and the interference and genetic approaches that have provided access to maternally regulated aspects of vertebrate development. Some of the pathways and molecules highlighted in this review, in particular, Bmps, Wnts, small GTPases, cytoskeletal components, and cell cycle regulators, are well known and are essential regulators of multiple aspects of animal development, including oogenesis, early embryogenesis, organogenesis, and reproductive fitness of the adult animal. Specific examples of developmental processes under maternal control and the essential proteins will be explored in each chapter, and where known conserved aspects or divergent roles for these maternal regulators of early vertebrate development will be discussed throughout this review. Table of Contents: Introduction / Oogenesis: From Germline Stem Cells to Germline Cysts / Oocyte Polarity and the Embryonic Axes: The Balbiani Body, an Ancient Oocyte Asymmetry / Preparing Developmentally Competent Eggs / Egg Activation / Blocking Polyspermy / Cleavage/ Mitosis: Going Multicellular / Maternal-Zygotic Transition / Reprogramming: Epigenetic Modifications and Zygotic Genome Activation / Dorsal-Ventral Axis Formation before Zygotic Genome Activation in Zebrafish and Frogs / Maternal TGF-β and the Dorsal-Ventral Embryonic Axis / Maternal Control After Zygotic Genome Activation / Compensation by Stable Maternal Proteins / Maternal Contributions to Germline Establishment or Maintenance / Perspective / Acknowledgments / References
Author: Philippe Janvier Publisher: Oxford University Press, USA ISBN: Category : Language Arts & Disciplines Languages : en Pages : 416
Book Description
This book presents current knowledge of the early vertebrates--mainly fish, but including some terrestrial creatures--which lived about 250 to 470 million years ago. The work focuses on anatomical and phylogenetic questions, but includes information on fossil discovery and preparation, as well as the analysis of the characteristics from which their relationships may be reconstructed. The author addresses both new and old problems in the evolution of certain anatomical details and deals briefly with the animals' way of life, extinction, and former distribution. The book is the first in its field to use a cladistic approach. For each major vertebrate group, the reader will find a diagram of relationships, or cladogram, with a selection of characters at each node, and a succinct phylogenetic classification.
Author: Henry Gee Publisher: University of Chicago Press ISBN: 022640319X Category : Science Languages : en Pages : 325
Book Description
“Addresses an important topic for biologists and zoologists about vertebrates’ place in the ‘grand scheme’ . . . genuinely witty and charming . . . magnificent.” —Neil J. Gostling, University of Southampton Our understanding of vertebrate origins and the backbone of human history evolves with each new fossil find and DNA map. Many species have now had their genomes sequenced, and molecular techniques allow genetic inspection of even non-model organisms. But as longtime Nature editor Henry Gee argues in Across the Bridge, despite these giant strides and our deepening understanding of how vertebrates fit into the tree of life, the morphological chasm between vertebrates and invertebrates remains vast and enigmatic. As Gee shows, even as scientific advances have falsified a variety of theories linking these groups, the extant relatives of vertebrates are too few for effective genetic analysis. Moreover, the more we learn about the species that do remain—from sea-squirts to starfish—the clearer it becomes that they are too far evolved along their own courses to be of much use in reconstructing what the latest invertebrate ancestors of vertebrates looked like. Fossils present yet further problems of interpretation. Tracing both the fast-changing science that has helped illuminate the intricacies of vertebrate evolution as well as the limits of that science, Across the Bridge helps us to see how far the field has come in crossing the invertebrate-to-vertebrate divide—and how far we still have to go. “A beautiful ode to some of the least appreciated animals . . . guides the reader joyfully through deuterostomes—weaving disparate elements of embryology, paleontology, and morphology into an unprecedented and accessible narrative.” —Jakob Vinther, University of Bristol
Author: Philippe Janvier
Author: Philippe Janvier
Author: Per Erik Ahlberg
Author: Rainer R. Schoch
Author: Christian F. Kammerer
Author: Michael R. Voorhies
Author: Thom Holmes
Author: Florence Louise Marlow
Author: Philippe Janvier
Author: Zerina Johanson
Author: Henry Gee