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Evolution Of Amphibia Essay

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ORIGIN AND EVOLUTION OF AMPHIBIA Amphibians originated from sarcopterygian fish lungs and bony-limbed fins in the early Devonian period. They were the first to come out of their ancestral aquatic home to settle in completely different conditions i.e. on dry land. They flourished in Carboniferous period and were present until the Triassic, after which most of them disappeared. They were the first to come out of their ancestral aquatic home to settle in completely different conditions i.e. on dry land. The early amphibians must have possessed certain fundamental characters essential for living on land. Some of the important characters necessary for land dwelling are limbs for locomotion, loss of internal gills with the development of lungs.
Possible ancestors-
*Dipnoans or crossopterygians are the two possible ancestors.
Dipnoan origin of Amphibia
*Dipnoans were thought to be in the direct line of tetrapod evolution due to the similarities in a number of structural and functional characters between the two.
*The Pectoral and Pelvic girdle of dipnoans show some amphibian features but were unable to support the weight of the body on land.
*The dipnoans have a number of specialised characters.
*Such specialised group cannot be the ancestors of another group.
*Similarities in circulatory and respiratory system of Dipnoi and amphibian may be due to

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