Neotropical Monogenoidea 37. Redescription of Gyrodactylus superbus (Szidat, 1973) comb. n. and description of two new species of Gyrodactylus (Gyrodactylidea: Gyrodactylidae) from Corydoras paleatus and C. ehrhardti (Teleostei: Siluriformes: Callichthyidae) of southern Brazil. Folia Parasitologica (Ceske Budejovice), 47(2) 2000: 105-110. 109 [Zoological Record Volume 136]