Chapter 19 Amphibians: The First Terrestrial Vertebrates

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Chapter 19Amphibians The First Terrestrial
Vertebrates
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Evoluntionary perspective

• Amphibians are tetrapods.
• Tetrapod in the sense refer to living amphibians
  often called lissamphibia

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Order caudata

• Members of this group is called caudata are the
  salamnders./
• They posses a tail throughout life, and both
  pairs of legs, when present, are relatively
  unspecialized.

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Order anura

• The order anura or salientia includes about 3,500
  species of frogs and toads.
• Anuaran live in most moist environment, except in
  high latitudes and some oceanic island.

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Nutrition and the digestive system

• Mosts adult amphibians are carnivores that feed
  on a wide variety of invertebrates.

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Gas exchange

• Gas exchanges across the skin is called cutaneous
  respiration.
• This buccopharyn geal respiration account for 1
  of 7 of total gas exchange.
• Pulmonary ventilation occurs by a bucceal pump
  mechanism.

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vocalization

• Sound production is primarily areporoductive
  function of male anurans.
• The sound production appartus iof frog consists
  of the larynx and its vocal cords.