1. Amphibians
Class Amphibia

2. Amphibians are tetrapod vertebrates (four footed)
Include all tetrapod vertebrates that are not amniotes (lay eggs on land)
Frogs, toads, salamanders, and newts

4. Characteristics Integumentary Skeletal/Muscular
Moist skin with mucus glands
Found near moist habitats to keep skin damp
Skeletal/Muscular
Endoskeleton
Adult: legs for walking or jumping; no legs
Larva: swim

5. Characteristics Circulatory Reproductive
Adult: 3 chambered heart, closed-double loop
Larva: 2 chambered heart
Reproductive
External fertilization; eggs must stay moist (no shell)

6. Characteristics Nervous Respiratory
Brain; eyes w/ nictitating membrane;
tympanic membrane (like a drum) for hearing; lateral lines
Respiratory
Adult: through lungs, skin, & lining of the mouth
Larva: through skin and gills

7. Characteristics Digestive Excretory
Complete digestive system (mouth --> anus)
Adult: carnivore
Larva: herbivore or filter feeder
Excretory
Kidneys filter wastes from blood, urine travels through ureters to urinary bladder and out through cloaca

8. Characteristics Body Temperature Habitat
Ectothermic (cold blooded, find heat from an outside source like the sun)
Habitat
Adult: live on land near water
Larva: live in water

9. Lifecycle of a Frog Adult Frog Young Frog Fertilized Eggs Tadpoles
Adults are typically ready to breed in about one to two years.
Frog eggs are laid in water and
undergo external fertilization.
The eggs hatch into tadpoles a few days to several weeks later.
Tadpoles gradually grow limbs, lose their tails and gills, and
become meat-eaters as they develop into terrestrial adults.

10. Evolution
The first amphibians looked similar to lobe-finned fish

11. Groups of Amphibians
Salamanders – have long bodies & tails, most have 4 legs, usually live in moist woods

12. Groups of Amphibians
Frogs & toads – both jump & lack tails; frogs more closely tied to water

13. Groups of Amphibians
Caecilians – legless animals; live in water or burrow in moist soil; many have fishlike scales,resemble earthworms or snakes