Annelids
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Annelid - Wikipedia
WEBThe annelids / ˈ æ n ə l ɪ d z / (Annelida / ə ˈ n ɛ l ɪ d ə /, from Latin anellus, "little ring" [3] [a]), also known as the segmented worms, are a large phylum, with over 22,000 extant species including ragworms, earthworms, and leeches.
En.wikipedia.orgAnnelid | Definition, Characteristics, Habitat, Reproduction
WEB4 days ago · 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 …
Britannica.com11.9: 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.
Bio.libretexts.orgAnnelid - Segmentation, Setae, Metamerism | Britannica
WEBJun 13, 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).
Britannica.comStructure and classes of annelid | Britannica
WEBKnown as segmented worms, annelids are divided into three classes: marine worms (Polychaeta; see polychaete), earthworms (Oligochaeta), and leeches (Hirudinea).
Britannica.com28.3G: Phylum Annelida - Biology LibreTexts
WEBOct 31, 2023 · Approximately 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.
Bio.libretexts.orgAnnelid - New World Encyclopedia
WEBThe 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 are about 15,000 known modern species of annelids.
Newworldencyclopedia.org