#annelida

• Annelid — An invertebrate animal from the phylum Annelida, structurally characterized by segmented rings (metamerism), with the body composed of a series of similar ring-like segments. As an adjective, it describes any organism, anatomical trait, or biological process displaying ringed or metameric structures.
• Annelid — The feminine singular form of 'anelid' or a designation used for any invertebrate belonging to the phylum Annelida. In its plural form (anelide), it represents the broad taxonomic group gathering segmented worms (oligochaetes, polychaetes, and hirudineans).
• Annelids — A major phylum of bilaterally symmetrical invertebrate animals (Annelida), comprising segmented worms such as earthworms, leeches, and marine polychaetes. Structurally, their body is characterized by homonomous metamerism, being divided externally and internally (by transverse septa) into a series of repeating ring-like segments, possessing a closed circulatory system and a ventral ganglionic nerve cord.