Protonephridia are found in all of the following, except

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cephalochordates

crustaceans

rotifers

flatworms

answer is D.

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Detailed Solution

Protonephridia or flame cells are the excretory structures in Platyhelminthes (Flatworms, e.g., Planaria), rotifers, some annelids and the cephalochordate – Amphioxus. Protonephridia are primarily concerned with ionic and fluid volume regulation, i.e., osmoregulation. Antennal glands or green glands perform the excretory function in crustaceans like prawns.

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