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Chordates

Chordates. What is a Chordate?. Hollow nerve cord Notochord: long supporting rod below nerve cord Pharyngeal pouches: gills Tail. Notochord. Muscle segments. Hollow nerve cord. Anus. Tail. Mouth. Pharyngeal pouches. Nonvertebrate Chordates. Tunicates Filter-feeders

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Chordates

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  1. Chordates

  2. What is a Chordate? • Hollow nerve cord • Notochord: long supporting rod below nerve cord • Pharyngeal pouches: gills • Tail

  3. Notochord Muscle segments Hollownerve cord Anus Tail Mouth Pharyngeal pouches

  4. Nonvertebrate Chordates • Tunicates • Filter-feeders • No notochord or tail • Lancelets • Exchange gas through their skin • Closed circulatory system: no true heart

  5. Fishes • Aquatic vertebrates • Fins: movement • Scales: protection • Gills: gas exchange • Evolution of jaws and fins were important developments in fish

  6. Form and Function • Feeding: every mode • Circulation: 2 chamber heart • Excretion: release ammonia • Chemoreceptors: taste and smell • Lateral line system: detect gentle currents and vibrations • Swim bladder: buoyancy

  7. Jawless Fish • No true teeth or jaws • Skeletons: fibers and cartilage • Keep notochords as adults • Lampreys: parasites on fish, whales, & dolphins • Hagfishes • Light detecting sensors • Feed on dead & dying fish • Secrete slime • Have six hearts

  8. Cartilaginous Fish • Sharks, rays, skates • Skeleton: cartilage • Toothlike scales • 1,000’s teeth

  9. Bony Fish • Skeletons: bone • Ray-finned fish • Fins: bony spines connected a thin layer of skin • Lobe-finned fish • Fleshy fins support bones • Some bones are jointed

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