Habit and habitat: Most members areparasitic. Some of them lives as parasites of plant roots or grains (Wheat. paddy) Intestine, blood and other organs of different animals. some are free living they live in soil and water. On the basis of number they are second largest phylum of animalkingdom.
a) Body cylindrical, covered with thick cuticle and bilaterally symmetrical.
b) Complete digestive system (Mouth and anal opening present).
c) Body cavity uncovered, there is no true coelom.
d) Circulatory and respiratory system absent.
e) They are generally unisexual.
Ascaris lumbricoides (Round worm)
Ancylostoma duodenale (Hook worm)
Enterobius vermicularis (pin worm)
Rhabditis- free living, Live in soil.
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