No sporozoites are formed in the oocyst, the sporozoites being unenclosed (gymnospores).
Immediately after the formation of the antheridia new productions show themselves, both around the oocyst and within it.
In one case (Coccidium mitrarium), the oocyst itself, instead of being spherical, is curiously shaped like a mitre.
The order Coccidiidea is divided into four families, characterized by the number of sporocysts (if any) found in the oocyst.
oocyst o·o·cyst (ō'ə-sĭst')
A thick-walled structure in which sporozoan zygotes develop and that serves to transfer them to new hosts.