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Vertebrates: Part I. Fishes & Amphibians. Fishes. Live in freshwater or saltwater Bone or cartilage protects brain & spinal cord Gills for respiration Mostly external fertilization. Classes of Fishes. Agnatha (Jawless Fish) Lampreys Chondrichthyes (Cartilaginous Fish) Sharks, rays

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Vertebrates part i l.jpg

Vertebrates: Part I

Fishes & Amphibians


Fishes l.jpg
Fishes

  • Live in freshwater or saltwater

  • Bone or cartilage protects brain & spinal cord

  • Gills for respiration

  • Mostly external fertilization


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Classes of Fishes

  • Agnatha (Jawless Fish)

    • Lampreys

  • Chondrichthyes (Cartilaginous Fish)

    • Sharks, rays

  • Osteichthyes (Bony Fish)

    • Most common fish



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Amphibians (Amphi- double)

  • Ectothermic

  • Most have metamorphosis

  • 2 Big Groups

    • Anura: frogs, salamanders

    • Caudata: salamanders, newts


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Problems with life on land

  • Drying out

  • Respiration

  • Reproduction

  • Movement

  • Temperature Control



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