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Evidence is presented supporting the viewpoint that all the moderns Amphibia are clearly related. It is suggested that the three living orders constitute a natural monophyletic group-the infra-class Lissamphibia sensu Gadow. Other theories are briefly reviewed. Finally an attempt is made to determine the Paleozoic ancestors of the Recent amphibians, but the available evidence is contradictory and inconclusive.
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Parsons et al. (1963) studied this question.
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