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Chaetophractus villosus  and  Dasypus hybridus  are the most widespread and abundant armadillos inhabiting the Pampas grasslands. Studies on the parasitic fauna from an ecological perspective are scarce in both species. We describe and compare the component communities of  C. villosus  and  D. hybridus  in the Pampas ecoregion of Argentina and analyse if the composition and structure of the parasitic communities of these host species reveal trophic behaviour and/or habitat use. In the population of  C. villosus  10 species of helminths were found, namely  Ancylostoma caninum ,  Aspidodera fasciata ,  Aspidodera scoleciformis ,  Mazzia bialata ,  Moennigia celinae ,  Orihelia anticlava ,  Strongyloides  sp.,  Trichohelix tuberculata  (Nematoda) and  Mathevotaenia  sp. (Cestoda), whereas in the population of  D. hybridus  four species were found,  A. fasciata ,  Delicata abbai ,  Pterygodermatites chaetophracti  and  Strongyloides  sp. Only  A. fasciata  and  Strongyloides  sp. were present in both species. Prevalences and intensities were similar in  Strongyloides  sp. In  A. fasciata , however, there were differences regarding mean intensity. Diversity was higher in  C. villosus  than in  D. hybridus.  The differences may be related to the diet, behaviour, evolutionary histories or immune response of the species studied. A combination of several of these factors would possibly influence the composition of their parasitic fauna.

Comparative analysis of the helminth fauna of Dasypus hybridus and Chaetophractus villosus (Xenarthra: Cingulata) in the Pampas region, Argentina