eimeria necatrix eimeria necatrix eimeria necatrix is a species of eimeria that causes very severe intestinal coccidiosis in older poultry characterized by congestion, hemorrhage, necrosis of the intestine and bloody feces. very large schizonts can be seen as white or yellow dots and oocysts can be found occasionally in the ceca. eimeria necatrix scientific classification domain: eukaryota clade: diaphoretickes clade: sar clade: alveolata phylum: apicomplexa class: conoidasida order: eucoccidiorida family: eimeriidae genus: eimeria species: e. necatrix binomial name eimeria necatrixjohnson, 1930