The Mongolian gazelle (Procapra gutturosa, Bovidae) as an intermediate host of three Sarcocystis species in Mongolia.

The sarcocysts of three Sarcocystis species (Sporozoa: Coccidia: Sarcocystidae) found in the Mongolian gazelle are described using light and transmission electron microscopy. The host-parasite interface and the ultrastructure of the cyst wall are represented for the first time in the macrocysts of Sarcocystis mongolica Machul'skii, 1947, localised in connective tissue cells. The cyst wall is attributed to type 1 of the classification by Dubey et al. (1989). Two other species are described for the first time from Procapra gutturosa in Mongolia: S. sp. with hair-like villar protrusions (type 7) and S. danzani n. sp. with villar protrusions possessing a structure hitherto unknown, characterised by a hollow.