New Morphological Details and First Records of Heterakis spumosa and Syphacia muris from Argentina

ROBLES, MARÍA DEL ROSARIO; NAVONE, GRACIELA T.; GOMEZ VILLAFAÑE, ISABEL E.

COMPARATIVE PARASITOLOGY

Allen Press

Lugar: Lawrence, Kansas; Año: 2007

1525-2647

Heterakis spumosa and Syphacia muris are among the most common species parasitizing mammals. Although these nematodes have been cited for differents hosts and continents, in South America they have only been recovered from the caecum of Rattus norvegicus from Brazil and Peru. This study provides morphological details of H. spumosa and S. muris. Moreover, this is the first record of these species in Argentina. H. spumosa and S. muris were collected from specimens of R. norvegicus from Partido de Exaltación de la Cruz, Buenos Aires Province, Argentina. This note presents relevant features observed under scanning electron microscope (SEM) for H. spumosa such as the presence of 4 papillae on the lips, the lateral alae forming a cuticular fold inside a groove that is extended until the posterior end, double papillae on the tip of tail of the male, vulva with 5 cuticular processes and 2 pair of sessile papillae on the female tail. Also, S. muris shows a porous badge posteriorly to the amphids and the excretory pore located in an oval depression. In addition, it confirms the presence of these species in Argentina extending their southern distribution.