Oral sucker 

 Pharynx 



Genird pore Uterus 

 Yolk gland 



Ovory Ootype 



Testis Excretory blade 

 Sperm duct 



Mouth 

 htestlne 



Excretory pore 



Ventral sucker yolk duct Peminal receptacle 



Seminal vesicle tourer's con^l 



ADULT TREMATODE FROM BILE DUaS "* 



Adult trematode sheds 



eggs which ore carried 



out of the body in feces 



Man becomes infected by eating poorly cooked 

 or raw fish with cysts C^^ 



Cercarioe emerge from 

 Snail and encyst in 

 muscles of certain 

 freshwater fishes 



Eggs containing 

 miracidia ore ingested 

 by snail host 



K 



Encysted stage 

 (mefocercoria) 

 dissected free 

 of cyst 

 Ventral sucker- 



c^ 



Sporocyst stage 

 from snail 



Young cercaria 



— Germ ball 



®JI Cercana Redio stage from snail 



Figure 74. Life cycle and structure of the human liver fluke, Clonorchis sinensis. 



142 



