Descriptive and Comparative Osteology of the Oldest Fossil Squirrel Protosciurus (Rodentia:Sciuridae) PDF Download
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Author: Robert J. Emry
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 44
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Book Description
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.
Author: Robert J. Emry
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 44
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Book Description
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.
Author: José R. Castelló
Publisher: Princeton University Press
ISBN: 069117685X
Category : Nature
Languages : en
Pages : 331
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Book Description
The most complete and user-friendly photographic field guide to the world’s canids This stunningly illustrated and easy-to-use field guide covers every species of the world’s canids, from the Gray Wolf of North America to the dholes of Asia, from African jackals to the South American Bush Dog. It features more than 150 superb color plates depicting every kind of canid and detailed facing-page species accounts that describe key identification features, morphology, distribution, subspeciation, habitat, and conservation status in the wild. The book also includes distribution maps and tips on where to observe each species, making Canids of the World the most comprehensive and user-friendly guide to these intriguing and spectacular mammals. Covers every species and subspecies of canid Features more than 150 color plates with more than 600 photos from around the globe Depicts species in similar poses for quick and easy comparisons Describes key identification features, habitat, behavior, reproduction, and much more Draws on the latest taxonomic research Includes distribution maps and tips on where to observe each species The ideal field companion and a delight for armchair naturalists
Author:
Publisher:
ISBN:
Category : Paleontology
Languages : en
Pages : 670
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Book Description
Author: Eric J. Sargis
Publisher: Springer Science & Business Media
ISBN: 1402069979
Category : Science
Languages : en
Pages : 453
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Book Description
This book celebrates the contributions of Dr. Frederick S. Szalay to the field of Mammalian Evolutionary Morphology. Professor Szalay is a strong advocate for biologically and evolutionarily meaningful character analysis. He has published about 200 articles, six monographs, and six books on this subject. This book features subjects such as the evolution and adaptation of mammals and provides up-to-date articles on the evolutionary morphology of a wide range of mammalian groups.
Author: Akbar Zubaid
Publisher: Oxford University Press
ISBN: 0198035241
Category : Science
Languages : en
Pages : 359
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Book Description
Every three years a major international conference on bats draws the leading workers in the field to a carefully orchestrated presentation of the research and advances and current state of understanding of bat biology. Bats are the second most populous group of mammalia species, after rodents, and they are probably the most intensively studied group of mammals. Virtually all mammologists and a large proportion of organismic biologists are interested in bats. The earlier two edited books deriving from previous bat research conferences, as well as this one, have been rigorously edited by Tom Kunz and others, with all chapters subjected to peer review. The resulting volumes, published first by Academic Press and most recently by Smithsonian, have sold widely as the definitive synthetic treatments of current scientific understanding of bats.
Author: Lynette A. Jones
Publisher: Oxford University Press
ISBN: 0195173155
Category : Medical
Languages : en
Pages : 279
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Book Description
Surveying normal hand function in health individuals, this book presents a conceptual framework for analysing what is known about it. It organises human-hand research on a continuum that ranges from activities that are sensory to those with a strong motor component. It is useful for researchers in neuroscience, cognitive science, and gerontology.
Author: Eugene S. Morton
Publisher: Cambridge University Press
ISBN: 1107052254
Category : Medical
Languages : en
Pages : 263
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Book Description
This volume presents a new approach to conceptualizing animal vocal communication, with an emphasis on how receivers' responses influence signalling.
Author: Eliot Goldfinger
Publisher: OUP USA
ISBN: 0195142144
Category : Art
Languages : en
Pages : 257
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Book Description
From horses and cats to elephants and giraffes, this is the definitive reference on animal anatomy for painters, sculptors, and illustrators. 104 halftones, 281 line drawings, 100 photos.
Author: Winfried Henke
Publisher: Springer Science & Business Media
ISBN: 3540324747
Category : Science
Languages : en
Pages : 2057
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Book Description
This 3-volume handbook brings together contributions by the world ́s leading specialists that reflect the broad spectrum of modern palaeoanthropology, thus presenting an indispensable resource for professionals and students alike. Vol. 1 reviews principles, methods, and approaches, recounting recent advances and state-of-the-art knowledge in phylogenetic analysis, palaeoecology and evolutionary theory and philosophy. Vol. 2 examines primate origins, evolution, behaviour, and adaptive variety, emphasizing integration of fossil data with contemporary knowledge of the behaviour and ecology of living primates in natural environments. Vol. 3 deals with fossil and molecular evidence for the evolution of Homo sapiens and its fossil relatives.
Author: Gregory I. Bain
Publisher: Springer
ISBN: 3662457199
Category : Medical
Languages : en
Pages : 410
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Book Description
This cutting-edge monograph on advanced clinical anatomy and pathoanatomy of the shoulder, written by the world’s leading authors, reflects recent significant advances in understanding of anatomy and pathology. It is beautifully illustrated with exquisite photographs of anatomical specimens, and images from arthroscopy, histology, and radiology complete the picture. The accompanying text brings out the clinical, biomechanical, and functional relevance and focuses on aspects important to the high-performance athlete. In addition, the book closely assesses how each component of the normal anatomy responds to trauma, disease, and degeneration. The finer points of the pathoanatomy are demonstrated with clinical cases, histology, radiology, arthroscopy, and open surgery. The text details how the pathoanatomy affects the patient presentation, clinical examination, and imaging. It is also explained how the pathology affects the natural history and the outcome of physical therapy and influences recommendations for surgical treatments. This book will be of immense value both to trainees and to specialists who manage disorders of the shoulder, including orthopedic surgeons, sports physicians, and physiotherapists. It will also be of great interest to anatomists and pathologists.
