Phylum Chordata Subphylum Vertebrata Subphylum Cephalochordata Subphylum Urochordata <ul><li>have backbone </li></ul><ul><...
Characteristics of Phylum Chordata <ul><li>At some point, all chordates have: </li></ul><ul><ul><li>gill slits </li></ul><...
adult tunicates (sea squirts)
Tunicates: <ul><li>filter feeders </li></ul><ul><li>have organs </li></ul><ul><li>sessile as adults </li></ul><ul><li>moti...
larval tunicate
larval tunicates in eggs
 
adult tunicate
Adult Tunicates (Sea Squirts)
  NPR story about invasive tunicates in Puget Sound http://www.npr.org/templates/story/story.php?storyId=7602142
Amphioxus (or Lancelet)
Amphioxus: <ul><li>approx. 3 inches long </li></ul><ul><li>filter feeders </li></ul><ul><li>retains the notochord its enti...
 
Amphioxus (magnified)
Vertebrates: <ul><li>have notochord as embryos but eventually develop a backbone that surrounds the dorsal nerve cord </li...
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Phylum Chordata

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

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Transcript of "Phylum Chordata"

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

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