Nephrostome occurs in

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(A) In the earthworm,nephridia are classified based on their location into three types: septal,integumentary,and pharyngeal.Among these,only the septa

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Septal nephridia

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(A) In the earthworm,nephridia are classified based on their location into three types: septal,integumentary,and pharyngeal.Among these,only the septal nephridia possess a ciliated funnel-like structure called the nephrostome,which helps in collecting coelomic fluid.Integumentary and pharyngeal nephridia lack a nephrostome.Therefore,the correct option is $A$.

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