Helmintofauna del roedor Abrothrix olivaceus (Sigmodontinae) en áreas sub-urbanas de Santiago de Chile

the wild rodent, abrothrix olivaceus, is a widespread species in chile using different habitats troughout the territory. its helminthfauna has been partially studied in wild enviroments in chile. in this work five nematodes and one species ofcestode were found. three of them are first record in this host: syphacia obvelata, physaloptera calnuensis and heterakis spumosa, and this last one, is first record in chile. it is suggested that one structuring factor is the locality: one of the three localities studied had more mean abundance and prevalence in two parasites species and as a component community. it is also suggested that other structuring factor of this helminth community is the introduction of parasites from foreign species. this is the first study of its helminthes in sub-urban localities and in the región metropolitana.