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Intro to Chordates p. 270-274

Intro to Chordates p. 270-274. Superc lass Agnatha. Integument: slimy skin Temperature control: e ctotherm Limb Structure: no paired limbs Gas Exchange: gills Fertilization: external. Class Chondrichthyes. Integument: scales Temperature control: e ctotherm

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Intro to Chordates p. 270-274

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  1. Intro to Chordatesp. 270-274

  2. Superclass Agnatha • Integument: slimy skin • Temperature control: ectotherm • Limb Structure: no paired limbs • Gas Exchange: gills • Fertilization: external

  3. Class Chondrichthyes • Integument: scales • Temperature control: ectotherm • Limb Structure: 2 pairs of fins • Gas Exchange: gills • Fertilization: internal

  4. Class Osteichthyes • Integument: slimy skin and scales • Temperature control: ectotherm • Limb Structure: 2 pairs of fins • Gas Exchange: gills • Fertilization: external

  5. Class Amphibia • Integument: thin, moist skin • Temperature control: ectotherm • Limb Structure: 2 pairs of legs • Gas Exchange: gills, lungs, skin • Fertilization: external

  6. Class Reptilia • Integument: dry, scaly • Temperature control: ectotherm • Limb Structure: 2 pairs of legs • Gas Exchange: lungs • Fertilization: internal

  7. Class Aves • Integument: feathers • Temperature control: endotherm • Limb Structure: wings, one pair legs • Gas Exchange: lungs • Fertilization: internal

  8. Class Mammalia • Integument: hair • Temperature control: endotherm • Limb Structure: 2 pairs of legs • Gas Exchange: lungs • Fertilization: internal

  9. Hallmarks of Phylum Chordata • Notochord • Single, tubular, dorsal nerve cord • Pharyngeal slits • Postanal tail • Endostyle * Characteristic present at some point during development!!!

  10. Superclass Agnathap. 287-291 • “circular mouths” • In place of jaws is an oral sucker • Most primitive of all fish • External fertilization • No stomach • Heart: 2 chambers (1 ventricle; 1 artia) • No fins • Eel body form • Poor eye development (hagfish only) • Pore-like gill openings

  11. Class Myxini • Includes hagfish • Feed on dead or dying fish • Scavengers • Completely blind, well developed sense of smell and touch • Generate large amounts of slime for defense

  12. Class Petromyzones • Includes lampreys • Most are parasitic, feed on blood and fluids of fish • Destructive to fisheries (ex. Great Lakes) Millions of dollars lost each year

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