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Unit 5: The Evolutionary History of Diversity An Introduction to Animal Diversity Review
  1. Animals are multicellular, eukaryotes.
  2. The ancestor of animals diverged from those of about 1.2 billion-800 million years ago, and may have resembled modern .
  3. The kingdom diversified during the explosion, when many animal phyla appeared.
  4. Animals can be categorized by how their cells are organized according to a plan.
    • symmetry is like a flower pot, the body radiates from the center.
    • symmetry has a single plane of symmetry.
    • Most animals have that develop from embryonic layers of the .
    • Diploblastic animals such as jellyfish have germ layers: and . Triploblastic animals have germ layers, including a .
    • The mesoderm may develop into tissue that line a fluid–filled space called a .
      • A is a body cavity only partially lined by mesoderm tissues.
      • Organisms without a body cavity are considered .
  5. The coelomates show two major modes development.
    • Protostomes develop their from blastopore of the gastrula.
    • Deuterostomes develop their from the blastopore.
  6. Current phylogeny places as a clade with true , and divides the into three clades: , Lophotrochozoa, and Ecdysozoa.
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