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Gymnophiona (caecilians) constitute one of the three extant orders of Lissamphibia, the other two orders being Anura (frogs and toads) and Caudata (newts and salamanders). The 207 nominate caecilian species described to date under 10 families are confined to certain tropical and subtropical regions of South America, Africa and Asia. The habitat of most caecilians is moist and porous soil that is rich in humus and organic matter. Whereas members of the South American Typhlonectidae include aquatic and semiaquatic forms.
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