Annelid - Wikipedia
WEBThe annelids (/ ˈænəlɪdz /), also known as the segmented worms, comprise a large phylum called Annelida (/ əˈnɛlɪdə /; from Latin anellus 'little ring'). [3][a] It contains over 22,000 extant species, including ragworms, earthworms, and leeches.
Annelid | Definition, Characteristics, Habitat, Reproduction ...
WEBAug 8, 2024 · 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 into segments by transverse …
33.6: Annelids (Annelida) - Biology LibreTexts
WEBApproximately 16,500 species have been described in phylum Annelida. The phylum includes earthworms, polychaete worms, and leeches. Annelids show protostomic development in embryonic stages and are often called “segmented worms” due to their key characteristic of metamerism, or true segmentation.
Annelid - Segmentation, Setae, Metamerism | Britannica
WEBAug 8, 2024 · Annelid - Segmentation, Setae, Metamerism: The body of an annelid is often described as a tube within a tube. The body form of polychaetes varies, depending on whether the polychaete is free-moving, sedentary, or pelagic (ocean-dwelling).
Phylum Annelida- Characteristics And Classification - BYJU'S
WEBPhylum Annelida is a very broad phylum belonging to the kingdom Animalia. The Annelids are found in aquatic as well as terrestrial environments. These are bilaterally symmetrical invertebrate organisms.
11.9: Annelids - Biology LibreTexts
WEBAnnelids are segmented worms such as earthworms and leeches. Annelids have a coelom, closed circulatory system, excretory system, and complete digestive system. They also have a brain. Earthworms are important deposit feeders that help form and enrich soil. Leeches are either predators or parasites.
Structure and classes of annelid | Britannica
WEBannelid , Any member of a phylum (Annelida) of invertebrate animals that possess a body cavity (coelom), movable bristles (setae), and a body divided into segments by crosswise rings. Known as segmented worms, annelids are divided into three classes: marine worms (Polychaeta; see polychaete), earthworms (Oligochaeta), and leeches (Hirudinea).