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Chondrichthyes

The Cartilage Fish p. 291-294. Chondrichthyes. Characteristics: - Skeletons of cartilage - Tooth-like scales ( placoid ) - Sharks, skates, rays - Replaceable teeth - First to show paired fins - Swim to maintain buoyancy (lack swim bladder). External Anatomy. Fusiform body

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Chondrichthyes

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  1. The Cartilage Fish p. 291-294 Chondrichthyes

  2. Characteristics: - Skeletons of cartilage - Tooth-like scales (placoid) - Sharks, skates, rays - Replaceable teeth - First to show paired fins - Swim to maintain buoyancy (lack swim bladder)

  3. External Anatomy • Fusiform body • Placoidscales • Spiracles • Lateral line • Detect changes in water pressure and chemistry • Fins: • Pectoral • Pelvic • Dorsal • Caudal • Anal

  4. Internal Anatomy • Lorenzini pores in nostril • Intestinal spiral valve • Slows passage of food for increase absorption

  5. Fertilization • Internal fertilization • Oviparous (egg) • Oviviparous (egg hatches inside body and young born live but without placental attachment) • Viviparous (live birth) * All three found in species of sharks, skates, and rays

  6. Bull Shark

  7. Hammerhead Shark

  8. Great White Shark

  9. Whale Shark

  10. Frilled Shark

  11. Goblin Shark

  12. Megalodon - Prehistoric

  13. Giant Stingray

  14. Stingray

  15. Sawtooth

  16. Manta Ray

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