Chap 42 Amphibians

part 2

02 Feb. 2009 Amphibians.ppt 2

Class Amphibians

• Order Frogs (anura-without tail) – Hind legs enlarged, hopping or leaping

locomotion

Toads • Land dwelling- moist

soil • Camouflaged • Poison (Cane Toad)

Predators and Prey

Frogs • Live near water • Slippery , some

poisonous • Camouflage or

warning flag

Poison dart frogs- poison comes from eating fire ants and other

insect toxins

• Bullfrog (bottom)

• 3.5-6in • Record 8in

• West African Frog (Goliath frog)

• Largest

Frog skin

Frog skeleton

Bullfrog skeleton

Frog Eyes

Nares, typmanic membrane, vocal sacs

Mouth

Tongue attachment

Frog Heart- 3 chambers

Respiration

Cutaneous respiration

Digestion

Mesentary

Stomach, small intestine, large intestine

Pancreas

Excretory system

Kidney

Nervous system

Reproductive System

02 Feb. 2009 Amphibians.ppt 25

Amphibian Life Cycle • Larvae (immature form,

tadpoles) hatch in water, – Gills for gas exchange – 2 chamber heart – Tail and fins – Herbivore

• Metamorphosis to adult form – development of lungs – 3 chamber heart – growth of limbs, loss of tail in

frogs, toads – carnivore

• Adult usually terrestrial, some exceptions

Estivation