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Lecture 6 ANIMAL EVOLUTION: THE VERTEBRATES

Lecture 6 ANIMAL EVOLUTION: THE VERTEBRATES. Cartilaginous Fishes. Include species of sharks and rays. Have fins, cartilaginous skeleton & 5-7 gill slits on both sides. Most have scales. Scales: small, bony plates that protect their body surfaces without weighing them down.

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Lecture 6 ANIMAL EVOLUTION: THE VERTEBRATES

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  1. Lecture 6ANIMAL EVOLUTION: THE VERTEBRATES

  2. Cartilaginous Fishes • Include species of sharks and rays. • Have fins, cartilaginous skeleton & 5-7 gill slits on both sides. • Most have scales. • Scales: small, bony plates that protect their body surfaces without weighing them down. • Jaws are used to grab and rip chunks of prey.

  3. The Sharks and The Rays

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