The type of nephridia which are highest in number in earthworm and distributed over many segments are

Integumentary nephridia, attached to lining of the body wall of 3rd segment to the last segment. They are about 200 to 250 in each segment. They are 10 times more in number in clitellar segments.Septal nephridia : 40-50 in each segment from 15/16.Pharyngeal nephridia : 3 pairs of tufts, 1 pair each in the 4th, 5th and 6th segments.