Henneguya amazonica n.sp. (Myxozoa, Myxobolidae), parasitizing the gills of Crenicichla lepidota Heckel, 1840 (Teleostei, Cichlidae) from Amazon river.

The authors present light and electron microscopical data on a myxosporidian found in the gills of Crenicichla lepidota Heckel, 1840 (Teleostei, Cichlidae) from the Amazon river. Based on the spore morphology, it is concluded that this species belongs to the family Myxobolidae, genus Henneguya, and that it constitutes a new species: Henneguya amazonica n.sp. The fine structure of sporogenesis shows that the development follows, in general, the pattern of this and other genera. Nevertheless, some ultrastructural features are reported for the first time in the genus Henneguya: intercellular bridges between daughter generative cells as well as tubuli arranged in aggregates and dispersed within the capsular matrix. The structure of the trophozoite wall suggests that the species is not highly pathogenic, but, to ascertain the true pathogenicity of the species, further studies are needed.