Host: Wild mallard (Anas platyrhynchos). Scholtyseck did not find this species in 6 domestic ducks, which he called A. domestica.
Location: Small intestine.
Geographic Distribution: Europe (Germany).
Prevalence: Scholtyseck (1955) found this species in 5 of 32 wild mallards.
Morphology: The oocysts are ovoid, 14 to 19 by 11 to 16 u with a mean of 17 by 14 u. The oocyst wall is smooth, about 0.7 to 1.0 u thick, with a thickened ring forming shoulders around the micropyle. An oocyst residuum and polar granule are absent. The sporocysts are elongate ovoid or ellipsoidal, with a slight thickening at the small end but not a true Stieda body. A few sporocyst residual granules are present between the sporozoites.
Life Cycle: Unknown.
Remarks: Tiboldy (1933) reported Eimeria sp. oocysts in domestic ducks in Hungary. They were ovoid, elongate ovoid or occasionally spherical are measured 11 to 25 by 8 to 13 u. Their relationship to E. anatis is unknown.