A new species of Kritskyia
inhabits the urinary bladder of the "curimba", Prochilodus lineatus
in the floodplain of the high Paraná river. The new species resembles others members of Kritskyia
in the following features: haptor lacking anchors and with 14 hooks marginal, posterior male copulatory organ non articulated with the accessory piece and vagina a sclerotized tube. However, it differs from the known species mainly by the shape of the copulatory complex. This is the third endoparasitic monogenean species reported from freshwater Neotropical fish.