Abstract

The myxosporean Myxobilatus legeri (Cepede, 1905) is a common parasite of the unnary tract of cyprinid fishes living in natural waters of Hungary. The paras~te's development comprises 2 stages: (1) vegetative proliferation, which takes place intracellularly in epithelia1 cells of collecting tubules of the kidney; (2) plasmodial sporogony, which occurs in the lumen of renal tubules, ureters and urinary bladder. The development of M. legeri follows a seasonal cycle. In most fishes the intracellular trophozoites appear in epithelial cells in autumn. In early spring trophozoites enter the lumen of tubules and form plasmodia containing 1 to 3 spores. In rud Scardinius erythrophthalrnus the developmental cycle of M. legeri differs in that coelozoic developmental stages are already demonstrable in the autumn.

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