Host: Domestic rabbit.
Location: Primarily ileum.
Geographic Distribution: Japan.
Morphology: The oocysts are broadly ovoid, 22 to 29 by 16 to 22 u with a mean of 25 by 18 u. A micropyle is present. An oocyst residuum is present. The presence or absence of an oocyst polar granule and a sporocyst residuum are unknown. The sporulation time is 1.5 to 2 days.
Life Cycle: Unknown.
Pathogenesis: According to Tsunoda (1952), this species may be slightly to moderately pathogenic, causing a diphtheritic enteritis.