Dr. Kassai Tibor - Dr. Murai Éva szerk.: Parasitologia Hungarica 8. (Budapest, 1975)

Material and Methods After the first demonstration of K. sinensis in this country in the autumn of 1974, post mortem examination of 500 three summer carps taken from pond farms located in the catchment areas of the rivers Danube and Tisza was carried out to estimate the incidence of the parasite in Hungary. The C. fimbriceps exemplars used in the present study were preserved specimens collected earlier. The tapeworms found in the gut of the carps studied were fixed in hot formaline 5%. Some worms were used for in toto preparations, which were stained with BLACHIM carmine, HCl-carmine and haemalaun; those used for histological examination were embedded in paraffine, cut into sections in the longitudinal, sagittal and transversal planes, and were stained with haematoxylin and eosin. x Results The incidence of K. sinensis infection was found to be 35% in 300 carps taken from the ponds associated with the river Tisza, whereas among the 200 carps originating from ponds in the Danube watershed area only a single fish harboured a single Khawia parasite, A single C. fimbriceps was found in the entire group studied, although in our earlier collections this parasite had been regularly encountered in carp hosts taken of natural habitats, above all of the river Danube and Lake Balaton. Description of Caryophyllaeus fimbriceps Annenkova-Chlopina, 1919, on the basis of exemplars found in Hungary Host: Cyprinus carpio - Localization: anterior third of the gut - Intensity of infection: 1-30 parasites - Locality: river Danube. Small Caryophyllaeinae species (Fig. 1 ), measuring 15-25 mm in length and up mm in width. The scolex is slightly frilled, 1,5-1,8 by 1,2 mm in dimension. A somewhat tapering neck is present behind the scolex. The first vitellaria are 1 mm away from the scolex followed anteriorly to the first testes. Both structures localize in the medullary parenchyma (Fig. 3). The anterior four fifths of the body are filled by the vitellaria and testes which are also extending along the cirrus pouch (Fig. 4). The latter, as well as the ovary, uterus, Mehlis' gland and the postovarian vitellaria all localize in the posterior 2-3 mm long portion of the body. The excretory cariais pass in the cortical parenchyma and unite at the posterior pole of the body to from the terminal excretory bladder and excretory duct. The bladder is 150 u in diameter, the terminal excretory duct is 100 u long and 20-30 p. wide. Reproductive system. The testes are roundish bodies, 100-160 p in diameter. They localize in the medullary parenchyma and are surrounded on each side by vitellaria. The first testes are 1,5 mm away from the scolex, the last ones are found in level with the anterior half of the cirrus pouch (Fig. 4). The cirrus pouch is very large related to the body, measuring 640-840 x 400-560 p, and is surrounded by a muscular wall. The male genital pore opens into the íienítal atrium in front of the uterovaginal pore. The cirrus fills the entire space within the cirrus pouch while at rest, but extends a 400 ,u long by 80-120 u wide portion beyond the genital atrium at erection (Fig. 5). The vas deferens forms several convolutions before reaching the cirrus pouch and can further be followed Thanks are due to dr. L. BUZA and Mr. F. SZIKLAI (Central Veterinary Institute, Budapest), who kindly supplied part of the test materials, and to Mrs. Emese S. FARKAS, Mrs. Etelka P. VAJDA and Mr. M. MÁRTONKA, for the post mortem examinations and processing of the histological preparations.