The acuarioid nematode <i>Echinuria skrjabiniensis</i> Efimov in Skryabin, Sobolev et Ivashkin, 1965 was found in <i>Calidris bairdii</i> and <i>C. fuscicollis</i> (Aves, Scolopacidae) examined from several locations from Patagonia, Argentina. These constitute new host records as well as the first record of this parasite species in South America. Using both light and scanning electron microscopies, new morphological details are provided, including the description of the left spicule and the number and the arrangement of male caudal papillae. The taxonomic history of the species is summarized, corroborating its correct spelling and valid name.Centro de Estudios Parasitológicos y de VectoresFacultad de Ciencias Naturales y Museo