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The largest living amphibian is the 1.8 m (5 ft 11 in) Chinese giant salamander (Andrias davidianus), but this is dwarfed by the extinct 9 m (30 ft) Prionosuchus from the middle Permian of Brazil. The study of amphibians is called batrachology, while the study of both reptiles and amphibians is called herpetology.
Reptiles Reptiles are essentially amphibians that are better adapted to life on land. Worldwide, there are ~7000 species in 4 orders.The arrangement of legs supports the reptilesâ body weight more effectively than amphibians, allowing them to have bigger bodies and to run.The wet skin that is characteristic of amphibians has been covered by dry scales and the eggs are encased in a shell to minimize water loss.mphibians Amphibians are direct descendants of fishes. They have damp skin like fish and most lay eggs lacking shells in water. Unlike fish, amphibians lack scales and have a more complex circulatory system. Most are terrestrial at some point in the life cycle.