23. Chordates

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Zoology class at Ava High School over Chordates, chapter 23

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  • 23. Chordates

    1. 1. Chordates Chapter 23
    2. 2. Phylum Chordata
    3. 3. Phylum Chordata
    4. 5. Phylum Chordata <ul><li>Chordates have: </li></ul><ul><ul><li>Bilateral symmetry </li></ul></ul><ul><ul><li>A coelom </li></ul></ul><ul><ul><li>Deuterostome development </li></ul></ul><ul><ul><ul><li>Radial, indeterminate cleavage </li></ul></ul></ul><ul><ul><ul><li>Enterocoelous coelom development </li></ul></ul></ul><ul><ul><li>Metamerism </li></ul></ul><ul><ul><li>Cephalization. </li></ul></ul>
    5. 6. Phylum Chordata <ul><li>Five distinctive characteristics define the chordates: </li></ul><ul><ul><li>Notochord </li></ul></ul><ul><ul><li>Dorsal tubular nerve cord </li></ul></ul><ul><ul><li>Pharyngeal pouches (gill slits) </li></ul></ul><ul><ul><li>Endostyle </li></ul></ul><ul><ul><li>Postanal tail </li></ul></ul>
    6. 7. Notochord <ul><li>The notochord is a flexible, rod-like structure derived from mesoderm. </li></ul>
    7. 8. Dorsal Tubular Nerve Cord <ul><li>In chordates, the nerve cord is dorsal to the alimentary canal and is a tube. </li></ul>
    8. 9. Pharyngeal Pouches and Slits <ul><li>Pharyngeal slits are openings that lead from the pharyngeal cavity to the outside. </li></ul>
    9. 10. Endostyle or Thyroid Gland <ul><li>The endostyle in the pharyngeal floor, secretes mucus that traps food particles. </li></ul>
    10. 11. Postanal Tail <ul><li>The postanal tail provides motility in larval tunicates and amphioxus. </li></ul>
    11. 12. Phylum Chordata <ul><li>Two protochordate subphyla </li></ul><ul><ul><li>Subphylum Urochordata </li></ul></ul><ul><ul><li>Subphylum Cephalochordata </li></ul></ul>
    12. 13. Subphylum Urochordata <ul><li>Tunicates </li></ul>
    13. 14. Subphylum Urochordata <ul><ul><li>Life Cycle of ascidian </li></ul></ul>
    14. 15. Subphylum Urochordata Adult of Ciona
    15. 16. Subphylum Urochordata
    16. 17. Subphylum Urochordata
    17. 18. Subphylum Cephalochordata
    18. 19. Subphylum Cephalochordata
    19. 20. Subphylum Vertebrata
    20. 21. Subphylum Vertebrata
    21. 22. Subphylum Vertebrata = Craniata
    22. 23. Neural Crest Cells Notochord (a) The neural crest consists of bilateral bands of cells near the margins of the embryonic folds that form the neural tube. (b) Neural crest cells migrate to distant sites in the embryo. Migrating neural crest cells Ectoderm Ectoderm Dorsal edges of neural plate Neural crest Neural tube
    23. 24. The Origin of Vertebrates
    24. 25. The Earliest Vertebrates
    25. 26. Ammocoete Larva of Lampreys <ul><li>Closely resembles the amphioxus lancelet </li></ul>
    26. 27. The Earliest Vertebrates
    27. 28. The Earliest Vertebrates
    28. 29. The Earliest Vertebrates <ul><li>Agnathans . </li></ul><ul><li>Gnathostomes </li></ul>

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