Amphibians Class Amphibia

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AmphibiansClass Amphibia
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AMPHIBIANS

• Amphibians begin life in water.
• They start out as tadpoles and breathe with gills
• As they grow, they develop lungs and legs
• They move to land as adults
• Amphibians move back to water to lay eggs.

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Amphibians

• LIVE ON LAND BUT STAY NEAR THE WATER
• Chinese Giant Salamander

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Adaptations

• Mobile, muscular tongue allows amphibians to
  capture and manipulate food.

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Adaptations

• Breathe through the skin or with the use of gills
  or lungs

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Amphibians return to the water to lay eggs.

• Eggs do not have shells

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Strategies to keep eggs wet

• Laying eggs directly in water
• Laying eggs on moist ground
• Wrapping eggs in leaves

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Pygmy Marsupial FrogFlectonotus pygmaeus
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Tadpoles

• Some frogs start as tadpoles
• Have gills and a broad-finned tail

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Tadpole into Adult Frog

• Gills are reabsorbed and lungs develop
• Circulatory system is reorganized to send blood
  to the lungs
• Tail fin is reabsorbed

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Tadpole into Adult Frog

• Body grows limbs and completely reorganizes its
  skeleton, muscles, and parts of the nervous
  system.
• Digestive system is rebuilt to handle a
  carnivorous diet.

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Amphibians

• Salamanders
• Frogs

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Salamanders

• More than 300 species
• Long body
• Four walking limbs
• tail

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Frogs

• Over 3000 species
• Largest group of living amphibians

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Adult Frogs

• Tailless bodies
• Long, muscular hind limbs
• Webbed feet
• Exposed eardrums
• Bulging eyes

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Adult Frogs

• Bodies adapted for jumping
• Elongated bones in their hips, legs and feet for
  increased speed and power
• Hind legs have fused bones that absorb the shock
  of landing

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Toads

• One family of frogs
• Rougher, bumpier skin
• Shorter legs- not good jumpers
• Glands make toxins that protect them from
  predators also in tropical frogs

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Frogs

• Live in every environment on Earth except at the
  poles and the driest deserts.