Previous paleoparasitological studies were developed in Alero Mazquiarán an archaeological site located in the south of Chubut Province, Argentina. In those studies, coprolites from Cricetidae rodents (don’t identified) were examined and three species of parasites were found (Pterygodermatites spp., Trichosomoides crassicauda and Monoecocestus spp.). Among these parasites, the trichosomoidids are zoonotic nematodes and, in this sense, the paleoparasitological studies will allow to understand the distribution of parasites in time and space. Currently, new parasitological studies in sigmodontine rodents are being carried out in Santa Cruz Province, in an area near to that mentioned archaeological site. In this context, it is interesting to contrast the previously obtained results with the new information presented in the current study, to contributing to the interpretation of epidemiological models. This paper reexamines the identity of a nematode assigned to the family Trichosomoididae using morphological and molecular studies.

Fil: Robles, María del Rosario. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Estudios Parasitológicos y de Vectores. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Centro de Estudios Parasitológicos y de Vectores; Argentina

Fil: Fugassa, Martín Horacio. Universidad Nacional de Mar del Plata; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata; Argentina

Fil: Petrigh, Romina Sandra. Universidad Nacional de Mar del Plata; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Mar del Plata; Argentina