A knob-like Stieda body and relatively large, oval, homogenous substieda body are present. Sporozoites are elongate, distinctly transversally striated. Oocysts of Isospora oudrii sp. A micropyle, oocyst residuum and polar granule are absent. A knob like Stieda body and oval substieda body present.
Sporozoites are vermiform, lying parallel within the sporocyst.