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Excerpt from The Evolution of the Vertebrates and Their Kin
It is many years since a sustained attempt has been made to unite the various branches of the animal kingdom into a natural, coherent system, or genealogical tree, that would indicate the rise and decline of the important functions and organs, map out the highways of organic evolution, and assign in geological terms the approximate dates and surroundings for the critical events in structural in novation and readjustment that have marked its progress.
The most important problem involved in such an undertaking is to discover which one, if any, of the many existing invertebrate phyla forms the trunk line of descent from the lowest vertebrates to the coelenterates, and through them to the protozoa.
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Paperback. Zustand: New. Print on Demand. Through comparative analysis of fossil remains, embryology, morphology, and the evolution of arthropods, this book develops a compelling theory on the origin of vertebrates. Drawing on evidence from the arthropods and arachnid classes, the author traces the gradual transformation of metamers into a compact, organized head made up of specialized structures akin to those found in vertebrates. The author contends that cephalothorax development in arthropods laid the groundwork for vertebrate head development and further posits that the ostracoderms, an extinct class of jawless vertebrates, were the evolutionary bridge between the two groups. This theory reconciles seemingly disparate views on vertebrate origins and offers a comprehensive framework for understanding the evolution of segmented animals. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item. Bestandsnummer des Verkäufers 9781330481622_0
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