Amphibians 1st tetrapods.

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Presentation transcript:

Amphibians 1st tetrapods

Classification Kingdom – Animalia Phylum - Chordata Class Amphibia 3 Orders Anura (Frogs & Toads) Urodela (Salamanders) Apoda (Caecilians)

Characteristics Ectothermic 3-chambered heart (Double circulation) Smooth skin, lacks scales (Desiccation if dry) Cutaneous respiration Lungs (Positive pressure mouth breathing) Excretes urea Lack claws on toes

Anura

In amphibians, the blood makes two passes through the heart. Heart ---> lungs --> heart ---> body

Metamorphosis Tadpoles Frogs Herbivorous Carnivorous Aquatic Aquatic & Terrestrial Single loop circulation Double loop circulation Gills Lungs

Amplexus

Frogspawn

Tadpole

Froglet

Frog Defenses

Bioindicators

Urodela Salamanders Newts (Efts) Mudpuppies

Apoda