''Eimeria couesii'' is an apicomplexan

parasite Parasitism is a close relationship between species, where one organism, the parasite, lives on or inside another organism, the host, causing it some harm, and is adapted structurally to this way of life. The entomologist E. O. Wilson has ...

of the genus '' Eimeria'' that infects the

intestine The gastrointestinal tract (GI tract, digestive tract, alimentary canal) is the tract or passageway of the digestive system that leads from the mouth to the anus. The GI tract contains all the major organs of the digestive system, in humans ...

of the

rice rat Oryzomyini is a tribe of rodents in the subfamily Sigmodontinae of the family Cricetidae. It includes about 120 species in about thirty genera,Weksler et al., 2006, table 1 distributed from the eastern United States to the southernmost parts of S ...

Oryzomys couesi ''Oryzomys couesi'', also known as Coues's rice rat, is a semiaquatic rodent in the family Cricetidae occurring from southernmost Texas through Mexico and Central America into northwestern Colombia. It is usually found in wet habitats, such as m ...

'' in Mexico. It has an oocyst residuum and Stieda bodies, structures that are absent in some other ''Eimeria''.Barnard et al., 1974, p. 410

References

Literature cited

*Barnard, W.P., Ernst, J.V. and Stevens, R.O. 1971
''Eimeria palustris'' sp. n. and ''Isospora hammondi'' sp. n. (Coccidia: Eimeriidae) from the marsh rice rat, ''Oryzomys palustris'' (Harlan)
(subscription required). The Journal of Parasitology 57(6):1293–1296. *Barnard, W.P., Ernst, J.V. and Dixon, C.F. 1974
Coccidia of the cotton rat, ''Sigmodon hispidus'', from Alabama
(subscription required). The Journal of Parasitology 60(3):406–414. *Kruidenier, F.J., Levine, N.D. and Ivens, V. 1960. ''Eimeria'' (Protozoa: Eimeriidae) from the rice rat and pygmy mouse in Mexico. Transactions of the Illinois Academy of Sciences 52:100–101. {{taxonbar, from=Q5349559 Conoidasida