Host: Domestic rabbit.
Location: Posterior ileum, cecum.
Geographic Distribution: Europe (Hungary), USSR.
Prevalence: This species is apparently rare in captive domestic rabbits, but is common in wild ones.
Morphology: The oocysts are ovoid, sometimes ellipsoidal, smooth, light yellow, 25 to 40 by 15 to 21 u. A micropyle is present. An oocyst polar granule is absent. Oocyst and sporocyst residua are present. The sporulation time is 3 days.
Life Cycle: Kheisin (1947) described the life cycle of this species. The schizonts are found in the epithelial cells of the villi of the posterior ileum, and the gametes and gametocytes are below the host cell nuclei of the crypt cells of the cecum. The prepatent period is 9 days, and 100,000 oocysts are produced per oocyst fed.
Pathogenesis: According to Kheisin (1947), this species is slightly if at all pathogenic. He saw small white spots in the cecum which were groups of developing oocysts.