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.