Caryospora biarmicusis sp.n. (Apicomplexa: Eimeriidae) infecting falcons from the genus Falco in Saudi Arabia.

The oocysts of Caryospora biarmicusis sp.n. is described from the feces of the lanner falcon, Falco biarmicus, from the falcon market in Riyadh City, Saudi Arabia. Sporulated oocysts are ovoid in shape, measuring 40.2 x 34.7 (37.5-42.4 x 32.9-35.7) microm; shape index (L/W) is 1.16 (1.08-1.31) microm. The oocyst wall is smooth and bi-layered. Micropyle and polar granule are absent, but an oocyst residuum is present. Sporocysts are spheroid, 20.1 (18.6-21.3) microm; with a smooth single-layered wall, lacking Stieda body. Sporocyst residuum is present as numerous small granules. Sporozoites are stout with a large single refractile body.