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Biology 29 1 invertebrate evolution
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Biology 29 1 invertebrate evolution

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  • 1. 29-1 Invertebrate Evolution
  • 2. Radial Symmetry
    Body plan in which body parts repeat around the center of the body; characteristic of sea anemones and sea stars.
  • 3. Bilateral Symmetry
    Body plan in which only a single, imaginary line can divide the body into two equal halves; characteristic of worms, arthropods, and chordates.
  • 4. cephalization
    Concentration of sense organs and nerve cells at the front of an animal’s body.
  • 5. Coelom
    Fluid-filled body cavity lined with mesoderm
  • 6. Key Concept
    All invertebrates except sponges exhibit some type of body symmetry.
  • 7. Key Concept
    Invertebrates with cephalization can respond to the environment in more sophisticated ways than can simpler invertebrates.
  • 8. Key Concept
    Most complex animal phyla have a true coelom that is lined completely with tissue derived from mesoderm.

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