The clitellum is a thickened glandular and non-segmented section of the body wall near the head in earthworms and leeches, that secretes a viscid sac in which the eggs are deposited. It is present about behind the anterior end of the body (around the 14th, 15th and 16th segments). Its main function is to store the eggs of the worm.

The clitellum is a thickened glandular and non-segmented section of the body wall near the head in earthworms and leeches, that secretes a viscid sac in which the eggs are deposited. It is present about behind the anterior end of the body (around the 14th, 15th and 16th segments). Its main function is to store the eggs of the worm.