Observations on Eimeria species of Dasyprocta leporina (Linnaeus, 1758)(Rodentia: Dasyproctidae) from the state of Pará, North Brazil

redescriptions are given of the mature oocysts of eimeria aguti carini 1935, e. cotiae carini, 1935 and e. paraensis carini, 1935, in the faeces of five specimens of the rodent dasyprocta leporina (rodentia: dasyproctidae) from the state of pará, north brazil. new information is provided on the sporulation time of these parasites and the prepatent period in experimentally infected d. leporina. some endogenous stages of e. cotiae are described in the epithelial cells of the ileum, and the absence of any oocysts in the gall-bladder contents of the infected animals indicates that the intestine is also the site of development of e. aguti and e. paraensis. difficulties in separating e. cotiae and e. paraensis on morphology of the oocysts are discussed. the oocysts of both parasites share many structural features and have a wide size range. it is concluded that although it is at present best to maintain these names, the possibility exists that they were separately given to oocysts of smaller dimensions (e. cotiae) and larger dimensions (e. paraensis) of a single parasite. location of an endogenous site of development for e. paraensis that is distinctly separate from that of e. cotiae might establish more definitely the separate specific status of the two parasites.