Trichuris spp. Roederer, 1761 was collected for the first time in wild capybaras (Hydrochoerus hydrochaeris) living in afarm area in the "Swamp region of Taim ", county of Rio Grande, State of Rio Grande do Sul, Brazil. Two morphological distincts species were observed. A total of 439 specimes of this nematode were found in 12 of 24 examined animals, the mean intensity and abundance found were 36.58 and 18.29 respectively. The intensity found ranged from two to 249 specimes per host infected. The mean intensity of infection showed values significantlly different betwen young and adults animals, with higher values in youngs animals. This capybaras constitute a new host to this genus of nematoda.
Hydrochoerus hydrochaeris; Trichuris; capybara; nematoda; rodents; wild animals