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Basic Animal Evolution

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1. First key branch was between eumetazoan(tissues) and parazoan(no tissues) ... Coelom formation. Fate of blastopore. 9/13/09. 8. 9/13/09. 9. 9/13/09. 10. 9/13/09. 11 ... – PowerPoint PPT presentation

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Title: Basic Animal Evolution


1
Basic Animal Evolution
  • JP Slovak

2
Introduction
  • Characteristics of animals
  • Multicellular
  • Heterotrophic
  • Lack cell walls
  • Cells are held together by proteins
  • Tight junctions
  • Desmosomes
  • Gap junctions
  • Excitable tissue
  • Most reproduce sexually
  • Blastula
  • gastrulation

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Animal Phylogeny and Diversity
  • Monophyletic
  • Goes back 700 mya
  • 1. First key branch was between
    eumetazoan(tissues) and parazoan(no tissues)
  • 2. Eumetazoans branch into radiata and bilateria
  • Symmetry
  • Cephalization in bilateria
  • All bilateria have 3 germ layers

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Animal Phylogeny and Diversity
  • 3. Evolution of body cavities
  • Acoelomates
  • Psuedocoelomates
  • Coelomates
  • 4. Coelomates branch into protostomes and
    deuterostomes
  • Differ in
  • Cleavage
  • Coelom formation
  • Fate of blastopore

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Origins of animal diversity
  • 35 phyla
  • Cambrian explosion
  • Lasted approximately 20 my
  • Started about 550 mya
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