Class Amphibia

• Amphibians live in aquatic and terrestrial habitats and need water for breeding.
• The body of an amphibian has a head and a trunk, some have a tail.
• Amphibians have moist skins without scales. Most of them have two pairs of limbs.
• Amphibian tympanum represents the ear.
• Amphibians have a 3 chambered heart.
• In amphibia they respire through their skin or through their mouth, in dire need of oxygen they use their lungs.
• Amphibians are poikilotherms
• Amphibians have Alimentary canal, urinary and reproductive tracts which open into a CLOACA which open to exterior.
• Amphibians respire through their gills in larval stage.
• Amphibians have separate sexes. They fertilize externally, oviparous and development is indirect.