Amphibians

AmphibiansA. Characteristics of

Amphians 1. Metamorphosis 2. Obtaining Oxygen 3. Circulatory System 4. Movement 5. ReproductionB. Types of Amphibians 1. Anura 2. Caudata 3. Gymnophiona


Amphibians 1. Metamorphosis 2. Obtaining Oxygen 3. Circulatory System 4. Movement 5. ReproductionB. Types of Amphibians 1. Anura 2. Caudata 3. Gymnophiona

• Amphibians are vertebrate

• They are ectothermic• They can live in both

aquatic and terrestrial (land) environments

• The name amphibian comes from the Ancient Greek word 'amphibios' meaning living a dual life

• Moist Skin



• In frogs:• eggs hatch and give rise to

tadpoles, that have external gills and are mainly vegetarian

• As the tadpole grows, internal gills and hind limbs form.

• Mouth and tongue enlarge • Lungs form and gills disappear• 2chamber heart changes to 3

chamber heart• Front limbs form• Resorption of the tail.



• In salamanders:• Eggs hatch around thirty days• Gills to breathe underwater • Uses tail for movement• Eat tiny creatures that live in the

water • At three weeks legs start to grow.

The back legs develop first, followed shortly by front .

• Uses both legs and tail for movement.

• At 2 months attain adult shape: develop lungs. lose gills, lose tail fin and attain their adult coloring

• At two years reach their full adult length, at which point they will return to the water to mate.



• Lungs• Skin• Even when the lungs

are used, Amphibians can obtain up to 50% of the needed oxygen and let out up to 70% of the carbon dioxide through the skin



• Closed circulatory system

• 2 chamber heart as tadpole

• 3 chamber heart as adult



• Tail - swim• Legs – jump, crawl, run• Webbed feet - swim• Sticky pads on toes -

climb• burrowing



• Reproduce sexually• Both external and

internal fertilization



• Ah-NOO-ra



• Ah-NOO-rah• Without tail• Frogs and toads• Make noise to

communicate• External fertilization• Amplexus:• Female lays the eggs which

are in a jellylike layer. • Male immediately

fertilizes them• Limbs used for crawling,

running, hopping



• Cau-DAY-ta



• Cau-DAY-ta• With tail• Salamanders, Newts,

Waterdogs, Mudpuppies

• Internal fertilization • Limbs used for crawling

and running• Scent and visual forms

of communication



• Gym-no-phi-o-na



• Gym-no-phi-o-na• Without limbs• Caecilians• Burrows in soft dirt• Lay eggs/live births• Tentacle• Poor eye sight• Terrestrial/aqutic

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Amphibians