The annelids (/ ˈænəlɪdz /), also known as the segmented worms, are animals that comprise the phylum Annelida (/ əˈnɛlɪdə /; from Latin anellus 'little ring'). [3][a] The phylum contains over 22,000 extant species, including ragworms, earthworms, and leeches.

Mar 5, 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 into segments by transverse rings, or annulations, from which they take their name.

Phylum 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. Their segmented body distinguishes them from any other organism.

Aug 3, 2023 · About 8,700 known species of Annelida are divided into four main classes, primarily on the basis of presence and absence of parapodia, setae, metameres, and other morphological features.

Aug 1, 2024 · Annelids, commonly known as segmented worms, are soft-bodied, bilaterally symmetrical invertebrates of the phylum Annelida. They constitute the earthworms, leeches, and ragworms, traditionally grouped into polychaetes, oligochaetes (including earthworms), and …

Oct 2, 2024 · Phylum Annelida is a diverse group of organisms within the animal kingdom. They are commonly known as segmented worms or annelids, and they exhibit a wide range of adaptations and lifestyles.

Dec 27, 2024 · Phylum Annelida (L., annelus = little ring or F., anneler = to arrange in rings) is a group of bilaterally symmetrical, coelomate, and segmented animals known commonly as segmented worms.

May 21, 2018 · Annelida A phylum of coelomate (see COELOM) worms that have a definite head and good metameric segmentation. Anatomically they are more complex than the Platyhelminthes. They have vascular, respiratory, and nervous systems which are well developed. The body is elongate, and each segment has chaetae.

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Phylum Annelida includes segmented worms. These animals are found in marine, terrestrial, and freshwater habitats, but a presence of water or humidity is a critical factor for their survival, especially in terrestrial habitats.