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Question
Why nephridia in earthworm that are basically similar in structure classified into three types? Mention the names of each.
Solution
Nephridia are found in invertebrates and function similarly to vertebrate kidneys. They are classified into three types on the basis of their location in the body.
- Septal nephridia:- This kind of nephridia is present on both sides of the intersegmental septa of segment no.15 to last.
- Integumentary nephridia:- These are attached to the lining of the body wall of segment no.3 to last.
- Pharyngeal nephridia:- These are present as tufts in the three pairs in segment no. 4th, 5th and 6th.
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