The Generation And Maintenance Of Morphologic And Phylogenetic Diversity Among Early Paleozoic Gastropods
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The Generation And Maintenance Of Morphologic And Phylogenetic Diversity Among Early Paleozoic Gastropods
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Author : Peter J. Wagner
language : en
Publisher:
Release Date : 1995
The Generation And Maintenance Of Morphologic And Phylogenetic Diversity Among Early Paleozoic Gastropods written by Peter J. Wagner and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Gastropoda, Fossil categories.
Phylogenetic Relationships Of The Earliest Anisostrophically Coiled Gastropods
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Author : Peter J. Wagner
language : en
Publisher:
Release Date : 2002
Phylogenetic Relationships Of The Earliest Anisostrophically Coiled Gastropods written by Peter J. Wagner and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Gastropoda, Fossil categories.
In order to explore the phylogenetic relationships among early gastropods, cladistic analyses were conducted of nearly 300 archaeogastropod species known from the latest Cambrian through the Silurian. The study includes an extended outgroup analysis of Cambrian molluscs. The resulting estimates of gastropod phylogeny differ not only from traditional ideas about early gastropod relationships, but also from most alternative notions. Outgroup analyses suggest that gastropods had ancestors among the Tergomya (= Monoplacophora of many workers) of the Middle or Late Cambrian. Putative gastropods from older strata (e.g., the Pelagiellida and early Onychochilidae) apparently are not closely related to gastropods. The hypothesized ancestor of gastropods possessed dextral-coiling, septation, a deep sinus, and a peripheral band. An anal slit is commonly described as a synapomorphy of gastropods that many clades subsequently lost; however, this study suggests that the slit is a rare, highly derived, and polyphyletic character among early Paleozoic species, and that the ancestors of most "advanced" clades (e.g., the Apogastropoda) never had slits.This study suggests that two major subclades evolved by the earliest Ordovician. The diagnoses and definitions of these two subclades best correspond to the traditional diagnoses and definitions of the Euomphalina and Murchisoniina. The Pleurotomarioidea is not a paraphyletic ancestral taxon as typically suggested, but instead it is a polyphyletic assemblage derived multiple times from "euomphalinae" and "murchisoniinae" species. The Bellerophontina is at least diphyletic, as the taxon includes both the ancestors of archaeogastropods and a clade of planispiral species that is secondarily derived from "archaeogastropods." Macluritoids sensu stricto represent a restricted subclade of the "euomphalinae"; other supposed macluritoids evolved among different euomphalinae subclades or are not gastropods. Early Paleozoic species previously classified as caenogastropods (i.e., the Loxonematoidea and Subulitoidea) represent separate murchisoniinae subclades, with some putative members of the Subulitoidea derived within the Loxonematoidea. Early Paleozoic species assigned to the Trochoidea also represent several subclades, with most of those clades having evolved from the euomphalinae.An extensive taxonomic revision is presented, which removes all early Paleozoic taxa from the Pleurotomariina and broadly expands the definitions of the Euomphalina and Murchisoniina.
Smithsonian Contributions To Paleobiology
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Author :
language : en
Publisher:
Release Date : 1998
Smithsonian Contributions To Paleobiology written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Paleobiology categories.
Dissertation Abstracts International
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Author :
language : en
Publisher:
Release Date : 1996
Dissertation Abstracts International written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Dissertations, Academic categories.
American Doctoral Dissertations
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Author :
language : en
Publisher:
Release Date : 1995
American Doctoral Dissertations written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Dissertation abstracts categories.
Phylogeny And Evolution Of The Mollusca
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Author : Winston Ponder
language : en
Publisher: Univ of California Press
Release Date : 2008-03-25
Phylogeny And Evolution Of The Mollusca written by Winston Ponder and has been published by Univ of California Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-03-25 with Nature categories.
"Ponder and Lindberg provides a breathtaking overview of the evolutionary history of the Mollusca, effectively melding information from anatomy, ecology, genomics, and paleobiology to explore the depths of molluscan phylogeny. Its outstanding success is due to thoughtful planning, focused complementary contributions from 36 expert authors, and careful editing. This volume is a must for malacologists."—Bruce Runnegar, Department of Earth and Space Sciences, University of California, Los Angeles "Our understanding of the phylogeny and evolutionary history of the mollusca has been revolutionized over the past two decades through new molecular data and analysis, and reinvestigation of morphological characters. In this volume Ponder, Lindberg, and their colleagues do a wonderful job of integrating this work to provide new perspectives on the relationships of the major molluscan clades, their evolutionary dynamics, and their history. Particularly timely is the coverage of molluscan evo-devo and genomics."—Douglas H. Erwin, Curator of Paleozoic Invertebrates, National Museum of Natural History
Patterns And Processes In The History Of Life
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Author : D.M. Raup
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Patterns And Processes In The History Of Life written by D.M. Raup 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 2012-12-06 with Medical categories.
Hypothesis testing is not a straightforward matter in the fossil record and here, too interactions with biology can be extremely profitable. Quite simply, predictions regarding long-term consequences of processes observed in liv ing organisms can be tested directly using paleontological data if those liv ing organisms have an adequate fossil record, thus avoiding the pitfalls of extrapolative approaches. We hope to see a burgeoning of this interactive effort in the coming years. Framing and testing of hypotheses in paleon tological subjects inevitably raises the problem of inferring process from pattern, and the consideration and elimination of a broad range of rival hy is an essential procedure here. In a historical science such as potheses paleontology, the problem often arises that the events that are of most in terest are unique in the history of life. For example, replication of the metazoan radiation at the beginning of the Cambrian is not feasible. How ever, decomposition of such problems into component hypotheses may at least in part alleviate this difficulty. For example, hypotheses built upon the role of species packing might be tested by comparing evolutionary dy namics (both morphological and taxonomic) during another global diversi fication, such as the biotic rebound from the end-Permian extinction, which removed perhaps 95% of the marine species (see Valentine, this volume). The subject of extinction, and mass extinction in particular, has become important in both paleobiology and biology.
The Great Ordovician Biodiversification Event
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Author : Barry D. Webby
language : en
Publisher: Columbia University Press
Release Date : 2004-04-14
The Great Ordovician Biodiversification Event written by Barry D. Webby and has been published by Columbia University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004-04-14 with Science categories.
Two of the greatest evolutionary events in the history of life on Earth occurred during Early Paleozoic time. The first was the Cambrian explosion of skeletonized marine animals about 540 million years ago. The second was the "Great Ordovician Biodiversification Event," which is the focus of this book. During the 46-million-year Ordovician Period (489–443 m.y.), a bewildering array of adaptive radiations of "Paleozoic- and Modern-type" biotas appeared in marine habitats, the first animals (arthropods) walked on land, and the first non-vascular bryophyte-like plants (based on their cryptospore record) colonized terrestrial areas with damp environments. This book represents a compilation by a large team of Ordovician specialists from around the world, who have enthusiastically cooperated to produce this first globally orientated, internationally sponsored IGCP (International Geological Correlation Program) project on Ordovician biotas. The major part is an assembly of genus- and species-level diversity data for the many Ordovician fossil groups. The book also presents an evaluation of how each group diversified through Ordovician time, with assessments of patterns of change and rates of origination and extinction. As such, it will become the standard work and data source for biotic studies on the Ordovician Period.
Catalogue And Bibliography Of The Marine Shell Bearing Mollusca Of Japan
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Author : Shun'ichi Higo
language : en
Publisher:
Release Date : 2001
Catalogue And Bibliography Of The Marine Shell Bearing Mollusca Of Japan written by Shun'ichi Higo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Mollusks categories.
Freshwater Animal Diversity Assessment
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Author : E.V. Balian
language : en
Publisher: Springer Science & Business Media
Release Date : 2008-04-27
Freshwater Animal Diversity Assessment written by E.V. Balian 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 2008-04-27 with Science categories.
This book offers a comprehensive study of species- and genus-level diversity and chorology of the global freshwater fauna to date. It gives a state of the art assessment of the diversity and distribution of Metazoa in the continental waters of the world.