This study reports on infection by Prosthernorchis elegans of Callithrix aurita and Leonthopithecus rosalia through biometry on adults and by molecular biology. Seventy-eight helminths were recovered from the animals' intestine. This is a detailed morphological description and the first molecular characterization of P. elegans in animals from Brazil.
Keywords: acanthocephala; molecular analysis; morphology; neotropical primates.
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