Do annelid worms have a nerve ring?

Annelid worms do not have a nerve ring like those found in some other invertebrates, such as echinoderms. Instead, they possess a centralized nervous system that includes a ventral nerve cord and a series of segmentally arranged ganglia. These ganglia function similarly to a nerve ring by coordinating movement and sensory responses, but they are distributed along the length of the body rather than forming a single ring structure.