Abstract
Ostertagiinae nematodes (Nematoda: Trichostrongylidae) are important herbivores gastric parasites. Because of their confused taxonomy due to the polymorphism of some species, there are differences in the generic composition of this group when comparing traditional keys with the latest articles. In the Neotropics, only a few species of the genus Mazamastrongylus are known. Of these, Mazama…