CONICET | Buscador de Institutos y Recursos Humanos

In the Argentinean Gran Chaco, numerous investigations have dealt with the diversity of vertebrates,including amphibians and reptiles. The parasitofauna of these organisms, has beenmore studied in some groups such as amphibians; however, from a biogeographic perspective,most of these studies were carried out in the Humid Chaco. The goal of this work is to presentthe nematofauna found in six species of amphibians, Rhinella diptycha, Chacophrys pierottii,Ceratophrys cranwelli, Scinax nasicus, Leptodactylus bufonius, and Odontophrynus lavillai,collected in different locations within the Dry Chaco, in the department of Matacos, Formosa,Argentina. In a total of 34 amphibians analyzed, we found 1,526 parasitic nematodes (totalprevalence: 61.7%; total mean intensity: 72.6±90.3; total mean abundance: 44.9±78.9), belongingto 9 taxa: adults of Rhabdias sp., Oswaldocruzia sp., O. subauricularis, Schulzia travassosi,Aplectana hylambatis, Cosmocerca podicipinus, Oxyascaris caudacutus, Schrankiana formosula,and larvae of Physaloptera sp. These nematodes were collected from the lungs, small intestine,large intestine, gastric mucosa, and gallbladder of hosts. This work is the first record of helminthsfrom C. pierottii and O. lavillai and the first record of nematodes from Ce. cranwelli throughoutits geographical range. The species Schrankiana formosula (Atractidae) is recorded for the firsttime in Argentinean amphibians. Thus, we expand the knowledge of the biological diversity ofhelminth parasites of amphibians from the Dry Chaco ecoregion. This base-line information,would allow to understand the factors that influence the patterns of host and geographic distributionof vertebrate parasites in an area with extreme characteristics such as the Dry Chaco