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Amphibians. Amphibia. Comes from the Greek amphi “both” and bios “life” Appeared during the Devonian period. Adaptations. Four limbs Lungs instead of gills Both internal & external nares (nostrils) Three chambered heart (two atria & one ventricle).

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amphibia
Amphibia
  • Comes from the Greek amphi “both” and bios “life”
  • Appeared during the Devonian period
adaptations
Adaptations
  • Four limbs
  • Lungs instead of gills
  • Both internal & external nares (nostrils)
  • Three chambered heart (two atria & one ventricle)
slide4

Skin with keratin (protein) to prevent water loss

  • Most with smooth, moist skin to take in dissolved oxygen
  • Some with oral glands to moisten food they eat
slide5

Ectothermic - body temperature changes with environment

  • Show dormancy or torpor (state of inactivity during unfavorable environmental conditions)
  • Hibernate in winter and aestivate in summer
  • Males with vocal sacs to croak
  • Digested system adapted to swallow prey whole
  • Well developed muscular system
anura
Anura
  • Frogs
  • Toads
characteristics
Characteristics
  • Both terrestrial & freshwater species
  • Tadpole with tail, gills, & two-chambered heart
  • Adults without a tail, four limbs, & lungs
  • Frog skin smooth & moist for cutaneous respiration, while toads is rough & warty (poison glands)
slide9

Aquatic larva called tadpole goes through metamorphosis to adult

  • Metamorphosis controlled by hormone called thyroxine
reproduction
Reproduction
  • External fertilization with amplexus (male clasps back of female as sperm & eggs deposited into water)
slide12

Eggs coated with sticky, jelly like material so they attach to objects in water & do not float away

  • Eggs hatch into tadpoles in about 12 days
caudata
Caudata
  • Newts and Salamanders
characteristics1
Characteristics
  • Have elongated bodies with a tail & four limbs 
  • Smooth, moist skin for cutaneous respiration
  • Size from a few centimeters long to 1.5 meters
  • Nocturnal when live in drier areas
  • Newts are aquatic species
slide16

Lay eggs in water or damp soil

  • Some bear live young
  • May or may not go through tadpole stage (some hatch & look like small adult)
  • All newts are salamanders but not all salamanders are newts
apoda
Apoda
  • caecilians
slide18

Tropical, burrowing, worm like amphibians

  • Legless
  • Small eyes & often blind
  • Eat worms & other invertebrates
  • Average length 30 centimeters, but can grow up to 1.3 meters
  • internal fertilization
  • Female bear live young
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