1. Amphibians

2. What Is an Amphibian? •Live in wet places •Ectothermic •Carnivorous
•Moist skin
•Lay eggs in water
•Most larvae have gills
•3-chambered heart
•Terrestrial adults respire through lungs and skin
•Ex: salamanders, frogs, toads & caecilians

3. Evolution of Amphibians
1st amphibians resembled lobe-finned fishes with legs
Appeared in the late Devonian Period, about 360 mya
Amphibians were the first chordates to live at least part of their lives on land.

4. Amphibian Adaptations
•Stronger bones in limbs, allowing more efficient movement.
•Lungs & breathing tubes enabled amphibians to breathe air.
•Developed sternum to support & protect internal organs.

5. Orders of Amphibians
Urodela – salamanders & newts
Apoda - caecilians

6. Orders of Amphibians
Anura – frogs and toads

7. Anatomy of a Frog
Circulatory system

8. Anatomy of a Frog
Skeletal system

9. Anatomy of a Frog

10. Anatomy of a Frog

11. Anatomy of a Frog
Nictitating membrane – a transparent membrane that protects the eye from damage under water and keeps it moist on land.
Tympanic membrane - external eardrum that vibrates sending sound waves
to the inner ear.

12. Amphibian Reproduction
Reproduction in amphibians is external. The male will grip the female tightly and fertilizes eggs as they are laid.

13. Amphibian Reproduction