Download or read book Two New Oligocene Desmostylians and a Discussion of Tethytherian Systematics written by Daryl P. Domning and published by . This book was released on 1986 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new genus, comprising two new species of desmostylians, is described from marine Oligocene deposits of the Pacific Northwest. Behemotops proteus, new genus, new species, is based on an immature mandibular ramus and apparently associated skeletal fragments from the middle or (more likely) upper Oligocene lower part of the Pysht Formation of Clallam County, Washington. A related new species, Behemotops emlongi, is founded on a mandibular ramus of an old individual and a mandibular fragment with canine tusk from the uppermost Oligocene (early Arikareean equivalent) Yaquina Formation of Lincoln County, Oregon. The two new species are the most primitive known desmostylians and compare favorably with the primitive Eocene proboscideans Anthracobune and Moeritherium, and to the still more primitive tethythere Minchenella from the Paleocene of China.For many years the Desmostylia were widely regarded as members of the mammalian order Sirenia before being accepted as a taxon coordinate with the Sirenia and Proboscidea (Reinhart, 1953). On the basis of cladistic analysis we go a step further and regard the Desmostylia as more closely related to Proboscidea than to Sirenia because the Desmostylia and Proboscidea are interpreted herein to share a more recent common ancestor than either order does with the Sirenia. This analysis also suggests that the common ancestor of the Proboscidea and Desmostylia (but not the Sirenia) had suppressed P5 and the original last molar. These characters may be convergent with some other mammals. The Superorder Tokotheria McKenna, 1975, was originally thought to be characterized by loss of both P5 and M3. However, because early sirenians do not show these losses, they may have occurred independently in the common ancestor of proboscideans and desmostylians and in various other tokotheres.The late Paleocene genus Minchenella Zhang, 1980, from China, is a suitable candidate to be the common ancestor of both the Desmostylia and the Proboscidea. It possesses a small entoconid II on M3. The Eocene genus Lammidhania Gingerich, 1977, from Pakistan, and the late Paleocene and/or early Eocene Chinese and Mongolian phenacolophids had not acquired an entoconid II on M3 but are otherwise similar to Minchenella and the anthracobunids. The Asiatic occurrence of phenacolophids, Lammidhania, Minchenella, and anthracobunids suggests an Asian origin for the Proboscidea and is in accord with the exclusively Pacific distribution of the Desmostylia.We believe that desmostylians were amphibious herbivores that fed on marine algae and angiosperms, and that at least the earlier taxa depended to a large extent on plants exposed in the intertidal zone.
Download or read book Two New Oligocene Desmostylians and a Discussion of Tethytherian Systematics written by Daryl P. Domning and published by . This book was released on 1986 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Two new Oligocene desmostylians and a discussion of tethytherian systematics written by Daryl P. Domning and published by . This book was released on 1986 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Two New Oligocene Desmostylians and a Discussion Od Tethytherian Systematics written by Daryl P. Domming and published by . This book was released on 1986 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1986 with total page 976 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monthly Catalogue United States Public Documents written by and published by . This book was released on 1986 with total page 980 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Current Topics in Developmental Biology written by and published by Elsevier. This book was released on 2004-12-07 with total page 261 pages. Available in PDF, EPUB and Kindle. Book excerpt: Current Topics in Developmental Biology provides a comprehensive survey of the major topics in the field of developmental biology. The volumes are valuable to researchers in animal and plant development, as well as to students and professionals who want an introduction to cellular and molecular mechanisms of development. The series has recently passed its 30-year mark, making it the longest-running forum for contemporary issues in developmental biology. This volume contains six important contributions from leading minds in developmental biology. * Presents major contemporary issues and astonishing discoveries at the forefront of modern developmental biology, stem cells, cloning, and regenerative medicine * Series Editor Gerald Schatten is one of the leading minds in reproductive and developmental science * The longest-running forum for current issues in developmental biology with over 30 years of coverage
Download or read book Neptune s Ark written by David Rains Wallace and published by Univ of California Press. This book was released on 2007-05-14 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spanning five hundred million years of evolution, a study of marine life along the Pacific coast of North America captures the remarkable diversity of creatures, past and present, that have made the habitat their home, from ancient giant sea cows and flightless toothed birds, to modern-day orcas and sea otters.
Download or read book Phylogeography of California written by Kristina A. Schierenbeck and published by Univ of California Press. This book was released on 2014-08-26 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phylogeography of California examines the evolution of a variety of taxaÑancient and recent, native and migratoryÑto elucidate evolutionary events both major and minor that shaped the distribution, radiation, and speciation of the biota of California. The book also interprets evolutionary history in a geological context and reviews new and emerging phylogeographic patterns. Focusing on a region that is defined by physical and political boundaries, Kristina A. Schierenbeck provides a phylogeographic survey of CaliforniaÕs diverse flora and fauna according to their major organismal groups. Life history and ecological characteristics, which play prominent roles in the various outcomes for respective clades, are also considered throughout the work. Supporting scholars and researchers who study evolutionary diversification, the book analyzes research that helps assess one of the major challenges in phylogeographic studies: understanding changes in population structures shaped by geological and geographical processes. California is one of only twenty-five acknowledged biological hotspots worldwide, and the phylogeographic history of the state can be extrapolated to study other regions in western North America. Further consideration is given to implications for conservation, recommendations concerning the biogeographic provinces that roughly define the state of California, and predictions related to climate change.
Download or read book Information and Technology Report written by and published by . This book was released on 1995 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Marine Mammals written by Annalisa Berta and published by Elsevier. This book was released on 2005-12-14 with total page 575 pages. Available in PDF, EPUB and Kindle. Book excerpt: Berta and Sumich have succeeded yet again in creating superior marine reading! This book is a succinct yet comprehensive text devoted to the systematics, evolution, morphology, ecology, physiology, and behavior of marine mammals. The first edition, considered the leading text in the field, is required reading for all marine biologists concerned with marine mammals. Revisions include updates of citations, expansion of nearly every chapter and full color photographs. This title continues the tradition by fully expanding and updating nearly all chapters. Comprehensive, up-to-date coverage of the biology of all marine mammals Provides a phylogenetic framework that integrates phylogeny with behavior and ecology Features chapter summaries, further readings, an appendix, glossary and an extensive bibliography Exciting new color photographs and additional distribution maps
Download or read book Smithsonian Contributions to Paleobiology written by and published by . This book was released on 1984 with total page 682 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bringing Fossils to Life written by Donald R. Prothero and published by Columbia University Press. This book was released on 2013-11-12 with total page 690 pages. Available in PDF, EPUB and Kindle. Book excerpt: The leading textbook in its field, this work applies paleobiological principles to the fossil record while detailing the evolutionary history of major plant and animal phyla. It incorporates current research from biology, ecology, and population genetics. Written for biology and geology undergrads, the text bridges the gap between purely theoretical paleobiology and solely descriptive invertebrate paleobiology books, emphasizing the cataloguing of live organisms over dead objects. This third edition revises art and research throughout, expands the coverage of invertebrates, includes a discussion of new methodologies, and adds a chapter on the origin and early evolution of life.
Download or read book Eocene Oligocene Climatic and Biotic Evolution written by Donald R. Prothero and published by Princeton University Press. This book was released on 2014-07-14 with total page 583 pages. Available in PDF, EPUB and Kindle. Book excerpt: The transition from the Eocene to the Oligocene epochs was the most significant event in earth history since the extinction of dinosaurs. As the first Antarctic ice sheets appeared, major extinctions and faunal turnovers took place on the land and in the sea, eliminating forms adapted to a tropical world and replacing them with the ancestors of most of our modern animal and plant life. Through a detailed study of climatic conditions and of organisms buried in Eocene-Oligocene sediments, this volume shows that the separation of Antarctica from Australia was a critical factor in changing oceanic circulation and ultimately world climate. In this book forty-eight leading scientists examine the full range of Eocene and Oligocene phenomena. Their articles cover nearly every major group of organisms in the ocean and on land and include evidence from paleontology, stable isotopes, sedimentology, seismology, and computer climatic modeling. The volume concludes with an update of the geochronologic framework of the late Paleogene. Originally published in 1992. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.
Download or read book Population Biology of the Florida Manatee written by Thomas J. O'Shea and published by . This book was released on 1995 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a collection of papers presented at a 1992 technical workshop on manatee population biology, sponsored by the U.S. Fish and Wildlife Service and the Florida Department of Natural Resources. Topics covered include manatee research programs, techniques for studying manatee population biology, and reports of completed studies. The book concludes with recommendations from the workshop and a brief synopsis of pertinent work that has been published since the workshop.
Download or read book The Beginning of the Age of Mammals written by Kenneth D. Rose and published by JHU Press. This book was released on 2006-10-31 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the tradition of G. G. Simpson's classic work, Kenneth D. Rose's The Beginning of the Age of Mammals analyzes the events that occurred directly before and after the mysterious K-T boundary which so quickly thrust mammals from obscurity to planetary dominance. Rose surveys the evolution of mammals, beginning with their origin from cynodont therapsids in the Mesozoic, contemporary with dinosaurs, through the early Cenozoic, with emphasis on the Paleocene and Eocene adaptive radiations of therian mammals. Focusing on the fossil record, he presents the anatomical evidence used to interpret behavior and phylogenetic relationships. The life's work of one of the most knowledgeable researchers in the field, this richly illustrated, magisterial book combines sound scientific principles and meticulous research and belongs on the shelf of every paleontologist and mammalogist.
Download or read book Primate Biogeography written by Shawn M. Lehman and published by Springer Science & Business Media. This book was released on 2006-11-28 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt: Primate Biogeography is a subject rarely addressed as a discipline in its own right. This comprehensive source introduces the reader to Primate Biogeography as a discipline. It highlights the many factors that may influence the distribution of primates, and reveals the wide range of approaches that are available to understanding the distribution of this order. The biogeography of primates in the past is a major component of our understanding of their evolutionary history and is an essential component of conservation biology. This book will appeal to primatologists, physical anthropologists, zoologists, and undergraduates in these areas.
