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Deuterostome Lab

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Deuterostome Lab

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Deuterostome Lab

  1. 1. Deuterostomes • First embryonic opening becomes the anus • Includes the phyla Echinodermata and Chordata
  2. 2. Echinodermata • Marine animals • Bilateral symmetry (larvae) • Three tissue layers • Coelomates • Hard exoskeleton – Name means “spiny skinned” • Movement: water vascular system – Tube feet that create or release suction • Today: Dissect starfish
  3. 3. Examples of bilateral larvae
  4. 4. Chordata • Not all chordates are vertebrates • Chordates have the following characteristics as embryos: • Dorsal (back) tubular nerve cord • A notochord – Supportive rod • A post anal tail • Pharyngeal pouches that become gill slits
  5. 5. Visual of chordate characteristics
  6. 6. Tunicates (Urochordates) • Invertebrate chordates • Adults maintain gill slits • Observe pictures and models in lab
  7. 7. Cephalochordates • Invertebrates • Lancelet example • Adult has all 4 characteristics • Observe pictures and models in lab
  8. 8. Vertebrate Innovations • Vertebral column • Segementation and specialization • Complex brain and cephalization • Jaws • Paired fins, gave rise to limbs • Gills, evolved into lungs
  9. 9. Today: Frog •Amphibian •First vertebrate able to live on land • Important external structures: – Tympanum: internal ear/eardrum – Nares: nostril/breathing hole
  10. 10. Frog Mouth • Eustacian tube: leads to ears • Maxillary and vomerine teeth • Glottis: opens to larnyx, vocal cords • Esophogus: leads to stomach
  11. 11. Internal Frog • If female, find ovaries with eggs • Identify two lungs (partially hidden by liver)
  12. 12. Internal Frog Continued • Liver and gallbladder • Esophagus and stomach • Small and large intestines
  13. 13. Internal Frog Continued • Pancreas and spleen • Fat bodies: store fat
  14. 14. Internal Frog Continued • Heart covered by pericardium – Three chambers (1 ventricle, 2 atria)
  15. 15. Internal Frog Continued •Kidneys (long and narrow) • Testes (yellow and oval) • Mesonephric ducts: carry urine •Cloaca: opening to outside

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