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Features of Nematodes


Dr Sampurna Roy MD 





Characteristic features of Nematodes  (roundworms) are as follows:

Shape:  Elongated, cylindrical and body is not segmented.

Sexes:  Sexes are separate.

Alimentary canal: Gut is complete. Anus is present

Head end: No sucker or hooks. Well developed buccal capsule in some.

Body cavity: Present

Classification of Nematodes according to habitat:

I  Intestinal-

(a) Small Intestine only:

Ascaris lumbricoides

Ancylostoma duodenale

Necator americanus

Strongyloides stercoralis

Trichinella spiralis

(b) Caecum and appendix:

Enterobius vermicularis (threadworm or pinworm)

Trichuris trichuria

II Somatic (inside the tissue and organs)-

1. Lymphatic System:

Wucheria bancrofti

Brugia malayi

2. Subcutaneous Tissue:

Loa Loa

Onchocerca volvulus

Dracunculus medinensis (Guinea worm)

3. Lungs:

Strongyloides stercoralis

4. Mesentery:

Mansonella ozzardi

5. Conjunctiva:

Loa Loa

III Intestinal & somatic nematodes 

Trichinella spiralis

Other diseases caused by Nematodes:




Cutaneous larva migrans

Visceral Larva Migrans


Visit:  Cestodes (Tapeworms) ; Trematode (Flukes)




Dr Sampurna Roy  MD

Consultant  Histopathologist (Kolkata - India)






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