Comparison between Three Types of Nephridia | Earthworm

Learn about the comparison between three types of nephridia.

Comparison # Septal Nephridia:

1. Occur in segment 15 onward.

2. Attached to the septa.

3. Vary from 80 to 100 per segment.

4. Open internally, having nephrostome.

5. Largest in size.

6. Enteronephric.

7. Remove metabolic wastes from the blood and coelomic fluid.

Comparison # Pharyngeal Nephridia:

1. Occur in segments 4, 5 and 6.

2. Lie on the sides of the gut. Lie in 3 paired groups.

3. Closed internally, without nephrostome.

4. As large as septal nephridia. Enteronephric.

5. Remove metabolic wastes from the blood only.

Comparison # Integumentary Nephridia:

1. Occur in all segments except first two segments.

2. Attached to the body wall.

3. Vary from 200 to 250 per segment. Clitellar segments have 2000-2500 each.

4. Closed internally, without nephrostome.

5. Smallest in size (about half the size of septal nephridia. Ectonephric.

6. Remove metabolic wastes from the blood only.