(i) Nephredia is the excretory organ present in earthworm. (ii) Three types of nephridia are found in earthworms:(a) Septal nephridia: Present on both sides of the intersegmental septa.(b) Integumentary nephridia: Attached to the lining of the body wall.(c) Pharnygeal nephridia: Found in the 4^th ,5^th and 6^th segments.