Setae and parapodia are locomotory structures in annelids. Except leeches, unjointed chitinous setae are often present. Some annelids such as Nereis have unjointed, locomotory structures, the parapodia (para-parallel, podia
- feet).
The leech bears two suckers. The anterior sucker encloses the mouth. It acts as a feeding, locomotory and prehensile organ. The posterior sucker lies at the hinder part of the body.