Hosts: Horse, ass.
Location: Unknown. Oocysts found in feces.
Geographic Distribution: USSR (Azerbaidzhan, Volga basin, Leningrad).
Prevalence: Gousseff (1935) found this species in 1.4% of 3355 horses, 3% of 251 donkeys and 1% of 161 mules in Russia.
Morphology: The oocysts are spherical, bright orange to yellowish brown, and 15 to 28 u in diameter. The oocyst wall is double contoured, without a micropyle. An oocyst residuum and polar granule are absent. The sporocysts are ellipsoidal or oval, 5 by 3 u. The sporozoites are piriform. The presence or absence of a sporocyst residuum could not be determined.
Life Cycle: Unknown.