Dr. Holló Ferenc szerk.: Parasitologia Hungarica 4. (Budapest, 1971)

Parasit. Hung. 4. 121-124. 1971 Eimeria acerinae sp. n. in the Ruff (Acerina eernua) Dr. László PELLÉRDY — Dr. Kálmán MOLNÁR Veterinary Research Institute of the Hungarian Academy of Sciences, Budapest On dissection of 20 specimens of the ruff (Acerina cernua) caught in the Hungarian reach of the Danube in 1969 and 1970, we have regularly found large numbers of sporulated - and only exceptionally unsporulated - Eimeria oocysts in intestinal scrapings. As we do not know of the occurrence of any coccidia in the ruff, we consider the parasites found to he the representative of a new species, and describe it as follows. Eimeria acerinae sp.n. Oocysts round, 10-12 ÁL in diameter, cyst wall smooth, thin, single-layered, usually resting on the sporocysts, but sometimes rupturing, in which case the sporocysts occur free, lying loosely next to one another. Oocysts with an intact wall have no oocyst residuum (Pig. l). In some cases the oocysts occur free in the intestinal lumen, at other times in smaller groups conglomerated in the remnants of the yellow body. Unsporulated oocysts are still attached to of the destroyed host cell, whose flattened nucleus may occasionally be observed. The sporocysts are more or less coffee-bean-shaped. Prom certain angles they appear oval, laterally, however, one side is convex in outline,the other nearly flat. Sporocysts dimensionsi 8-8.5 X 5-5.5yu, (Pig. 2).