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Phylum Chordata
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Phylum Chordata

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A brief overview of Phylum Chordata intended for a 9th/10th grade biology class

A brief overview of Phylum Chordata intended for a 9th/10th grade biology class

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Phylum Chordata Presentation Transcript

  • 1. Phylum Chordata Subphylum Vertebrata Subphylum Cephalochordata Subphylum Urochordata
    • have backbone
      • fish
      • birds
      • reptiles
      • amphibians
      • mammals
    Amphioxus (or “lancelets”) Tunicates (or “sea squirts”)
  • 2. Characteristics of Phylum Chordata
    • At some point, all chordates have:
      • gill slits
      • muscular tail
      • notochord (semi-rigid, rodlike structure) along the length of their body
      • dorsal nerve cord (bundle of nerves that lies above the notochord)
  • 3. adult tunicates (sea squirts)
  • 4. Tunicates:
    • filter feeders
    • have organs
    • sessile as adults
    • motile larvae have a notochord and nerve cord
    • notochord disappears in the adult
  • 5. larval tunicate
  • 6. larval tunicates in eggs
  • 7.  
  • 8. adult tunicate
  • 9. Adult Tunicates (Sea Squirts)
  • 10.   NPR story about invasive tunicates in Puget Sound http://www.npr.org/templates/story/story.php?storyId=7602142
  • 11. Amphioxus (or Lancelet)
  • 12. Amphioxus:
    • approx. 3 inches long
    • filter feeders
    • retains the notochord its entire life but never develops a backbone
  • 13.  
  • 14. Amphioxus (magnified)
  • 15. Vertebrates:
    • have notochord as embryos but eventually develop a backbone that surrounds the dorsal nerve cord
    • all have gill slits and muscular tails as embryos; some are retained and some disappear during development
    • 5 classes (birds, fish, reptiles, amphibians, mammals) with diverse characteristics