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.
Annelid | Definition, Characteristics, Habitat, Reproduction, Diet ...
WEBAug 8, 2024 · A major invertebrate phylum of the animal kingdom, the annelids number more than 9,000 species distributed among three classes: the marine worms (Polychaeta), which are divided into free-moving and sedentary, or tube-dwelling, forms; the earthworms (Oligochaeta); and the leeches (Hirudinea).
Segmented Worms and Their Species - ThoughtCo
WEBJan 20, 2019 · Segmented worms (Annelida) are a group of invertebrates that includes about 12,000 species of earthworms, ragworms, and leeches. Segmented worms live in marine habitats such as the intertidal zone and near hydrothermal vents. Segmented worms also inhabit freshwater aquatic habitats as well as …
28.3G: 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.
ADW: Annelida: INFORMATION
WEBThe 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 subdivisions that partially transect the body cavity. Segmentation is …
14.14: Phylum Annelida - Biology LibreTexts
WEBJul 31, 2022 · 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.
9.5: Segmented Worms - K12 LibreTexts
WEBJan 11, 2021 · Segmented worms are in the phylum Annelida, which has over 22,000 known species. These worms are known as the segmented worms because their bodies are segmented, or separated into repeating units. Besides the earthworm, the segmented worms also include leeches and some marine worms.
Structure 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).
Introduction to the Annelida - University of California Museum of ...
WEBEverybody's favorite, worms. . . Segmented worms make up the Phylum Annelida. The phylum includes earthworms and their relatives, leeches, and a large number of mostly marine worms known as polychaetes. Various species of polychaete are known as lugworms, clam worms, bristleworms, fire worms, sea mice, and "EWWW! I …
Segmented Worms - Encyclopedia.com
WEBSegmented worms (phylum Annelida) are so named because of their elongated, more or less cylindrical bodies divided by grooves into a series of ring like segments. Typically, the external grooves correspond to internal partitions called septa, which divide the internal body space into a series of compartments.
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