Neotropical Monogenoidea. 20. Two new species of oviparous Gyrodactylidea (Polyonchoinea) from loricariid catfishes (Siluriformes) in Brazil and the phylogenetic status of Ooegyrodactylidae Harris 1983. Journal of the Helminthological Society of Washington, 61(1), January 1994: 34-44. 36 [Zoological Record Volume 131]