الفهرس 
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Abstract
Sarcocysts of Sarcocystis spp. infecting the skinks Scincus scincus conirostris (Blanford, 1881) and Eumeces schneideri schneideri (Daudin, 1802) were investigated by light and transmission electron microscopy. Five out of 75 (6.7%) Scincus scincus conirostris and five out of 80 (6.25) Eumeces schneideri schneideri were found infected with Sarcocystis. Examined muscle samples of different sites showed a high intensity of infection in the tail and hind limb skeletal muscles. Microscopically, visible cysts reached a mean size of 200 x 90 µm in Scincus scincus conirostris and 575 x 75 µm in Eumeces schneideri schneideri. These cysts were characterized by a light microscopically thin cyst wall and inner prominent septa dividing their interior into a large number of compartments enclosing the different zoites. Ultrastructural level, a thin primary cyst wall measured about 0.21 µm in Scincus scincus conirostris, while it was 0.28 µm in Eumeces schneideri schneideri. At the same time, secondary cyst wall was recorded in both skinks. Two widely differentiated zoites (metrocytes and cyst merozoites) were clearly identified; they all showed the characteristic architecture of Apicomplexa and especially that of genus Sarcocystis. The mean 6 x 1.5 µm sized for Scincus scincus conirostris and the mean 4 x 2 µm for Eumeces schneideri schneideri cyst merozoites seemed to be differentiated into those being either poorly or richly supplied with reserve materials (amylopectin, lipids). This finding may indicate the existence of different developmental stages. Events of endodyogeny represented the only mode of asexual reproduction inside the cysts of both skinks