THE TELOSPORASIDA AND THE COCCIDIA PROPER 



235 



Prevention and Control : The same 

 measures used to control coccidiosis in 

 chickens are effective against the disease 

 in pigeons. General sanitation and dry 

 quarters are especially important. 



EIMERIA COLUMBAE 



MITRA AND DAS GUPTA, 1937 



Host : Indian pigeon {Columba livia 

 intermedia). 



Location: Intestine. 



Geographic Distribution : India. 



Prevalence : Unknown. 



Morphology : The oocysts of this 

 species have not been completely des- 

 cribed. They are subspherical, have a 

 maximum size of 16 by 14 /j, and differ 

 from E. labbeana in having an oocyst 

 residuum, according to Mitra and Das 

 Gupta (1937). 



Life Cycle : Unknown. 



Pathogenesis: Unknown. 



Genus ISOSPORA Schneider, 1881 



In this genus the oocyst contains 2 

 sporocysts, each of which contains 4 

 sporozoites. 



ISOSPORA AKSAICA 

 BASANOV, 1952 



Host : Ox. 



Location : Unknown. Oocysts found 

 in feces. 



Geographic Distribution : USSR 

 (Kazakhstan). 



Prevalence : Unknown. This species 

 was found only in calves 12 to 30 days old. 



Morphology : The oocysts are 26 ii in 

 diameter, spherical, dark silver under 



low magnification and light, pinkish grey 

 under high. The oocyst wall is 1.6^ thick, 

 smooth and double -contoured, with a light 

 blue outer layer and a greenish, dingy 

 rose inner layer. The sporocysts are el- 

 lipsoidal or spherical, 22 by 15 /i. Micro- 

 pyle, oocyst residuum and sporocyst resi- 

 duum are presumably absent. Polar 

 granules are possibly present. The sporo- 

 zoites are spherical, bean-shaped or 

 ellipsoidal, 1 5 by 1 1 jj, . 



Life Cycle : Unknown. 



Pathogenesis : Unknown. 



Remarks : There is a question 

 whether this is actually a valid species of 

 bovine coccidium or whether it is a pseudo- 

 parasite, i.e., an avian or other foreign 

 coccidium which the cattle had ingested 

 along with its host's feces. Further work 

 will be necessary to decide this point. 

 The subjacent discussion of the Isospora 

 species found by Levine and Mohan (1960) 

 in cattle has a bearing on /. aksaica also. 



ISOSPORA sp. 



LEVINE AND MOHAN, 1960 



Hosts : Ox and ox-zebu hybrids. 



Location : Unknown. Oocysts found 

 in feces. 



Geographic Distribution : 

 America (Illinois). 



North 



Prevalence : Levine and Mohan (1960) 

 found this form in 6 out of 54 beef cattle 

 on 3 farms in central Illinois. 



Morphology : The oocysts are usually 

 subspherical, occasionally spherical, 21 

 to 33 by 20 to 32 ^ with a mean of 27 by 

 25 ji. The oocyst wall is smooth, color- 

 less, pale lavender or pale yellowish, 

 composed of a single layer about 1 ji thick. 

 In some oocysts, the wall appeared to be 

 lined by a thin membrane. A micropyle 

 and oocyst residuum are absent. Several 

 oocyst polar granules are present. The 

 sporocysts are lemon-shaped, quite thick- 

 walled, 14 to 20 by 10 to 12 ^x with a mean 



