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Question
Distinguish between the following: Septal nephridium and pharyngeal nephridium
Solution
| Septal nephridium | Pharyngeal nephridium | |
| 1 | Occur in segment 15 onward | Occur in segments 4,5, 6 |
| 2 | Attached to the septa | Lie on the sides of the gut |
| 3 | Their number varies from 80 to 100 per segment | There are only 3 pairs of pharyngeal nephridia |
| 4 | Remove metabolic wastes from the blood and coelomic fluid | Remove metabolic wastes from the blood only |
| 5 | These nephridia discharge their excretory matter into lumen of alimentary canal | The duct of nephridia of sixth segment open into buccal cavity while ducts of nephridia of fourth and fifth segment open into pharynx. |
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