Cephalopods Present and Past: New Insights and Fresh PerspectivesNeil H. Landman, Richard Arnold Davis, Royal H. Mapes Cephalopods are diverse, highly developed molluscs capable of swimming and jet propulsion. These animals are an important component of present-day marine ecos- tems throughout the world and comprise approximately 900 species. They also have an extraordinary fossil record, extending back to the Cambrian Period, with as many as 10,000 extinct species. Throughout their long history, they have experienced sp- tacular radiations and near-total extinctions. Because of their superb fossil record, they also serve as ideal index fossils to subdivide geologic time. This book touches on many of these themes, and it treats both fossil and present-day cephalopods. The chapters are outgrowths of presentations at the Sixth International Symposium “Cephalopods – Present and Past,” at the University of Arkansas in Fayetteville, September 16–19, 2004. The Symposium was organized principally by Walter L. Manger of the Department of Geology, University of Arkansas. The editors gratefully acknowledge Walter for his terrific job in putting together this symposium and for making it such an intellectual, and social, success. Other publications related to this Symposium include the abstract volume, assembled by W. L. Manger, and two fie- trip guidebooks, one written by W. L. Manger, and the other by R. H. Mapes. Because this symposium was held in North America, it honored four cephalopod workers from this continent: William A. Cobban (US Geological Survey, Denver, Colorado), Brian F. Glenister (University of Iowa, Iowa City, Iowa), William M. Furnish (University of Iowa, Iowa City, Iowa), and Gerd E. G. |
Contents
Patterns of Embryonic Development | 17 |
Material and Methods | 19 |
Discussion | 30 |
Conclusions | 35 |
Acknowledgments | 36 |
References | 53 |
Conch Form Analysis Variability Morphological | 59 |
Material | 60 |
Discussion | 245 |
Conclusions | 252 |
Previous Work | 258 |
Description of Jaws | 264 |
Discussion | 288 |
Discussion | 289 |
Acknowledgments | 294 |
Introduction | 299 |
Comparisons with Other Samples of Manticoceras | 69 |
Emily G Allen Fachrichtung Paläontologie | 74 |
Orientation of the Aperture in Manticoceras | 77 |
GONIAT The Current State of the Paleontological Database | 86 |
Problems and Limitations | 92 |
Ornamental Polymorphism in Placenticeras kaffrarium | 99 |
Evolutionary Mechanisms of Polymorphism in Placenticeras | 107 |
Acknowledgments | 117 |
Comparative Morphology | 124 |
Systematic Paleontology | 135 |
Department of Palaeozoology Malteserstrasse 74100 | 140 |
On the Species Status of Spirula spirula Linné 1758 | 144 |
Results | 150 |
Introduction | 153 |
New Insight into | 157 |
The basic structure of the ammonitella or embryonic shell of the Ammonoidea has been | 168 |
Results 168 5 Discussion 172 6 Summary | 177 |
Methods | 188 |
Discussion | 195 |
Acknowledgments | 202 |
Paläontologisches Institut | 205 |
Softtissue Attachment Structures 208 5 Conclusions | 217 |
Locality and Material | 223 |
Conclusions | 236 |
Swedish Museum of Natural History D12249 Berlin Germany | 239 |
Previous Studies | 300 |
Discussion | 309 |
317 | |
Chapter 15 | 319 |
3 | 327 |
Changes in Diversity | 330 |
Conclusions | 338 |
The seminal discovery by Meek and Hayden 1865 of an aptychus preserved | 342 |
Deformities in the Late Callovian Late Middle Jurassic | 344 |
Terminology 351 5 Epizoa | 353 |
Healed Shell Fractures | 362 |
Distorted Shapes of Unknown Origin | 368 |
Biogeography of Kutch Ammonites During the Latest Jurassic | 375 |
Affinity of Kutch Assemblage | 382 |
References | 392 |
Description of Ammonite Touch Marks | 402 |
Conclusions | 418 |
Some Data on the Distribution and Biology of the Boreal | 423 |
Conclusions | 431 |
Methods | 437 |
Discussion | 449 |
455 | |
476 | |
Other editions - View all
Cephalopods Present and Past: New Insights and Fresh Perspectives Neil H. Landman,Richard Arnold Davis,Royal H. Mapes No preview available - 2008 |
Cephalopods Present and Past: New Insights and Fresh Perspectives Neil H. Landman,Richard Arnold Davis,Royal H. Mapes No preview available - 2007 |
Common terms and phrases
adult ammonite ammonitella ammonoids AMNH analysis aperture appear aptychi attachment Baculites body chamber Bogoslovsky Carboniferous cephalopods changes cladistic coleoids complex conch connecting continued Cretaceous described detail Devonian diameter distance distribution Doguzhaeva dorsal early editors embryonic et al evolution evolutionary extinction Formation forms fossil genera Geological given increase indicates internal kaffrarium Kennedy Late lateral layer length lines Lirae space lower Manticoceras mantle margin marks material measured membranes Middle midflank morphology Mutvei N. H. Landman Nautilus observed occur organic originally ornament Paleobiology Paleozoic pattern phragmocone phylogenetic position present preserved Press pseudosutures radula Ratio References Region reported represent rostrum Scale bar Sciences Shale shape shell side similar siphuncular membranes smooth soft species specimens stage structure surface suture Tanabe taxa tissues ultrastructure University Upper ventral western whorl width York Zone
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