Download or read book Evolution and Ontogeny of Hadrosaurs Dinosauria Ornithischia in the Judith River Formation late Cretaceous Campanian of Northcentral Montana written by Elizabeth Anne Freedman and published by . This book was released on 2015 with total page 477 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hadrosaurs, the "duck-billed" dinosaurs, were abundant members of Campanian (Late Cretaceous) communities in the Western Interior of North America, and are thus an ideal group for studying high-resolution evolutionary trends. This dissertation describes two new hadrosaurine taxa from the Judith River Formation exposed in Kennedy Coulee, northcentral Montana. The localities are stratigraphically equivalent to Unit 1 of the Oldman Formation, a time interval with no previously described hadrosaurine species. Phylogenetic and geometric morphometric analyses, combined with recalibrated radiometric dates, demonstrate that the new taxa form morphologic and stratigraphic intermediates within the lineages of Gryposaurus and Acristavus-Brachylophosaurus. The new genus of brachylophosaurin has a short posteriorly-oriented nasal crest hypothesized as an intermediate evolutionary state between the stratigraphically lower crestless Acristavus (lower Two Medicine Formation) and the stratigraphically higher Brachylophosaurus (middle Oldman Formation), with its wide posteriorly elongated crest. The nasal crest of Brachylophosaurus elongates posteriorly ontogenetically (as the individual grows). Histologic analysis demonstrates that the holotype of the new genus is relatively more mature than the largest Brachylophosaurus specimen, so its smaller crest size is not due to the ontogenetic status of the holotype. The new species of Gryposaurus is from a monodominant bonebed of at least ten individuals and three size classes: juvenile, subadult, and adult. The taphonomy of the bonebed is interpreted as a mass death assemblage deposited along a lake margin. The abundant postcranial bones are illustrated in a photographic atlas. In the new Gryposaurus species, the shape and position of the nasal crest is morphologically intermediate between the stratigraphically lower G. latidens (lower Two Medicine Formation) and the stratigraphically higher G. notabilis (lower Dinosaur Park Formation). In G. latidens, the nasal crest is low and anterodorsal to the posterior narial fenestra. The nasal crest becomes progressively higher and more posteriorly located in stratigraphically younger species. A similar trend occurs ontogenetically within specimens of the same species. Thus, in Gryposaurus and Acristavus-Brachylophosaurus lineages, directional trends in nasal crest morphology are observed both through ontogeny and between stratigraphically separated non-overlapping taxa, suggesting that the new taxa may be transitional members of anagenetic evolutionary lineages.
Download or read book Fossil Record 5 written by Robert M. Sullivan and published by New Mexico Museum of Natural History and Science. This book was released on 2016-01-01 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hadrosaurs written by David A. Eberth and published by Indiana University Press. This book was released on 2014-11-05 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive study of the Late Cretaceous, duck-billed dinosaur, featuring insights on its origins, anatomy, and more. Hadrosaurs—also known as duck-billed dinosaurs—are abundant in the fossil record. With their unique complex jaws and teeth perfectly suited to shred and chew plants, they flourished on Earth in remarkable diversity during the Late Cretaceous. So ubiquitous are their remains that we have learned more about dinosaurian paleobiology and paleoecology from hadrosaurs than we have from any other group. In recent years, hadrosaurs have been in the spotlight. Researchers around the world have been studying new specimens and new taxa seeking to expand and clarify our knowledge of these marvelous beasts. This volume presents the results of an international symposium on hadrosaurs, sponsored by the Royal Tyrrell Museum and the Royal Ontario Museum, where scientists and students gathered to share their research and their passion for duck-billed dinosaurs. A uniquely comprehensive treatment of hadrosaurs, the book encompasses not only the well-known hadrosaurids proper, but also Hadrosaouroidea, allowing the former group to be evaluated in a broader perspective. The 36 chapters are divided into six sections—an overview, new insights into hadrosaur origins, hadrosaurid anatomy and variation, biogeography and biostratigraphy, function and growth, and preservation, tracks, and traces—followed by an afterword by Jack Horner. “Well designed, handsome and fantastically well edited (credit there to Patricia Ralrick), congratulations are deserved to the editors for pulling together a vast amount of content, and doing it well. The book contains a huge quantity of information on these dinosaurs.” —Darren Naish, co-author of Tetrapod Zoology, Scientific American “Hadrosaurs have not had the wide publicity of their flesh-eating cousins, the theropods, but this remarkable dinosaur group offers unique opportunities to explore aspects of palaeobiology such as growth and sexual dimorphism. In a comprehensive collection of papers, all the hadrosaur experts of the world present their latest work, exploring topics as diverse as taxonomy and stratigraphy, locomotion and skin colour.” —Michael Benton, University of Bristol
Download or read book A New Skull of Parasaurolophus Dinosauria Hadrosauridae from the Kirtland Formation of New Mexico and a Revision of the Genus written by Robert M. Sullivan and published by New Mexico Museum of Natural History and Science. This book was released on 1999 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ontogeny and Evolution of Lambeosaurine Dinosaurs Ornithischia written by David Christopher Evans and published by . This book was released on 2007 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lambeosaurinae is a Glade of hadrosaurid dinosaurs characterized by hypertrophied nasal passages housed within distinctive cranial crests. Large sample sizes, taxonomic diversity, and increasing resolution of their chronostratigraphic and paleoecological contexts make the group an ideal model Glade with which to test hypotheses related to Late Cretaceous dinosaur evolution. Anatomy and variation in the poorly known taxa Lambeosaurus magnicristalus and Hypacrosaurus altispinus are described in detail and both taxa are systematically revised. A complete digital endocranial cast derived from H. altispinus braincase reveals that the cerebral hemispheres are large and that the auditory system of lambeosaurines closely resembles those of other hadrosauroids. An abundance of juvenile specimens make lambeosaurines ideal subjects for comparative studies of growth and variation. The precise taxonomic identification of crestless juvenile specimens has proven difficult in the Dinosaur Park Formation (Campanian) of Alberta, Canada, where six closely related taxa are known. Discrete cranial characters are identified to distinguish lambeosaurine genera at early ontogenetic stages. Cranial ontogeny is compared among lambeosaurines with morphometric and qualitative approaches. Analyses of allometry confirm the general trends observed for Lambeosaurus and Corythosaurus in a larger subset of taxa that includes Hypacrosaurus. The first species-level phylogenetic analysis of Lambeosaurinae recovers completely resolved relationships within the Parasauolophini and Corythosaurim, and corroborates monophyly of the genera Lambeosaurus, Hypacrosaurus, and Parasaurolophus. The time-calibrated phylogeny and distribution of autapomoiphies allows for first order assessment of anagenesis in the clade. Previous hypotheses of anagenetic ancestor-descendant relationships can be rejected, although data does not reject the possibility that the biostratigraphic successions of Corythosaurus and Lambeosaurus species in the well-sampled Dinosaur Park Formation represent phyletic evolution within two independent, co-occuring dinosaur lineages. Hypotheses of sexual dimorphism in the cranial crests of Corythosaurus and Lambeosaurus are tested within a high-resolution biostratigraphic framework. Biostratigraphic succession of cranial morphotypes in both taxa is inconsistent with previously proposed sexual dimorphism, and, instead, indicates that the formation hosts a taxonomically diverse assemblage of lambeosaurines.
Download or read book Hadrosaurian Dinosaurs of North America written by Richard Swann Lull and published by Geological Society of America. This book was released on 1942 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hadrosaurus written by Leigh Rockwood and published by The Rosen Publishing Group, Inc. This book was released on 2011-08-15 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents general information about the hadrosaurus, including the period in which it lived, where its fossils have been found, its bodily structure, and how it probably behaved.
Download or read book Phylonyms written by Kevin de Queiroz and published by CRC Press. This book was released on 2020-04-30 with total page 1353 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phylonyms is an implementation of PhyloCode, which is a set of principles, rules, and recommendations governing phylogenetic nomenclature. Nearly 300 clades - lineages of organisms - are defined by reference to hypotheses of phylogenetic history rather than by taxonomic ranks and types. This volume will document the Real World uses of PhyloCode and will govern and apply to the names of clades, while species names will still be governed by traditional codes. Key Features Provides clear regulations for implementing new guidelines for naming lineages of organisms incorporates expressly evolutionary and phylogenetic principles Works with existing codes of nomenclature Eliminates the reliance on rank-based classification in favor of phylogenetic relationships Related Titles: Rieppel, O. Phylogenetic Systematics: Haeckel to Hennig (ISBN 978-1-4987-5488-0) Cantino, P. D. and de Queiroz, K. International Code of Phylogenetic Nomenclature (PhyloCode) (ISBN 978-1-138-33282-9).
Download or read book Through the End of the Cretaceous in the Type Locality of the Hell Creek Formation in Montana and Adjacent Areas written by Gregory P. Wilson and published by Geological Society of America. This book was released on 2014-01-21 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The chapters represent a surge of field and laboratory research activity, illustrating the impacts of new and refined methods and tools. This volume explores geologic and biologic history preserved in the strata bounding the Cretaceous-Paleogene boundary"--Provided by publisher.
Download or read book Dinosaurs and Other Reptiles from the Mesozoic of Mexico written by Héctor E. Rivera-Sylva and published by Indiana University Press. This book was released on 2014-04-15 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt: This overview of dinosaur discoveries in Mexico synthesizes current information about the geography and environment of the region during the Mesozoic when it was the western margin of the ancient continent of Pangea. The book summarizes research on various groups, including turtles, lepidosauromorphs, plesiosaurs, crocodyliforms, pterosaurs, and last but not least, dinosaurs. In addition, chapters focus on trackways and other trace fossils and on K/P boundary (the Chicxulub crater, beneath the Gulf of Mexico, has been hypothesized as the site of the boloid impact that killed off the dinosaurs). Dinosaurs and Other Reptiles from the Mesozoic of Mexico is an up-to-date, informative volume on an area that has not been comprehensively described until now.
Download or read book Dinosaur Systematics written by Kenneth Carpenter and published by Cambridge University Press. This book was released on 1992-07-31 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years dinosaurs have captured the attention of the public at an unprecedented scale. At the heart of this resurgence in popular interest is an increased level of research activity, much of which is innovative in the field of palaeontology. For instance, whereas earlier palaeontological studies emphasized basic morphologic description and taxonomic classification, modern studies attempt to examine the role and nature of dinosaurs as living animals. More than ever before, we understand how these extinct species functioned, behaved, interacted with each other and the environment, and evolved. Nevertheless, these studies rely on certain basic building blocks of knowledge, including facts about dinosaur anatomy and taxonomic relationships. One of the purposes of this volume is to unravel some of the problems surrounding dinosaur systematics and to increase our understanding of dinosaurs as a biological species. Dinosaur Systematics presents a current overview of dinosaur systematics using various examples to explore what is a species in a dinosaur, what separates genders in dinosaurs, what morphological changes occur with maturation of a species, and what morphological variations occur within a species.
Download or read book Dinosaur Provincial Park written by Philip J. Currie and published by Indiana University Press. This book was released on 2005 with total page 712 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This comprehensive history of a remarkable window into the history of the earth will be required reading for everyone interested in the life of the past."--BOOK JACKET.
Download or read book Osteology and Variation of Brachylophosaurus Canadensis Dinousauria Hadrosauridae from the Upper Cretaceous Judith River Formation of Montana written by Albert Prieto-Márquez and published by . This book was released on 2001 with total page 780 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Vertebrate Paleontology in Utah written by David D. Gillette and published by Utah Geological Survey. This book was released on 1999 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 52 papers in this vary in content from summaries or state-of-knowledge treatments, to detailed contributions that describe new species. Although the distinction is subtle, the title (Vertebrate Paleontology in Utah) indicates the science of paleontology in the state of Utah, rather than the even more ambitious intent if it were given the title “Vertebrate Paleontology of Utah” which would promise an encyclopedic treatment of the subject. The science of vertebrate paleontology in Utah is robust and intense. It has grown prodigiously in the past decade, and promises to continue to grow indefinitely. This research benefits everyone in the state, through Utah’s muse ums and educational institutions, which are the direct beneficiaries.
Download or read book The Beginning of the Age of Dinosaurs written by Kevin Padian and published by Cambridge University Press. This book was released on 1988-09-30 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt: Around 210 million years ago, life on Earth experienced sweeping changes. Many archaic reptiles and mammalian predecessors became extinct and were replaced by dinosaurs, pterosaurs, crocodiles, turtles, mammals, and essentially all of the major modern vertebrate groups except the birds. This period of change, which took place over a period of approximately five to ten million years, ushered in the beginning of the 'Age of Dinosaurs,' a period that lasted 160 million years to the end of the Cretaceous 65 million years ago. In the past decade, paleontologists have come to know a great deal more about this crucial interval of time. New discoveries, ideas, and insights from scientists in many related- disciplines have created new paradigms about the beginning of the 'Age of Dinosaurs.' What were the animals that preceded the dinosaurs like? How did the dinosaurs originate, and what do we know of their early history? Was their ascent tied to evolutionary innovations, global climatic and ecological changes, or just chance factors? How do paleontologists decide about the evidence preserved in the fossil record, and what areas now require major thought and reevaluation? In this book, 31 specialists in the paleontology of this era consider these and other questions related to Late Triassic and Early Jurassic times - the beginning of the 'Age of Dinosaurs,' its fauna, flora, climate, stratigraphic relationships, and major evolutionary changes. The book is divided into sections on background, Late Triassic taxa and faunas, changes across the boundary, Early Jurassic taxa and faunas, and major macroevolutionary patterns. This comprehensive volume is richly illustrated and is intended for students and professionals in the areas of paleontology, evolutionary biology, geology, and vertebrate zoology. Introductory and summary chapters are provided to acquaint the non-specialist with the issues and the setting of this interval of time in which the ancestral components of the modem fauna, as well as the Dinosauria, first appeared to rule the Earth.
Download or read book Dinosaur Eggs and Babies written by Kenneth Carpenter and published by Cambridge University Press. This book was released on 1996-01-26 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last two decades the study of dinosaur eggs and babies has proved a very profitable area of dinosaur research. This book is solely devoted to this topic and reviews our present state of knowledge in this area of paleontology.
Download or read book Bernissart Dinosaurs and Early Cretaceous Terrestrial Ecosystems written by Pascal Godefroit and published by Indiana University Press. This book was released on 2012-07-05 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt: In 1878, the first complete dinosaur skeleton was discovered in a coal mine in Bernissart, Belgium. Iguanodon, first described by Gideon Mantell on the basis of fragments discovered in England in 1824, was initially reconstructed as an iguana-like reptile or a heavily built, horned quadruped. However, the Bernissart skeleton changed all that. The animal was displayed in an upright posture similar to a kangaroo, and later with its tail off the ground like the dinosaur we know of today. Focusing on the Bernissant discoveries, this book presents the latest research on Iguanodon and other denizens of the Cretaceous ecosystems of Europe, Asia, and Africa. Pascal Godefroit and contributors consider the Bernissart locality itself and the new research programs that are underway there. The book also presents a systematic revision of Iguanodon; new material from Spain, Romania, China, and Kazakhstan; studies of other Early Cretaceous terrestrial ecosystems; and examinations of Cretaceous vertebrate faunas.
