Oligacanthorhynchus major (Machado-Filho, 1963) Schmidt, 1972 (Acanthocephala: Oligacanthorhynchidae) was redescribed using specimens from 2 white-lipped peccaries (Tayassu pecari) collected in the department of Santa Cruz, Bolivia. The male and the egg of O. major were described for the first time. The female worm is 241-824 mm long; the trunk is narrowest at the anterior end and widest in the middle of the worm. The male worm (120 mm) is substantially smaller than the female, the testes are confined to the posterior region, and an instance of monorchism is documented for a member of this species.
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