The smallest intestinal adult nematode is
Strongyloides stercoralis has the most complex life cycle of all the intestinal nematodes--and the greatest risk of acute, overwhelming infection. The adults measure only 2 mm in length, making them the smallest of the intestinal nematodes.Ref: Sherris microbiology; 6th edition; Page no: 858
Enterobius vermicularis
Necator americanus
Strongyloides stercoralis
Trichuris trichiura
parasitology