244 



PKOTOZOOLOCY 



P. microspora S. (Fig. Ill, d). Lorica yellowish brown, with a 

 small aperture; 12-18// long; flagcllum short; among roots of 

 Lemna. 



Family 5 Trypanosomatidae Doflein 



Body characteristically leaf-like, although changeable to a cer- 

 tain extent; a single nucleus and a blepharoplast; a flagellum 

 originates in a basal granule w^hich may be independent from, or 

 united with, the blepharoplast (Figs. 9, 112); basal portion of 

 flagellum forms outer margin of undulating membrane which ex- 

 tends along one side of body; exclusively parasitic; a number of 

 important parasitic Protozoa which are responsible for serious 

 diseases of man and domestic animals in various parts of the 

 world are included in it. 



In vertebrate 

 host 



In invertebrate host 



In vertebrate 

 host 



Trypanosoma 



Trypanosoma 



Crithidia 



Leptomonas Leishmania 



Leishmania 



Leptomonas and 

 Phytomonas (in plant) 



Leishmania 



Crithidia 



Herpetomonas 



Trypanosoma 



Fig. 112. Diagram illustrating the structural differences among the 

 genera of Trypanosomatidae (Wenyon). 



Genus Trypanosoma Gruby. Parasitic in the circulatory system 

 of vertebrates; highly flattened, pointed at flagellate end, and 

 bluntly rounded, or pointed, at other; polymorphism due to dif- 

 ferences in development common; nucleus central; near bluntly 

 rounded end, there is a blepharoplast and usually a basal granule 

 from which the flagellum arises and runs toward^opposite end, 

 marking the outer boundary of the undulating membrane; in 



