CHAPTER XVII. 



FLAT WORMS. 



CLASSIFICATION OF THE PLATYHELMINTHES (FLAT WORMS). 



Class 



Family 



Trematoda 



Fasciolidae 



Paramphistomidse 



Schistosomidse 



Genus 



Fasciola 



Fascioletta 



Fasciolopsis 



Dicrocoelium 



Paragonimus 



Opisthorchis 



Clonorchis 



Heterophyes 



Cladorchis 



Gastrodiscus 



Schistosomum 



Cestoda 



,., f Dibothriocephalus 

 Dibothnocephahdae I 



Tseniidae 



Diplogonoporus 

 Dipylidium 



Hymenolepis 



Taenia 

 Davainea 



Species 



F. hepatica 

 F. ilocana 



F. buski 



D. lanceatum 

 P. westermanii 

 O. felineus 

 C. sinensis 

 C. endemicus 

 H. heterophyes 



C. watsoni 



G. hominis 



S. haematobium 

 S. japonicum 

 S. mansoni 



D. latus 

 D. grandis 

 D. caninum 

 H. nana 



H. diminuta 



T. solium 



T. saginata 



D. madagascariensis 



NOTE. Two larval Taeniidaeare found in man (Cysticercus cellulosae and Echino- 

 coccus polymorphus). 



Also two larval Dibothriocephalidae (Sparganum mansoni and Sparganum 

 prolifer). 



Two parasites often referred to as ophthalmic flukes have been reported lying 

 between the crystalline lens and its membrane. They have been considered as 

 possibly trematode larvae. Distomum ophthalmobium was found in 1850 in the eye 

 of a child and Monostoma lentis in the eye of an old woman. 



TREMATODES OR FLUKES. 



Flukes are generally leaf-like in outline, rarely cylindrical, and exhibit 

 marked variation in size and shape. They are nonsegmented and do 



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