Amphibians

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Amphibians

• 3/26/07
• What is a double life?

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Amphibians

• Kingdom Animalia
• Phylum Chordata
• Class Amphibia? Double Life
• Definition Vertebrate that lives in water as
  larva and on land as an adult. Breathes with
  lungs as an adult, has moist skin, lacks scales
  and claws.
• Example Frogs, Toads, Salamanders, Caecilians

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Feeding

• Mouth? Esophagus? stomach? small intestine ?
  large intestine? cloaca

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Respiration

• Larvae? skin and gills
• Adult? lungs and skin (some)

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Circulation

• Heart? 3 chambers
• Left and right atrium and a ventricle
• Closed circulatory system

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Excretion

• Cloaca ammonia? primary waste product

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Reproduction

• Oviparous
• Most external fertilization
• Most salamanders? internal fertilization

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Movement

• Larvae? swim (like fish with broad tail)
• Adult? jump/walk

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Response

• Nictitating membrane eye covering
• Tympanic membrane hearing

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Groups of Amphibians

• Salamanders
• Long bodies and tails, 4 legs, usually live in
  moist environment
• Frogs and Toads
• Long well developed jumping legs, Frogs live near
  water, Toads live in deserts and moist areas
• Caecilians
• Legless animals that live in water and burrow in
  moist soil, fishlike scales in skin