Clitellum

Definition

The clitellum is a thickened, glandular section of the body wall found in certain annelids, such as earthworms and leeches. It plays a crucial role in reproduction by secreting mucus to form a cocoon for eggs.

5 Must Know Facts For Your Next Test

1. The clitellum becomes more prominent during the reproductive season.
2. It is usually located near the anterior end of the worm.
3. The clitellum produces a mucous sheath used for copulation and egg protection.
4. After mating, it slides off the worm's body, forming an egg capsule that incubates the embryos.
5. Not all annelids possess a clitellum; it is specific to members of the subclass Clitellata.

Review Questions

Related terms

Setae: Small bristle-like structures on annelids used for locomotion.

Segmentation:

The division of an organism's body into repetitive segments or sections.

Hermaphroditism:

A condition where an organism has both male and female reproductive organs.