Annelids are considered members of the Lophotrochozoa, a "super-phylum" of protostomes that also includes molluscs, brachiopods, and nemerteans. The basic annelid form consists of …

Dec 16, 2025 · annelid, any member of a phylum of invertebrate animals that are characterized by the possession of a body cavity (or coelom), movable bristles (or setae), and a body divided …

Nov 5, 2025 · Annelids, commonly known as segmented worms, are soft-bodied, bilaterally symmetrical invertebrates of the phylum Annelida. They constitute the earthworms, leeches, …

Jun 23, 2025 · By breaking down organic detritus, annelids in all habitats make nutrients available to other organisms. Annelids also form a meaningful link in many food webs. They are a food …

The annelids include earthworms, polychaete worms, and leeches. All members of the group are to some extent segmented, in other words, made up of segments that are formed by …

Aug 3, 2023 · Annelida definition Annelids are defined as triploblastic, bilaterally symmetrical, metamerically segmented, a coelomate worm with a thin flexible cuticle around the body.

Approximately 22,000 species have been described in phylum Annelida, which includes polychaete worms (marine annelids with multiple appendages), and clitellates (earthworms …

Dec 1, 2025 · All annelids have a worm-shaped, segmented body, but one main difference among them is the number and organization of bristles and appendages. Annelids are bilaterally …

The annelids (from Latin anellus "little ring") are a large phylum (Annelida) of invertebrate animals, comprising the segmented worms, including the well-known earthworms and leeches. There …

Annelids show the presence of a true coelom, derived from embryonic mesoderm and protostomy. Hence, they are the most advanced worms. A well-developed and complete digestive system …