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Animal Evolutionary Classification

Animal Evolutionary Classification. Chapter 29. KEY evolutionary events. Choanaflagellate (top box) Common ancestor of animals. Next evolutionary split. EUMETAZOA true tissues all other animals. PARAZOA no true tissues sponges.

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Animal Evolutionary Classification

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  1. Animal Evolutionary Classification Chapter 29

  2. KEY evolutionary events • Choanaflagellate (top box) • Common ancestor of animals

  3. Next evolutionary split • EUMETAZOA • true tissues • all other animals PARAZOA • no true tissues • sponges This is a layer of sponge made up of a cluster of choanocytes

  4. evolutionary split in Eumetazoa • Radial Symmetry • um...round • jellyfish, hydra and corals Bilateral Symmetry • right/left side • dorsal/ventral

  5. Pretty pics of radial symmetry

  6. Bilateral animals splits into 3 distinct groups • Coelomates • Pseudocoelomates • Acoelomates

  7. Coelomates • Coelom = a fluid filled body cavity • Coelomates have a true fluid filled body cavity • The coelom is between the body wall and gut • Completely lined by mesoderm • What??? Just write it and we will go into it more – promise!

  8. Pseudocoelomates • Pseudo = fake • Fake coelom because they have a fluid filled body cavity but… • it is NOT enclosed by the mesoderm • Ex. roundworms

  9. Acoelomates • A=without • Acoelomates do not have a fluid-filled body cavity • Ex. Flatworms (planaria and sea slugs)

  10. Coelomates divide yet again • Protostomes • Deuterostomes

  11. Protostomes vs Deuterostomes “The key differences between these coelomate animals is in embryonic development – we’ll get into this more as well, promise! So just write the terminology down for now.” -Hartford

  12. Protostomes • Blastopore becomes the mouth • Spiral determinate cleavage • Coelom form from solid mass of mesoderm splitting

  13. Deuterostomes • Blastopore becomes anus • Radial indeterminate cleavage • Coelom forms from out-pockets of mesoderm

  14. Coelom and germ layers PAGE 532 – Add to notes

  15. COELOMATES

  16. Don’t be grossed out but… ECTODERM DIGESTIVE TRACT (inside tube) MESODERM ENDODERM

  17. Pseudocoelomates

  18. Fun stuff: Parasitic Roundworms • Filarial worm causes this…

  19. Acoelomates

  20. INVERTEBRATES • Aquatic to terrestrial – what evolutionary developments?

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