Amphibian diversity

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Biologists have described more than 7,200 species of living amphibians worldwide, and at least 800 occur in Southeast Asia. Amphibious tetrapods were the dominant land vertebrates during the Carboniferous and Lower Permian Periods, when diverse and extremely large forms emerged. Those that survive today can be classified into three distinct groups: Anura (frogs and toads), Caudata (salamanders and newts), and Gymnophiona (caecilians).