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Learn about the comparison between three types of nephridia.
Comparison # Septal Nephridia:
1. Occur in segment 15 onward.
2. Attached to the septa.
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3. Vary from 80 to 100 per segment.
4. Open internally, having nephrostome.
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5. Largest in size.
6. Enteronephric.
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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.
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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.
