What does the term annelida mean?

Annelida comes from Latin word anellus or anellum, which means " little ring." It refers to the ringed external appearance of members of this phylum which includes segmented worms known as earthworms, leeches, and bristle worms or polychaetas. The segmented body structure is a distinct characteristics of annelids, which helps them with movement, flexibility, and adaptation to a diverse environments.