Objectives: 1. Describe amphibian
respiration and circulation. 2. Compare
characteristics of an adult frog to a
tadpole. 3. List the three amphibian orders
and provide an example for each.
Characteristics
1) Legs: Except caecilians
2) Lungs: Larva
Gills
Adult Lungs
Exception: Salamanders do not have lungs
Note: There is 20x more O2 in the air than
in the water
http://www.flickr.com/photos/michiganherper/2454377491/
3) Double-Loop Circulation & Heart:
Larva 2 chambered heart
Adult 3 chambered heart
Pulmonary vein is found in amphibians but not fish
Circulation:
Fish: heartgillsorgans heart
Amphibian: heart lungspulmonary vein
heart organsheart
4) Cutaneous Respiration: Breath through moist
skin
http://universe-review.ca/I10-82-circulatory.jpg
AMPHIBIANS
3 Orders
#1 Anura: Frogs and Toads
#2 Urodela: Salamanders and Newts
#3 Apoda: legless caecilians
Amphibian Orders
#1 Order Anura
1)Frogs and Toads
2)Adults are carnivorous
3)Metamorphosis: EggTadpoleAdult frog
Tadpole
Frog
Gills
Lungs
Herbivore
Carnivore
2-chambered heart3-chambered heart
Fins
Legs
1
#2 Order Urodela
1) Salamanders and Newts
2) Fertilization: (like frogs) sexual and external
Metamorphosis: less dramatic the young are
smaller versions of adults, except adults lose
their gills.
Newts: Young Terrestrial eft stage Aquatic
Adult Stage (Change in color, gain gills and tail
fin).
#3 Order Apoda
1) Legless caecilians
2) Burrow into soil
3) Internal fertilization
2