*It includes 3000 species.
*they are first evolved cold blooded land living animals.
*they can live on both land and water
*glands present on skin which keep it moist.
*two pairs of limbs for locomotion.
*skull is dicondylic.
*respiratory organs are lungs,buccopharyngeal cavity , skin and gills.
*heart are three chambered.
*kidneys are mesonephric.
*ear consists of internal and middle ear.
*10 pairs of cranial nerves are present.
*they breed in water.
*e.g.-Bufo (toad), Rana (frog),Hyla(tree frog), Salamandra (salamander), Ichthyophis(limbless amphibia).
BUFO
RANA
*they are first evolved cold blooded land living animals.
*they can live on both land and water
*glands present on skin which keep it moist.
*two pairs of limbs for locomotion.
*skull is dicondylic.
*respiratory organs are lungs,buccopharyngeal cavity , skin and gills.
*heart are three chambered.
*kidneys are mesonephric.
*ear consists of internal and middle ear.
*10 pairs of cranial nerves are present.
*they breed in water.
*e.g.-Bufo (toad), Rana (frog),Hyla(tree frog), Salamandra (salamander), Ichthyophis(limbless amphibia).
BUFO
RANA
HYLA
SALAMANDRA
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