Question

write short note on nephyridia of earthworm
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Answer 1

These are of three types according to their location in the body:

1. Septal nephridia;

2. Integumentary nephridia

3. Pharyngeal nephridia.

. Septal Nephridia:

These are found situated on the inter-seg­mental septum between 15th and 16th segments to the posterior side of the body.

Each septum bears nephridia on both the surfaces arranged in semicircles around the intestine, two rows in front of the septum and two behind it. Each septum has about 40 to 50 nephridia in front and the same number behind, so that each segment possesses 80 to 100 septal nephridia except the 15th segment which has only 40 to 50 nephridia. These are not found in the segments up to 14th.

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