Evolution of chordate structure
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Evolution of chordate structure an introduction to comparative anatomy. by Hobart Muir Smith

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Published by Holt, Rinehart and Winston in [New York] .
Written in English


  • Chordata -- Anatomy.,
  • Anatomy, Comparative.

Book details:

Edition Notes

Includes bibliography.

StatementIllustrated by Alice Boatright.
LC ClassificationsQL805 .S6
The Physical Object
Pagination529 p.
Number of Pages529
ID Numbers
Open LibraryOL5797567M
LC Control Number60010002

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This book discusses the origin and evolution of chordates. Chordates are animals characterized by the possession of a notochord, a dorsal neural tube, somites, pharyngeal gills, an endostyle, and a postanal tail. Chordates comprise three major taxa: cephalochordates (lancelets).   Chordates and the Evolution of Vertebrates. The most familiar group of chordates is the vertebrates. However, in addition to the subphylum Vertebrata, the phylum Chordata also contains two subphylums of invertebrates: Urochordata and Cephalochordata. In preparing this book my intentions were. lay the bare essentials of a groundwork for understanding the basic structure of primitive chordate, 2. to trace the most obvious or important trends in the evolution of this basic structure in various vertebraete lines, 3. to convey an appreciation of how the more advanced group of vertebrates.   Evolutionary relationships among the deuterostomes and debates over chordate ancestry have challenged zoologists for over a hundred years (9–15). Urochordate and hemichordate evolutionary relationships are central to understanding chordate evolution, but morphological disparities among taxa and a poor fossil record have hampered research by:

Chordate Origins and Evolution: The Molecular Evolutionary Road to Vertebrates focuses on echinoderms (starfish, sea urchins, and others), hemichordates (acorn worms, etc.), cephalochordates (lancelets), urochordates or tunicates (ascidians, larvaceans and others), and vertebrates. Understanding chordate origins and evolution has been a preeminent challenge for biologists over the last two centuries (Swalla and Xavier-Neto ). The phylum Chordata consists of three.   You need a hollow nerve cord that runs along the back, a notochord that runs just beside the nerve cord, pharyngeal pouches in the neck and throat area, as well as a tail that runs below the anus. These apply to every chordate at some point in their life cycle. A majority of them occur for humans in the embryonic stage.   Here we describe the structure and gene content of the highly polymorphic ∼megabase genome of the Florida lancelet Branchiostoma floridae, and analyse it in the context of chordate by:

  The chordates are named for the notochord, which is a flexible, rod-shaped structure that is found in the embryonic stage of all chordates and in the adult stage of some chordate species. It is located between the digestive tube and the nerve cord, and . The chordates are named for the notochord: a flexible, rod-shaped structure that is found in the embryonic stage of all chordates and also in the adult stage of some chordate species. It is located between the digestive tube and the nerve cord, providing skeletal support through the length of the body.   A tissue with many of the defining features of vertebrate cellular cartilage is shown to form transiently in larvae of the invertebrate chordate amphioxus, indicating that the origin of the Cited by:   According to the alternative scenario or progressive evolution of motile adults, the chordate ancestor was free-living and vermiform, and the sequence of ancestral forms is thought to have consisted of motile, bilaterally symmetric organisms, as opposed to larvae [12,17,18,52–54]. Motile forms such as enteropneust hemichordates and cephalochordates are typically considered close to Cited by: