| Prehistoric Life: Trilobite, Arkarua, Pteridinium, Dickinsonia, Prototaxites, Ornatifilum, Charnia, Yorgia, Aspidella, Isomer, Ovatoscut Contributor(s): Source Wikipedia (Author), Books, LLC (Editor), Books, LLC (Created by) |
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ISBN: 1157041523 ISBN-13: 9781157041528 Publisher: Books LLC, Wiki Series OUR PRICE: $16.63 Product Type: Paperback Published: October 2012 * Not available - Not in print at this time * |
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| Physical Information: 0.06" H x 7.44" W x 9.69" (0.16 lbs) 30 pages |
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| Publisher Description: Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 28. Chapters: Trilobite, Arkarua, Pteridinium, Dickinsonia, Prototaxites, Ornatifilum, Charnia, Yorgia, Aspidella, Isomer, Ovatoscutum, Ediacaria, Ernietta, Parvancorina, Ausia, Spongiophyton, Vendia, Hiemalora, Cyclomedusa, Fusulinid, Treptichnus pedum, Swartpuntia, Rangea, Francevillian Group Fossil, Rangeomorph, Charniodiscus, Nummulite, Horodyskia, Nimbia, Mawsonites, Albumares brunsae, Anfesta stankovskii, Grypania, Chondroplon, Praecambridium, Receptaculites, Elphidium, Collenia, Skania, Dickinsoniidae, Parafusulina, Yarnemia, Combresomyces, Coleolid, Paraschwagerina. Excerpt: Trilobites (; meaning "three lobes") are a well-known fossil group of extinct marine arthropods that form the class Trilobita. The first appearance of trilobites in the fossil record defines the base of the Atdabanian stage of the Early Cambrian period (), and they flourished throughout the lower Paleozoic era before beginning a drawn-out decline to extinction when, during the Devonian, almost all trilobite orders, with the sole exception of Proetida, died out. Trilobites finally disappeared in the mass extinction at the end of the Permian about . The trilobites were among the most successful of all early animals, roaming the oceans for over 270 million years. When trilobites first appeared in the fossil record they were already highly diverse and geographically dispersed. Because trilobites had wide diversity and an easily fossilized exoskeleton an extensive fossil record was left, with some 17,000 known species spanning Paleozoic time. The study of these fossils has facilitated important contributions to biostratigraphy, paleontology, evolutionary biology and plate tectonics. Trilobites are often placed within the arthropod subphylum Schizoramia within the superclass Arachnomorpha (equivalent to the Arachnata), although several alternative... |
