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Deuterostomes # 6 - and the mesoderm and coelom form from...

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Natalie Eng Deuterstomes #6 Bilateral Cephalization- The evolution of a head (anterior) end with sensory structures and a highly specialized brain to process sensory input; a feature of bilaterally symmetric animals, especially the vertebrates. The concentration of important nerve/sensory endings at the end of an animal with a single axis of symmetry. Cephalization-  a tendency in the development of animals to localization of important organs or parts in or  near the head.  Cephalochordata- a subphylum or other major taxon of the phylum Chordata comprising the lancelets and  characterized by extension of the notochord to the anterior as well as to the posterior end of the body. Deuterostomes- any member of the phyla (Chordata, Hemichordata, Echinodermata, Chaetognatha) in  which the anus appears first, developing at or near the blastopore, cleavage is radial and indeterminate, 
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Unformatted text preview: and the mesoderm and coelom form from outgrowths of the primitive gut. Echinodermata- a phylum of radially symmetrical coelomate marine animals consisting of the starfishes, sea urchins, and related forms. Radial Symmetry-Symmetrical arrangement of parts of an organism around a single main axis, so that the organism can be divided into similar halves by any plane that contains the main axis. The body plans of echinoderms, ctenophores, cnidarians, and many sponges and sea anemones show radial symmetry. Urochordata- A subphylum of chordates intermediate between the invertebrates and the true vertebrates . Water Vascular System- Functions in locomotion of echinoderm’s internal hydraulic system associated with the functioning of the tube feet....
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