Why nephridia in earthworm that are similar in structure classified into three types? Mention the names of each.

Nephridia in earthworms are same in structure that are further classify into different types on their location.

1. Septal Nephridia- It is located in both sides of the inter segmental septa from the fifteen segment till the end
2. Pharyngeal Nephridia-It is located in the fourth, fifth,and sixth segment of the earthworm.
3. Integumentary Nephridia- It is located in the body wall of earthworms .For example – the integument of the earthworm.