Phylogenetic Analysis Of Early Paleozoic Gastropods
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Phylogenetic Analysis Of Early Paleozoic Gastropods
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Author : Donna Marie DeCarlo
language : en
Publisher:
Release Date : 1993
Phylogenetic Analysis Of Early Paleozoic Gastropods written by Donna Marie DeCarlo and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with 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.
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.
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
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
Paleozoic Gastropod Genotypes
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Author : J. Brookes Knight
language : en
Publisher: Geological Society of America
Release Date : 1941
Paleozoic Gastropod Genotypes written by J. Brookes Knight and has been published by Geological Society of America this book supported file pdf, txt, epub, kindle and other format this book has been release on 1941 with Science categories.
Phylogenetics Development And Cenozoic Paleontology Of Buccinidae Mollusca
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Author : Jann Elizabeth Vendetti
language : en
Publisher:
Release Date : 2009
Phylogenetics Development And Cenozoic Paleontology Of Buccinidae Mollusca written by Jann Elizabeth Vendetti and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
The buccinid gastropods (family Buccinidae) are a species-rich clade of mostly North Pacific taxa with an abundant fossil record that dates to the Cretaceous. Here, the evolution, systematics, and biology of fossil and extant members of this family are treated using a variety of analytical and methodological approaches. In chapter one, a new fossil species of Bruclarkia, an endemic eastern Pacific buccinid from the Eocene, Oligocene, and Miocene, is described from the Astoria Formation of the Pacific Northwest. This species, B. ellenae, was discovered among fossil material of the University of California Museum of Paleontology and California Academy of Science and had been either overlooked or identified incorrectly in previous reviews of Astoria fauna. Its novel morphology was characterized based on 11 shell traits and was compared to all other Bruclarkia species in a sample size of nearly 800 individuals. The challenges inherent to correlating Pacific Northwest and California Miocene sequences are also discussed. In chapter two, all proposed Bruclarkia taxa are reviewed and re-described based on morphological characters determined from the largest examination of the genus to date. Intraspecific variation as well as autapomorphies and synapomorphies are characterized from hundreds of fossils that were measured and scored. Results suggest that of the twenty proposed Bruclarkia taxa, only seven are valid. The majority of remaining species are found to be either synonymous with valid taxa or named from type material that is insufficient for suitable description. The value of Bruclarkia acuminata, B. barkeriana, and B. gravida, as index fossils is emphasized and the paleobiogeography of these and other Bruclarkia lineages throughout California, Oregon, Washington, Vanouver Island, Canada, and Alaska is presented. In chapter three, the molecular phylogenetic systematics of 43 buccinid taxa mostly from Japanese waters is presented. Phylograms are based on Bayesian and maximum likelihood analyses of approximately 1500 base pairs from the mitochondrial gene CO1 and 625 from the nuclear gene 28S. These data suggest that: (1) Buccinidae is monophyletic, though the placement of several genera (e.g. Lirabuccinuum, Microfusus, and Solenosteira) is poorly supported, (2) the genera Busycon and Busycotypus, which have often been classified in the family Melongenidae, belong within Buccinidae, (3) the subfamilies Beringiinae, Buccininae, Busyconinae, Neptuneinae, and Photinae are monophyletic, and (4) the genera Neptunea, Buccinum, and Busycon are also monophyletic. General characters of larval development in selected buccinids are presented in a cladistic framework, which reveals two species (Kelletia kelletii and Volutharpa perryi) from different subfamilies that both have planktonic larvae. In chapter four, the early development of the California buccinid Kelletia kelletii is reviewed with new observations of larval asymmetries and feeding ability during incapsulation and after hatching. Larval shells and veligers were visualized under optical microscopy and SEM to observe fine-scale morphology at various ontogenetic stages. These observations reveal that: (1) intracapular veligers are capable of particle capture and transport but not ingestion, (2) hatching time varies between approximately 35 to 60 days depending on water conditions and temperature, (3) intracapsular larvae do not eat undeveloped eggs and/or embryos though they are present in all capsules, (4), pre-hatched veligers swim in the plankton if excapsulated at 27 days old and older, (5) within the capsule, veliger velar lobes are symmetrical but the right cephalic tentacles is larger than the left, (6) at 2.5 weeks in the plankton, both the right cephalic tentacle and right velar lobe are larger than those on the left, and (7) larval shells are brittle at emergence but calcify and grow apertural beaks and proto-siphonal canals by 2.5 weeks in the plankton. Finally, in chapter five, a new method for replicating gastropod protoconchs (larval shells) is presented. It is based on protocols used in vertebrate paleontology for molding and casting micro-mammal and other small vertebrate teeth. Molding requires clean and periostracum-free shell apexes to be covered with a dental-grade polyvinylsiloxane impression material. Casts are made from molds using tinted epoxy resin and can be re-cast multiple times from the same mold without deterioration in cast quality. The practical applications of this technique to gastropods are substantial because for many snails, the protoconch indicates larval developmental mode as either planktonic or non-planktonic. Resulting casts can be examined in small SEM machines that could not accommodate the full gastropod shell, and can be made from specimens that would be otherwise be prohibited from such studies (e.g. living specimens, shells from protected land or private collections, type specimens, etc.). Together these chapters tell the story of North Pacific buccinid evolution, speciation, and migration in selected fossil and extant lineages, early ontogeny in an unusual east Pacific buccinid, and practical methods for using protoconchs to answer questions about development in extant and extinct taxa. Future directions for research include expanding the sample size of buccinid taxa and the number of loci in molecular phylogenetic analyses, examining the shell characters and protoconchs of Bruclarkia taxa and their modern analogues to infer developmental mode and life history characteristics, and applying protoconchs replication methods (and subsequent analyses) to gastropods from diverse families- fossil and extant.
Phylogenetic Analysis Of The Lophospiridae Gastropoda Pleurotomariina Of The Ordovician And Silurian
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Author : Peter J. Wagner
language : en
Publisher:
Release Date : 1990
Phylogenetic Analysis Of The Lophospiridae Gastropoda Pleurotomariina Of The Ordovician And Silurian 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 1990 with Gastropoda, Fossil categories.
Masters Theses In The Pure And Applied Sciences
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Author : Wade H. Shafer
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Masters Theses In The Pure And Applied Sciences written by Wade H. Shafer 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 Science categories.
Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS)* at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dis semination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volumes were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 38 (thesis year 1993) a total of 13,787 thesis titles from 22 Canadian and 164 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this impor tant annual reference work. While Volume 38 reports theses submitted in 1993, on occasion, certain uni versities do report theses submitted in previous years but not reported at the time.
Stratigraphy Structure And Early Paleozoic Gastropoda Of The Callahan Area Klamath Mountains California
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Author : David Malcolm Rohr
language : en
Publisher:
Release Date : 1978
Stratigraphy Structure And Early Paleozoic Gastropoda Of The Callahan Area Klamath Mountains California written by David Malcolm Rohr and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with Gastropoda, Fossil categories.