Phylum Platyhelminthes (flatworms). Class Trematoda (flukes) 
 

 

 

 
  

Common liver fluke 
(Fasciola hepatica) 

 
Adult 

Chinese liver fluke 
(Clonorchis 

sinensis 
 

Adult 

Cat liver fluke 
(Opisthorchis 

felineus) 
 

Adult 

Lanceolate (lancet) 
fluke 

(Dicrocoelium 
lanceatum = 
Dicrocoelium 
dendriticum) 

 
Adult 

 
  

Minute intestinal fluke 
(Metagonimus yokogawai) 

 
Adult 

Oriental lung fluke 
(Paragonimus westermani) 

 
Adult 

Blood fluke 
(Schistosoma sp.) 

 
Adult male and female 

 
 

  



Phylum Platyhelminthes (flatworms). Class Cestoda (tapeworms) 
 
 

 

 

 

Pork tapeworm 
(Taenia solium) 

 
Scolex 

Pork tapeworm 
(Taenia solium) 

 
Hermaphroditic proglottid 

Pork tapeworm 
(Taenia solium) 

 
Gravid proglottid 

 

 

 
Beef tapeworm 

(Taeniarhynchus saginatus 
= Taenia saginata) 

 
Scolex 

Beef tapeworm 
(Taeniarhynchus saginatus 

= Taenia saginata) 
 

Hermaphroditic proglottid 

Beef tapeworm 
(Taeniarhynchus saginatus 

= Taenia saginata) 
 

Gravid proglottid 

 
Beef tapeworm (Taeniarhynchus saginatus = Taenia saginata) 

 
Transverse section of gravid proglottid 



  
 

Broad fish tapeworm 
(Diphyllobothrium latum) 

 
Scolex 

Broad fish tapeworm 
(Diphyllobothrium latum) 

 
Gravid proglottid 

Dwarf tapeworm 
(Hymenolepis nana) 

 
Cysticercoid larva 

 

 
Dwarf tapeworm 

(Hymenolepis nana) 
 

Scolex 

Dwarf tapeworm 
(Hymenolepis nana) 

 

Adult 

 
 

Dog tapeworm 
(Echinococcus granulosus) 

 
Adult 

Alveolar tapeworm 
(Echinococcus multilocularis) 

 
Adult 

 
 
 
 
 
  



Phylum Nemathelminthes (roundworms). Class Nematoda 
 
 

 
 

Maw worm (Ascaris lumbricoides) 
 

Adult male and female 

Maw worm (Ascaris lumbricoides) 
 

Cross section of adult female 

  
Whip worm 

(Trichocephalus trichiurus = Trichuris 
trichiura) 

 
 

Adult female 

Whip worm 
(Trichocephalus trichiurus = Trichuris 
trichiura) 

 
 

Adult male 

  
Pinworm (Enterobius vermicularis) 

 
Adult female  

Tunnel Hookworm (Ancylostoma duodenale) 
 

Adult male 



 
 

Tunnel Hookworm (Ancylostoma duodenale) 
 

Anterior part of adult 

New World hookworm (Necator americanus) 
 

Anterior part of adult 

  
Palisade worm (Strongyloides stercoralis) 

 
Adult female 

Trichina worm (Trichinella spiralis) 
 

Encysted larva within striated muscles 

 
Dragon or Guinea worm 

(Dracunculus medinensis) 
 

Adult male (left) and female (right) 

Eye worm (Loa loa) 
 

Adult worm in human eye 

 
 

  



EGGS AND LARVA OF HELMINTHS 
 

Eggs of Trematoda helminthes 
 

  
 

Common liver fluke 
(Fasciola hepatica) 

 
 

Cat liver fluke 
(Opistorchis felineus) 

 

Oriental lung fluke  
(Paragonimus westermani) 

 

  
 

 
Urinary blood fluke 

(Schistosoma haematobium) 
 
 

Intestinal blood fluke 
(Schistosoma mansoni) 

 
 

Oriental blood fluke 
(Schistosoma japonicum) 

 
 

 

Eggs of Cestoidea helminthes 
 

   
Broad fish tapeworm 

(Diphyllobothrium latum) 
 
 

Taenia spp. 
 
 

Dwarf tapeworm 
(Hymenolepis nana) 

 
 

 
Eggs and larva of Nematoda helminthes 

 
 



  
 

Maw worm 
(Ascaris lumbricoides) 

 
Unfertilized egg 

 

Maw worm 
(Ascaris lumbricoides) 

 
Fertilized, decorticated egg  

 

Maw worm 
(Ascaris lumbricoides) 

 
Fertilized, corticated egg  

 

   
Whip worm 

(Trichocephalus trichiurus = 
Trichuris trichiura) 

 
 

Pinworm 
(Enterobius vermicularis) 

 
 

Tunnel Hookworm 
(Ancylostoma duodenale) 

 
 

 

 
 

 

Palisade or threadworm (Strongyloides stercoralis) 
 

Rhabditiform larvae