what is the characteristics of class Amphibia ?
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Characteristics of Class Amphibia
The characteristics of the organisms present in class amphibia are as follows:
- These can live both on land and in water.
- They are ectothermic animals, found in a warm environment.
- Their body is divided into head and trunk. The tail may or may not be present.
- The skin is smooth and rough without any scales, but with glands that make it moist.
- They have no paired fins. Unpaired fins might be present.
- They have two pairs of limbs for locomotion.
- They respire through the lungs and skin. Gills might be present externally in some adults.
- The heart is three chambered.
- The kidneys are mesonephric. The excretory material includes ammonia and urea.
- They possess ten pairs of cranial nerves.
- The lateral line is present during their development.
- The sexes are separate and fertilization is usually external. However, in salamanders, the fertilization is internal.
- Development is indirect with metamorphosis.
- Breeding occurs in water. The copulatory organs are absent in males.
Eg., Frogs, Salamanders.
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