Redescription of Myxobolus hungaricus Jaczo, 1940 (Myxosporea : Myxobolidae), a parasite of bream (Abramis brama L.)

Myxobolus hungaricus Jaczo, 1940 forms relatively large plasmodia on the gi lls of bream (Abramis brama). The authors give a redescription of this defi ciently described parasite on the basis of spores collected from the origin al habitat, which spores are indicated as a neotype. The plasmodia of the p arasite can be found on the gills typically in the spring months, and are l ocated in the central part of the gill filaments. They start to develop in the lumen of capillaries of the secondary lamellae and remain in intralamel lar location also after they have reached the mature stage. The spores have a very characteristic shape, as on the surface of the spore valves a disti nctly emerging ridge runs parallel to the sutural line. In addition to brea ms from the typical habitat, Lake Balaton, the plasmodia of M. hungaricus c ould be detected also on breams originating from the river Danube.