Amphibians
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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)



  • 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)


  • Long hind limbs for jumping



Reproduction
Reproduction adult

  • External fertilization with amplexus (male clasps back of female as sperm & eggs deposited into water)



Tad pole life cycle
Tad pole life cycle to objects in water & do not float away


Caudata
Caudata to objects in water & do not float away

  • Newts and Salamanders


Characteristics1
Characteristics to objects in water & do not float away

  • 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


  • Lay eggs in water or damp soil to objects in water & do not float away

  • 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 to objects in water & do not float away

  • caecilians


  • Tropical, burrowing, worm like amphibians to objects in water & do not float away

  • 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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