| a new species of henneguya, a gill parasite of astyanax altiparanae (pisces: characidae) from brazil, with comments on histopathology and seasonality. | a new species of myxosporea, henneguya chydadea, is described parasitizing the gills of astyanax altiparanae collected from a lake on rio das pedras farm near campinas, state of são paulo, brazil. of the fish examined, 88.3% had gills parasitized by myxosporeans. the prevalence of the parasite ranged from 80% in the spring and fall, 93% in the summer and 100% in the winter. the parasite induced the formation of white, oval-shaped cysts measuring 40-64 microm x 64-80 microm which deformed the gil ... | 2003 | 14595452 |