eimeria nieschulzi eimeria nieschulzi eimeria nieschulzi is an apicomplexan parasite of the genus eimeria that infects the brown rat (rattus norvegicus). eimeria nieschulzi scientific classification domain: eukaryota clade: diaphoretickes clade: sar clade: alveolata phylum: apicomplexa class: conoidasida order: eucoccidiorida family: eimeriidae genus: eimeria species: e. nieschulzi binomial name eimeria nieschulzidieben,1924