In Argentina, there is one record of the nematode Trichuris dolichotis Morini, Boero & Rodriguez, 1955 (Nematoda: Trichuridae) parasitizing the mara Dolichotis patagonum (Zimmermann, 1780), which corresponds to its original description in 1955. In June 2023, at the Wildlife Rehabilitation Center, San Juan province, a specimen of mara male D. patagonum died and the necropsy´s results are under investigation at the moment. The post-mortem identified (n= 5) female nematodes of T. dolichotis in the intestine. In the present study we present the second record after 58 years of not reporting its presence, being the first record for the province of San Juan and the second for Argentina. The present work contributes to the knowledge of the mammalian parasite fauna of Argentina.

We describe a new species of Labiduris (Thapar, 1925) (Cosmocercoidea: Atractidae) collected from the long intestine of the land turtle Chelonoidis chilensis Gray 1870 in Argentina. Labiduris argentinensis sp. nov. differs from Labiduris gulosa (Rudolphi, 1819) (the only valid species of the genus), by the type and geographic distribution of the host, position of the excretory pore, body size and tail of the male and female nematodes. The new species has an excretory pore at the level of the middle widening of the esophagus, smaller body size, short and truncated tail, and is found in a terrestrial turtle with restricted distribution in Argentina. These characteristics of the new species are different from those of L. gulosa, which has an excretory pore in front of the bulb and a long, pointed tail and a larger body. The new species L. argentinensis sp. nov. represents the second valid s...