Spasskyellina mandi n. sp. (Proteocephalidea: Monticelliidae), parasite of Pimelodus ornatus Kner, 1857 (Pisces: Pimelodidae) of the Paraná River, Paraná, Brazil

spasskyellina mandi n. sp. (proteocephalidea: monticelliidae) is described from the siluriform fish pimelodus ornatus kner, 1857, caught in the paraná river, paraná, brazil. the new species differs from other species of the same genus mainly by a fewer number of testes and by a larger osmoregulatory canal. this is the second species of proteocephalidean cestode collected in p. ornatus.