Dr. Murai Éva szerk.: Parasitologia Hungarica 11. (Budapest, 1978)

Eirneria nemethi sp. n. (Fig. 5) Diagnosis. - Oocyst ellipsoid, 18. 4 (17.0-20. 2) long and 12.5 (11. 5-13. 5) wide. Cyst wall smooth, colorless, composed of a single thin layer (~0. 1). Sporocysts moderately compact. Oocyst residuum, micropyle and polar granule absent. Sporocyst oval, measuring 12 (11.4-12.6) x 4. 4 (4.1-3. 9). Disc-like Stieda body, 0. 3 thick and 3. 7 (3. 5-4. 0) in diameter at its tapered end. Sporocyst wall 0.2 thick. Four sporocyst arranged lengthwise, but not always the same direction in the oocyst. Each sporocyst carries two vermiform sporozoites arranged head to tail, is slightly bent at one end, with a refractile globule in the bent portion. Measurements of sporozoites 7.2 (6.9-7.5) x 2. 3 (2.1-2.5). Sporocyst residuum dispersed, consists of 2 or 3 coarse granules. Sporulation of the oocyst was completed in the inner organs of the host. Host: Alburnus alburnus. - Locality: draining canal near to Lake Velencei. - Location in the host: parenchyme of spleen, liver and kidney. - Host/Infection ratio: l/l. Remarks: Eimeria nemethi resembles Eimeria rutili Dogiel et Bychowsky, 1938 and Eimeria esoci Schulman et Zaika, 1962, but differs from them by shape of Stieda body and size at the oocyst, respectively. This species is named after Dr. István NÉMETH, parasitologist in this Institute. Eimeria sp. One of the four examined Misgurnus fossilis fish harboured in the gallbladder, in its bilious content round, granular, oocyst-like bodies, 15-16 in diameter (Fig. 6A). Bodies in every respect similar to these, but considerably less numerous, were also encountered in the intestinal content. On 24hr incubation in tap water, part of the bodies developed to oocysts 22-24 in diameter, each enclosing a finely granulated sporont, 18 in diameter, centrally placed and separated by a broad space from the 0.1 thick cyst wall (Fig. 6B). After another 24 hr, some oocysts began to sporulate; in each of these arose 4 spherical sporoblasts, about 9 in diameter (Fig. 6C). Fig. 6: Eimeria sp. A = Oocysts found in the gallbladder; B = Oocysts incubated in tap water for 24 hr; C = Oocysts enclosing developing sporoblasts Death of the oocysts at this stage unfortunately prevented the further observation of sporulation; hence the lack of information on sporocyst structure. Oocysts gaining free access to the intestine in the gallbladder content are presumably passed unsporulated; it follows that although most Eimerian parasites of fish undergo sporulation in the host, some species might complete development in the outside world. In addition to the morphologically well defineable oocysts described in the foregoing, the examined fish hosts harboured several other types of oocysts which corresponded with, or at least had no differentiating feature from the fish coccidia found earlier in Hungary. Part of these types occurred in phylogenetically so distant hosts that little doubt has been left to