Cheiropteronema striatum sp. nov. is a parasite of the bat Artibeus planirostris (Spix, 1823). This species is characterized by cephalic vesicle striate, thick egg shell punctate, spicules equal, symmetrical development of spicule wings, particular arrangement and number the ridges of synlophe, and lack of esophageal tooth. Cheiropteronema striatum sp. nov. is the second species described for the genus and the first recorded in frugivorous bats of Argentina.

Se describe a Cheiropteronema striatum sp. nov. parásita del murciélago Artibeus planirostris (Spix, 1823). Se caracteriza por presentar vesícula cefálica estriada, superficie de los huevos con puntuaciones, espículas iguales, nacimiento simétrico del ala espicular, particular disposición y número de crestas del synlophe y por carecer de diente esofágico. Es la segunda especie del género y la primera que se registra en quirópteros frugívoros de la Argentina.

Pterigodermatites (Paucipectines) (Nematoda: Rictulariidae) includes five parasites species from edentates, marsupials, and cricetid rodents. In this paper Pterigodermatites (Paucipectines) kozeki (Chabaud and Bain, 1981) Navone, 1989, is recorded from Thylamys pallidior and Thylamys venustus collected in Salta and Jujuy, also representing the first citation for those provinces of Argentina.

Pterigodermatites (Paucipectines) (Nematoda: Rictulariidae) incluye cinco especies parásitas de edentados, marsupiales y roedores cricétidos. En esta nota se registra por primera vez a Pterigodermatites (Paucipectines) kozeki (Chabaud y Bain, 1981) Navone, 1989, como parásito de Thylamys pallidior y Thylamys venustus en las provincias de Salta y Jujuy (Argentina).

The presence of the nematode Spinitectus jamundensis in cardial and pyloric regions of the stomach of Prochilodus lineatus is observed. Samples of the parasitated stomach were analyzed by histological techniques using Hematoxilin-Eosin and Mallory (Azan) Heidenhain's stainnigs. The macroscopical description of the inner surface of the stomach showing damages in the parasites penetration sites, were observed. Histological observations show that the parasite enters the mucous membrane reaching muscular mucous membrane of the cardial region or the epithelial plaits in the pyloric region reaching up to the muscular layer without crossing it. In this way, the parasite reamins confined by a thin layer of connective tissue and in almost direct contact with tissue liquids. Sometimes, in host tissues as responde to the parasite presence, an increased level in the amount of lymphocytes in the surrounding tissues is observed.