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Phylum Chordata

Phylum Chordata. Ch. 34. Characteristics. Notochord Dorsal, hollow nerve cord Muscular post-anal tail Gill slits. Gills. Simple Chordates. Urochordata – tunicates Cephalochordata – lancelets. Challenges Faced. Chasing food Grabbing food when close Getting oxygen from environment

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Phylum Chordata

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  1. Phylum Chordata Ch. 34

  2. Characteristics • Notochord • Dorsal, hollow nerve cord • Muscular post-anal tail • Gill slits

  3. Gills

  4. Simple Chordates • Urochordata – tunicates • Cephalochordata – lancelets

  5. Challenges Faced • Chasing food • Grabbing food when close • Getting oxygen from environment • Getting oxygen through body • Preventing dehydration • Maintaining body temperature • Keeping embryos from drying out

  6. Fish • Agnathans • Evolution of jaws • Lateral line • Swim bladder • operculum

  7. Fish • Evolution of jaws

  8. Fish - Chondrichthyes • Lateral line

  9. Fish - Osteichthyes • Operculum • Swim bladder

  10. What type of circulatory system?

  11. Class Amphibia

  12. Class Amphibia • Gills as juvenile • Lousy lungs • Moist skin

  13. Class Amphibia • Improved circulation

  14. Class Reptilia

  15. Class Reptilia • Paraphyletic

  16. Class Reptilia • Dry skin • Amniotic eggs • Internal fertilization

  17. Class Reptilia • Branching in lungs • Partial septum in heart

  18. Class Aves

  19. Class Aves • Lightweight, hollow bones • Large breastbone • Feathers / endotherms

  20. Class Aves • Four-chambered heart

  21. Class Aves • Best lungs – one-way respiration

  22. Class Mammalia

  23. Class Mammalia • Monotremes • Marsupial • Eutherians

  24. Class Mammalia • Mammary glands • Hair • Specialized teeth

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