Reproduction

-Depending on the species, annelids can reproduce sexually or asexually.

Asexual:
-fission is a method used by some annelids and allows them to reproduce quickly.
-the posterior end of the annelid breaks off and forms into a new worm.
Lumbriculus and Aulophorus (different kinds of annelids) for example, are known to reproduce by the body breaking into such fragments.

Sexual:
-Some annelida species are hermaphroditic, while others have distinct sexes.
-Most annelida reproduce by copulation.
-Two worms which are attracted by each other's secretions lay their bodies together with their heads pointing opposite directions. The fluid is transferred from the male pore to the other worm.
-Some annelida transfer sperm differently, by means of using a spermathecae (sperm storing chambers)
-The clitellum secretes a muscus that makes a 'coocon' around the egg and start to develop.