What is the excretory structure present in earthworm? Describe their types along with their name and number of segment where they are located.

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​ Please find below the solution to the asked query                               

Excretory structure present in earthworms is known as nephridia. Three types of nephridia are found in earthworms. These are as follows:

(a) Septal nephridia: Opening into the intestines, these nephridia are present on both the sides of the inter-segmental septa behind 15th segment. It helps in discharging the waste into the intestines after which it is excreted out of the body. 

(b) Integumentary nephridia: These nephridia are attached to the body wall from the third segment to the last segment. They help in excreting the waste directly out of the body through nephridiopores.

(c) Pharyngeal nephridia: These are present as three paired tufts in fourth, fifth, and sixth segments.​  It helps in removing the waste from the blood.

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