A new species of Parspina Pearse, 1920 (Digenea: Cryptogonimidae) from Pimelodella gracilis (Valenciennes) (Siluriformes: Heptapteridae) in the Parana River basin, Argentina, and a key to the genus. Systematic Parasitology, 84(1), Jan 2013: 81-87. 82 [Zoological Record Volume 149]