D. None of the above.
The trematode shown in the picture above represents Fasciolopsis buski.
Largest trematode infecting man is Fasciolopsis buski.
- It is commonly called the giant intestinal fluke, because it is an exceptionally large parasitic fluke, and the largest known to parasitise humans.
- Its size is variable and a mature specimen might be as little as 2 cm long, but the body may grow to a length of 7.5 cm and a width of 2.5 cm.
- It is a common parasite of humans and pigs and is most prevalent in Southern and Southeaster n Asia.
- It is a member of the family Fasciolidae in the order Echinostomida.
- The Echinostomida are members of the class Trematoda, the flukes.
- The fluke differs from most species that parasitise large mammals, in that they inhabit the gut rather than the liver as Fasciola species do.
- Fasciolopsis buski generally occupies the upper region of the small intestine, but in heavy infestations can also be found in the stomach and lower regions of the intestine.
- Fasciolopsis buski is the cause of the pathological condition fasciolopsiasis.