The study of the Heteroptera (Hemiptera) fauna of the Rio Pilcomayo National Park, resulted in an inventory composed of: Alydidae (3 spp.), Aradidae (1 sp.), Belostomatidae (4 spp.), Berytidae (1 sp.), Blissidae (4 spp.), Colobathristidae (1 sp.), Coreidae (4 spp.), Corixidae (3 spp.), Cydnidae (1

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