Ultrastructure and phylogeny of Thelohanellussp. (Myxozoa: Myxosporea) infecting the gills ofHypophthalmus marginatus(Actinopterygii: Pimelodidae), a fish from the Amazon River. (10th September 2015) - Rocha, S.; Matos, E.; Velasco, M.; Casal, G.; Alves, A.; Azevedo, C.