The aim of this paper was to increase the knowledge of the diversity of nematodes parasites of passeriform birds in Argentina. The helminthofauna of 34 specimens belonging to 26 species of passeriform birds from Northeastern Argentina was studied. Forty-seven percent of the birds were positive for nematodes. The richness of nematode taxa in the birds studied was low (1-2 species per host) and the infection intensity was moderate (1-15). Eight taxa, that were previously known, are briefly described, and 14 host-parasite associations are reported: Acuaria cf. wangi and Acuaria sp. (Acuariidae) parasitizing Xiphocolaptes major and Tolmomyias sulphurescens, respectively; the diplotriaenids Diplotriaena americana associated with Cyanocorax chrysops and Diplotriaena bargusinica parasitizing Chrysomus ruficapillus and Agelasticus cyanopus; Aproctella cf. stoddardi (Onchocercidae) associated with Myiarchus tyrannulus, Pitangus sulphuratus, Ammodramus humeralis and Campylorhamphus trochilirostris; Skrjabinura sp. (Seuratidae) parasitizing Cyanocorax cyanomelas and C. chrysops; Microtetrameres minima (Tetrameridae) associated with Empidonomus aurantioatrocristatus and T. sulphurescens; and capillariids parasitizing Gnorimopsar chopi. These findings allowed us to make the first records in Argentina of D. americana, D. bargusinica, M. minima, and of the genera Acuaria and Aproctella. Also, 10 new host-parasite associations are reported. The host-parasite relationships are discussed through the analysis of the birds diet, environmental disturbance and the life cycle of helminths.
ARK: id.caicyt.gov.ar/ark:/s23139862/fvt6yipad