Nippostrongylinae

Guillermo Panisse, María Del Rosario Robles, María Celina Digiani, Juliana Notarnicola, Carlos Galliari & Graciela Teresa Navone, 2017, Description of the helminth communities of sympatric rodents (Muroidea: Cricetidae) from the Atlantic Forest in northeastern Argentina, Zootaxa 4337 (2), pp. 243-262 : 254

Nippostrongylinae sp. (2)

Site of infection. small intestine

Collection number. MLP-He7342

Host species. Euryoryzomys russatus . CG563

Localities. CAMB, RVSU and PPU

Comments. Main characteristics of the Nippostrongylinae were mentioned above. However, these specimens could also be attributed to the Nippostrongylinae and remain under study, though they could not be assigned to any known genus in the subfamily mainly because of having a synlophe with unequal ridges and the largest of them being associated with the lateral fields rather than with the left-ventral and right-dorsal quadrants. This character makes them similar to the species Malvinema carolinae Digiani, Sutton & Durette-Desset, 2003 , parasitic in Scapteromys aquaticus Thomas, 1920 (Sigmodontinae) . However, Nippostrongylinae specimens show some differences regarding the synlophe compared to that of M. carolinae , namely, the number of ridges and, especially, the inclination of the orientation axis of the ridges with respect to the sagittal axis (see Digiani et. al 2003). The largest ridges associated with the lateral fields is a character of M. carolinae but this is not present in rest of the species of the genus Malvinema Digiani, Sutton & Durette-Desset, 2003 . Consequently, its value as a specific or generic character remains to be assessed for taxon description.

This is the first record of Nippostrongylinae in E. russatus for Argentina together with S. lanfrediae , Stilestrongylus n. sp. (2) and G. ulysi (see above).