Ascaris lumbricoides is the largest nematode parasitizing the human intestine. It measures 15-30cm in length and 3-4mm in diameter.
Balantidium Coli is the largest protozoal parasite inhabiting the large intestine of man . It measures up to 60×45micro meter or more. It is the only pathogenic ciliate.
Diphyllobothrium latum is the longest tapeworm found in man. It measures up to 10 metres or more in length with as many as 3000 or more proglottids . the common name is fish tapeworm.
Hymenolepis Nana is the smallest tapeworm infecting humans . it is also known as dwarf tapeworm. The adult tapeworm is small reaching only 4-5cm in length and 1mm in diameter.
Fasciola buski is the largest trematode parasitising man. It measure 20-75mm in length, 8-20mm in breadth, and 0.5-3mm in thickness.
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