Dr. Murai Éva szerk.: Parasitologia Hungarica 19. (Budapest, 1986)

among the degenerating cells there always are Hoferellus trophozoites that had stuck there. Actually, the formation of the connective-tissue capsule is part of the host's regeneration after a passed-off infection, when parasite development continues in a coelozoic manner in the ureters where H. cyprini spores are formed in the spring. AHMED (1973) and HOFFMANN (1984) studied the development of Mitraspora cyprini

, a species considered by us a synonym of H. cyprini

, thoroughly. However, they did not report the formation of foci surrounded by connective tissue. At the same time, LOM and DYKOVÁ (1984) are of the opinion that at the end of Hoferellus infection a granulomatous inflammation develops, and the necrotic foci become surrounded by fibrocytes. Our opinion differs from that of the above authors in two different respects. LOM and DYKOVÁ (1984) assume that the trophozoites are released into the interstitium after the disruption of the basement membrane, while our results prove that they get into the lumen of the tubules. As opposed to LOM and DYKOVÁ (1984), we failed to find an inflammatory response after the disruption of the Hoferellus nodule. At the site of infection degenerative processes, followed by regeneration by connective tissue, took place. Lymphocytes and granulocytes were not typical, whereas the appearance of macrophages and fibroblasts was considered by us a sign of restitution. MOLNÁR, K. — KOVÁCS-GAYER, É.: Megfigyelések a Hoferellus cyprini (Doflein, 1898) (Myxosporea, Myxozoa) intracelluláris és coelozoicus fejlődési stádiumaira vonatkozóan A szerzők a Hoferellus cyprini (Doflein, 1898) intracelluláris fejlődési stádiumainak a vesecsatornák lumenébe való kiürülését követték nyomon szövettani módszerrel. A Hoferellus c

yprini trophozoitái, melyek az őszi hónapok során a vesecsatornák egy adott szakaszán a vesehámsejteket sejtsyncytiummá alakítják, januárban a syncytium degenerálódása és szétesése után a tubulusok üregébe kerülnek, coelozoicus fejlődési stádiumokká alakulnak és az uréterben telepednek meg. A csatorna hámjának szétesése után az épen maradt alaphártya felől a lumenbe fibrocyták és macrophagok hatolnak be és a sejttörmeléket, valamint az ott rekedt trophozoitákat többrétegű kötöszövetes tokkal veszik körül. REFERENCES AHMED, A. T. A. (1973): Morphology and life history of Mitraspora cyprini Fujita, parasitic in the kidney of gold fish. - Japan. J. Med. Sei. Biol., 26: 87-101. DYKOVÁ, I., - LOM, J. and GRUPCHEVA, G. (1983): Do organisms from carp kidney classified as "Hoferellus cyprini" constitute a real Myxosporean species? - J. Protozool, 30: 28A. FUJITA, T. (1912): Notes on new Sporozoan parasites of fishes. - Zool. Anz., 39: 251-261. HOFFMANN, G. L. (1984): Two fish pathogens, Parvicapsula sp. and Mitraspora cyprini (Myxosporea) new to North America. - Symposia Biologica Hungarica, 2_3: 127-135. LOM, J. and DYKOVÁ, I. (1984): Pathogenecity of some protozoan parasites of cyprinid fishes. - Symposia Biologica Hungarica, ^3: 99-118. LOM, J. and DYKOVÁ, I. (1985): Hoferellus cyprini Doflein, 1898 from carp kidney: a well established myxosporean species or a sequence in the developmental cycle of Sphaerospöra renicola Dyková and Lom, 1982? - Protistologica, 21: 195-206. MOLNÁR, K.- CSABA, G. and KOVÁCS-GAYER, Éva (1986): Study on the postulated identity of Hoferellus cyprini (Doflein, 1898) and Mitraspora cyprini Fujita, 1912 . - Acta vet. hung., 34 : 175-181. Received: 18 April, 1986 Dr. MOLNÁR, K. Dr. KOVÁCS-GAYER', Éva Veterinary Medical Research Institute, Central Veterinary Institute, Hungarian Academy of Sciences, H-1581 Budapest, 146, H-1581 Budapest, P.O. Box 18, P.O. Box 2, HUNGARY HUNGARY