HAKMOSPORIDIA 025 



Species of Babesia occur also in sheep, goats, pigs and horses. 



Genus Theileria Bettencourt, Franga and Borges. Schizogony 

 takes place in endothelial cells of capillaries of viscera of mammals; 

 certain forms thus produced enter erythrocytes and appear in 

 the peripheral circulation. 



T. parva (Theiler) (Fig. 269, i-l). In the cattle in Africa, cause of 

 African coast fever; intracorpuscular forms 1-2/z in diameter; trans- 

 mitted by the tick, Rhipicephalus evertsi and R. appendiculatus 

 (Reichenow, 1937). 



Genus Dactylosoma Labbe. In blood of reptiles and amphibians; 

 schizogony and gametocytes in erythrocytes; invertebrate hosts 

 unknown. 



D. ranarum (Kruse) (Fig. 269, ra-s). In European frogs; schizonts 

 4-9m in diameter; 4-16 merozoites, 2-3m by 1-1. 5/x; gametocytes 

 5-8m by 1.5-3m. 



Genus Toxoplasma Nicolle and Manceaux. Minute intracellular 

 parasites in leucocytes and endothelial cells of various mammals, 

 birds and reptiles; round or ovoid; usually not common in periph- 

 eral blood, though infective through inoculation; ordinarily abun- 

 dant in the liver, spleen, bone marrow, lung, brain, etc.; multiplica- 

 tion by binary fission (Nicolle and Manceaux, 1909). Several species 

 were designated by observers on the basis of the difference in host 

 species. Taxonomy (Chatton and Blanc, 1917) ; morphology (Arantes 

 1914); relation to Plasmodium (Hegner and Wolfson, 1938; Man- 

 well, 1939, 1941). 



^0 



Fig. 270. Toxoplasma gondii. X about 1750. (Chatton and Blanc) 

 a, isolated organisms; b, 2 trophozoites; c, organisms undergoing binary 

 fission; d, a host cell with many organisms which developed by repeated 

 binary fission. 



T. gondii N. and M. (Fig. 270). In Ctenodactylus gundi, a rodent 

 in North Africa; a variety of experimental animals susceptible to it; 

 crescentic; 4-6m by 2-3m; division occurs intra- or extra-cellularly. 



