Descriptive And Comparative Osteology Of The Oldest Fossil Squirrel Protosciurus Rodentia Sciuridae
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Descriptive And Comparative Osteology Of The Oldest Fossil Squirrel Protosciurus Rodentia Sciuridae
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Author : Robert J. Emry
language : en
Publisher:
Release Date : 1982
Descriptive And Comparative Osteology Of The Oldest Fossil Squirrel Protosciurus Rodentia Sciuridae written by Robert J. Emry and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with Science categories.
The early history of the Sciuridae is not well known, squirrels being generally poorly represented in the Tertiary fossil record. A nearly complete skeleton, recently discovered in early Oligocene deposits of Wyoming, represents what may be the oldest fossil squirrel known. For the first time, this early squirrel can be compared fully with its extant relatives. The specimen, assigned to Protosciurus jeffersoni, retains the primitive protrogomorphous zygomasseteric structure, as in other known Protosciurus, but the masseteric fossa of the mandible is farther forward than in most nonsciurid protrogomorphs. The auditory region of the skull has derived squirrel characters, but it is in the postcranial skeleton where similarities to extant squirrels are most apparent. Except for minor differences in joint construction, the skeleton is strikingly similar to that of Sciurus niger, the living fox squirrel. It differs from extant ground squirrels in the more gracile proportions of its long bones and asymmetry of foot construction. This early member of the squirrel family was clearly an arboreal squirrel, with morphology, and presumably habits, very similar to those of extant Sciurinae.
Descriptive And Comparative Osteology Of The Oldest Fossil Squirrel Protosciurus Rodentia Sciuridae
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Author : Francis M. Hueber
language : en
Publisher:
Release Date : 1969
Descriptive And Comparative Osteology Of The Oldest Fossil Squirrel Protosciurus Rodentia Sciuridae written by Francis M. Hueber and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with Foraminifera categories.
Descriptive And Comparative Osteology Of The Oldest Fossil Squirrel Protosciurus Rodentia Sciuridae
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Author : Robert John Emry
language : en
Publisher:
Release Date : 1982
Descriptive And Comparative Osteology Of The Oldest Fossil Squirrel Protosciurus Rodentia Sciuridae written by Robert John Emry and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with categories.
Descriptive And Comparative Osteology Of The Oldest Fossil Squirrel Protosciurus Rodentia
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Author : Robert J. Emry
language : de
Publisher:
Release Date : 1982
Descriptive And Comparative Osteology Of The Oldest Fossil Squirrel Protosciurus Rodentia written by Robert J. Emry and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 with categories.
Evolution Of The Rodents
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Author : Philip G. Cox
language : en
Publisher: Cambridge University Press
Release Date : 2015-08-06
Evolution Of The Rodents written by Philip G. Cox and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-08-06 with Science categories.
A valuable resource for the latest research on rodents, highlighting links across palaeontology, developmental biology, functional morphology, phylogenetics and biomechanics.
Squirrels
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Author : Richard W. Thorington Jr.
language : en
Publisher: JHU Press
Release Date : 2006-08-28
Squirrels written by Richard W. Thorington Jr. and has been published by JHU Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-08-28 with Science categories.
Did you know that a groundhog is really a type of squirrel? That squirrels control their body temperature with their tails? That most squirrels have yellow-tinted eye lenses that work like sunglasses to reduce glare? That tree squirrels can turn their hind feet completely around when climbing down a tree head-first? In Squirrels: The Animal Answer Guide, Richard W. Thorington Jr. and Katie Ferrell unveil the fascinating world of one of the "most watched" mammals on the planet. The diversity of squirrels is astounding. There are 278 species that inhabit all continents except Antarctica and Australia—varying in size from the lumbering 18-pound gray marmot to the graceful pygmy flying squirrel that is smaller than most mice. In many parts of the world they readily share human habitats, joining us for lunch in a city park, raiding our bird feeders, and sneaking into college dorm rooms through open windows. Reviled as pests or loved as an endearing amusement, squirrels have played important roles in trade, literature, and mythology. Thorington and Ferrell cover every aspect of this diverse animal family, from the first squirrels of 36 million years ago to the present day. With over one hundred photographs and an intuitive question-and-answer format, this authoritative and engaging guide sheds light on a common mammal that is anything but commonplace.
Evolutionary Relationships Among Rodents
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Author : W. Patrick Luckett
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-11-11
Evolutionary Relationships Among Rodents written by W. Patrick Luckett and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-11-11 with Science categories.
The order Rodentia is the most abundant and successful group of mammals, and it has been a focal point of attention for compar ative and evolutionary biologists for many years. In addition, rodents are the most commonly used experimental mammals for bio medical research, and they have played a central role in investi gations of the genetic and molecular mechanisms of speciation in mammals. During recent decades, a tremendous amount of new data from various aspects of the biology of living and fossil rodents has been accumulated by specialists from different disciplines, ranging from molecular biology to paleontology. Paradoxically, our understanding of the possible evolutionary relationships among different rodent families, as well as the possible affinities of rodents with other eutherian mammals, has not kept pace with this information "explosion. " This abundance of new biological data has not been incorporated into a broad synthesis of rodent phylo geny, in part because of the difficulty for any single student of rodent evolution to evaluate the phylogenetic significance of new findings from such diverse disciplines as paleontology, embryology, comparative anatomy, molecular biology, and cytogenetics. The origin and subsequent radiation of the order Rodentia were based primarily on the acquisition of a key character complex: specializations of the incisors, cheek teeth, and associated mus culoskeletal features of the jaws and skull for gnawing and chewing.
Descriptive And Comparative Osteology Of The Oldest Fossil Squirrel Protosciurus Sciuridae Rodentia
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Author : Robert J. Emry
language : en
Publisher:
Release Date : 1981
Descriptive And Comparative Osteology Of The Oldest Fossil Squirrel Protosciurus Sciuridae Rodentia written by Robert J. Emry and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Protosciurus categories.
The Tertiary Record Of Rodents In North America
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Author : William W. Korth
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-11-21
The Tertiary Record Of Rodents In North America written by William W. Korth and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-11-21 with Science categories.
Nearly half of the known species of mammals alive today (more than 1600) are rodents or "gnawing mammals" (Nowak and Paradiso, 1983). The diversity of rodents is greater than that of any other order of mammals. Thus, it is not surprising that the fossil record of this order is extensive and fossil material of rodents from the Tertiary is known from all continents except Antarctica and Australia. The purpose of this book is to compile the published knowledge on fossil rodents from North America and present it in a way that is accessible to paleontologists and mammalogists interested in evolutionary studies of ro dents. The literature on fossil rodents is widely scattered between journals on paleontology and mammalogy and in-house publications of museums and universities. Currently, there is no single source that offers ready access to the literature on a specific family of rodents and its fossil history. This work is presented as a reference text that can be useful to specialists in rodents (fossil or recent) as weIl as mammalian paleontologists working on whole faunas. Because the diversity of rodents in the world is essentially limitless, any monograph that included all fossil rodents would similarly be limitless. Hence, this book is limited to the re cord of Tertiary rodents of North America. The several species of South American (caviomorph) rodents that invaded North America near the end of the Tertiary are also not included in this text.
The White River Badlands
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Author : Rachel C. Benton
language : en
Publisher: Indiana University Press
Release Date : 2015-05-25
The White River Badlands written by Rachel C. Benton and has been published by Indiana University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-05-25 with Science categories.
This guide to the South Dakota region that houses the world’s richest fossil beds does “an excellent job of presenting the current state of knowledge” (Choice). The forbidding Big Badlands in Western South Dakota contain the richest fossil beds in the world. Even today these rocks continue to yield new specimens brought to light by snowmelt and rain washing away soft rock deposited on a floodplain long ago. The quality and quantity of the fossils are superb: most of the species to be found there are known from hundreds of specimens. The fossils in the White River Group (and similar deposits in the American west) preserve the entire late Eocene through the middle Oligocene, roughly 35-30 million years ago and more than thirty million years after non-avian dinosaurs became extinct. The fossils provide a detailed record of a period of abrupt global cooling and what happened to creatures who lived through it. This book is a comprehensive reference to the sediments and fossils of the Big Badlands, and also touches on National Park Service management policies that help protect such significant fossils. Includes photos and illustrations “A worthy successor to the work of O’Harra.” —Journal of Vertebrate Paleontology