1) They are marine or freshwater animal.
2) They are pseudocoelomate which means they have a cavity called pseudocoel between the gut and body wall.
3) They are non segmented round worm.
4) Their body is covered with cuticle .
5) They have simple type of digestive system.
6) They do not have respiratory system and circulatory system.
7) They have poorly developed nervous system.
8) They are unisexual animals.
9) They are endoparasite .
10) The mouth is provided with hooks and suckers.
Examples: Ascaris and Hookworm, pinworm
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