How do you distinguish between dorsal and ventral surface of the body of earthworm?
The body of earthworm can be distinguished into dorsal and ventral sides due to the presence of certain peculiar feature in it like.
(i) The dorsal surface is darker then ventral surface because it is marked by a dark median mid dorsal line along the longitudinal axis of body. This is due to dorsal blood vessel, seen through integument.
(ii) The ventral surface genital openings (pores), both male and female.
(iii) Genital papilla is located on ventral Surface and help in copulation.
