Why nephridia in earthworm that are similar in structure classified into three types? Mention the names of each.
Nephridia in earthworms are similar in structure they are classified into different types based on their location.
1. Septal Nephridia: It is located in both sides of the intersegmental septa from the 15th segment till the end
2. Pharyngeal Nephridia: It is located in the 4th, 5th and 6th segment of the earthworm.
3. Integumentary Nephridia: It is located in the body wall i.e., the integument of the earthworm.