A) Monogenoidea
B) Turbellaria
C) Menopostnocotyla
D) Aspidogastria
Correct Answer: B
Solution :
The members of class-Turbellaria are usually non-parasitic, free-living worms. It is exempted (free from an obligation imposed on others) from other classes of Platyhelminthes. Aspidogastrea is an order of class- Trematoda. Its members are endoparasite in gut of fishes and reptiles. Members of order-Monogenea (Monogenoidea) are ectoparasite on cold blooded aquatic vertebrates.
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