1) They are animals with dorsoventrally flat and bilaterally symmetrical bodies.
2) They are endoparasitic in nature found in the body of host.
3) They are hermaphrodite having both male and female organ in the same body.
4) The mouth is provided with hook and suckers.
5) They are triploblastic acoelomate animal.
6) The body function is carried by organs.
7) The excretion is done by flame cells.
8) They do not have blood vascular system and respiratory system.
9) They have primitive type of nervous system.
10)They complete life cycle in one or more host.
Examples:- Fasciola hepatica, Taenia solium(tapeworm),planaria
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