title: A new coccidian parasite (Apicomplexa: Eimeriidae) from the scimitar-horned oryx, Oryx dammah.
abstract: Oocysts of Eimeria oryxae sp. n. are described from the faeces of the scimitar-horned oryx, Oryx dammah (Cretzschmar, 1826), from Zoo Garden, Riyadh City, Saudi Arabia. Sporulated oocysts were ellipsoid in shape measuring 20.9 x 17.1 (16.7-24.2 x 15.5-20.2) microm, with smooth brownish-yellow double layered wall. Micropyle and ellipsoidal polar granules are present, but micropylar cap and oocyst residuum are absent. Sporocysts are ovoid, reaching 10.0 x 5.7 (9.2-11.0 x 5.2-6.5) microm with Stieda body and sporocyst residuum. Sporozoites are elongated, each with large and small refractile body.
authors.affiliation: Department of Zoology, College of Science, King Saud University, Riyadh, Saudi Arabia.
authors.forename: Mohamed S
authors.initials: MS
authors.lastname: Alyousif
authors.forename: Yaser R
authors.initials: YR
authors.lastname: Al-Shawa
mesh_terms: D000818:Animals; D000836:Animals, Zoo; D000866:Antelopes / Q000469:parasitology*; D003048:Coccidiosis / Q000469:parasitology / Q000662:veterinary*; D004539:Eimeria / Q000302:isolation & purification* / Q000502:physiology; D005243:Feces / Q000469:parasitology; D012529:Saudi Arabia; D013170:Spores / Q000166:cytology