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Most species occur in avian or rodent hosts.
In the latter genus a definate oocyst wall occurs whereas in the former no discernible oocysts are produced. The validity of all members of the genus Dorisa is questionable. Some species appear to represent isosporan oocysts that failed to sporulate properly, whereas for others it seems the authors may have simply mistook the refractile bodies for sporozoites. All indications are that conditions were insufficient for proper sporulation. Thus, the oocysts with 6 or 8 sporozoites represent isosporan oocysts that failed to sporulate properly.