How many types of nephridia are found in earthworms based on their location?
On the basis of location, there are three types of nephridia; Septal Integumentary Pharyngeal (i) Septal Nephridia: Those present on both the sides of intersegmental septa & open into the intestine (ii) Integumental Nephridia: Those found attached to the lining of the body wall & open on the body surface. (iii) Pharyngeal Nephridia: Those found on the 4th, 5th, & 6th segment in the form of three paired tufts are pharyngeal nephridia.
