Description of oocyst, sporocysts, sporozoites: See Callithrix (Fam. Callitrichidae [Primates-Marmosets]).

Remarks: Poelma (1966) mentioned that some oocysts resembling I. arctopitheci were seen in 1/3 (33%) G. senegalensis that had died at the Amsterdam Zoo the day after its arrival from Africa.

Reference: Poelma (1966).