Question

# Which one of the following does not belong to phylum Nematoda?PinwormFilarialwormIntestinal wormEarthworm

Solution

## The correct option is D EarthwormNematodes are bilaterally symmetric and triploblastic organisms. They are pseudocoelomate, i.e., true body cavity is absent. E.g. Filarial worms, roundworms, pinworms, etc. Earthworm is placed in the phylum Annelida. Eventhough they are triploblastic and bilaterally symmetric organisms, they do possess a true body cavity hence are not placed in Nematoda.

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