Choleoeimeria riyadhae sp.n. (Apicomplexa: Eimeriidae) from the lizard,Scincus scincus (Sauria: Scincidae) in Saudi Arabia.

Choleoeimeria riyadhae species new was described from the gall bladder of the lizard,scincus scincus (sauria: scincidae) collected from east of riyadh city,central region. sporulated oocysts are broadly ellipsoid,36.8 x 30.5 (33.4-39.1 x 28.7-32.5) microm,with a smooth,brownish-yellow bilayered wall; the shape index (l/w) is 1.21 (1.19-1.23) microm. micropyle,polar granule and oocyst residuum are absent. sporocysts are elongate-ellipsoid,14.8 x 9.1 (13.7-15.5 x 8.1-10.4) microm with shape index (l/w),1.63 (1.52-1.74) microm. sporocyst residuum is present. the sporocysts lack a stieda body. sporozoites are banana-shaped blunt at one end and slightly tapered at the other. sometimes,free sporozoites were seen within oocysts.