Here we provide a new record of Riggia acuticaudata parasitizing the armored catfish, Ancistrus sp., from the Paraguay River basin, Brazil. On May and July 2010, 27/47 (57.4%) specimens of Ancistrus sp. collected in 2 streams at Corguinho municipality in the state of Mato Grosso do Sul, were found to be parasitized by R. acuticaudata. This is the second time R. acuticaudata has been reported parasitizing Ancistrus sp. from the Paraguay River basin. In addition, it represents an important record for the known distribution of this isopod species, which was previously known only from the type locality. We also provide information on the reproductive biology of this isopod species.
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Vol. 82 • No. 1