Nephridia are of three types :
(i) Septal Nephridia : These are present on both the sides of intersegmental septa and open into intestine
(ii) Integumental Nephridia : These are found attached to the lining of the body wall and open on the body surface.
(iii) Pharyngeal Nephridia : These are found on the 4th, 5th, and 6th segment in the form of three paired tufts.
