1. Class Amphibia
limbs with girdles of bone (adaptation for walking on land)
a tongue used for catching prey and for sensory input
eyelids (keep eyes moist)
ears for detecting sound in air
larynx adapted for vocalization
skin (glands, no scales) active in osmotic balance & respiration
lung used exclusively for gas exchange
reproduction in water (external fertilization
three chambered heart (2 atria, 1 ventricle)

2. Amphibian Circulation

3. Class Amphibia Order Gymnophiona (Caecilians)
Order Caudata (Salamanders)
Order Anura (Toads and Frogs)

4. internal fertilization
The Caecilians
Order Gymnophiona
worm-like amphibians
limbless
carnivores
internal fertilization
tropical

5. Reduced eyes

6. Reproduction
carry eggs
lay eggs

7. The Salamanders tailed, paired limbs carnivores bend side-to-side
metamorphic
neoteny

8. Three Types of Salamanders
terrestrial
entirely aquatic
amphibious
Respiration through skin

9. Salamander Reproduction

10. Paedomorphosis (Neotony)

11. The Toads and Frogs
no tails
carnivores
metamorphic
no neoteny

12. Reproduction
amplexus

14. Conservation Issues
Wetland Loss
Deformations