Ciencias Naturales Helminths Zoología Acanthocephala Amphibians Anurans Brazil Cestoda Chiggers Diet Digenea Helicops infrataeniatus Infestation rates Intradermic parasite Lymnaea columella Lymnaea diaphana Lymnaea viatrix Nematoda Parasitism Reptiles Serpentes Swamps first and second internal transcribed spacers of the RNA ribosomal gene polymerase chain reaction and restriction fragment length polymorphism subunit 16S of mitochondrial RNA ribosomal gene