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 | This article needs additional citations for verification. (June 2012) |
| Nereis | |
|---|---|
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| Nereis pelagica | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Annelida |
| Clade: | Pleistoannelida |
| Subclass: | Errantia |
| Order: | Phyllodocida |
| Family: | Nereididae |
| Subfamily: | Nereidinae |
| Genus: | Nereis Linnaeus, 1758 |
| Type species | |
| Nereis pelagica Linnaeus, 1758
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Nereis is a genus of polychaete worms in the family Nereididae. It comprises many species, most of which are marine. Nereis possess setae and parapodia for locomotion and gas exchange.[1] They may have two types of setae, which are found on the parapodia. Acicular setae provide support. Locomotor setae are for crawling, and are the bristles that are visible on the exterior of the Polychaeta. They are cylindrical in shape, found not only in sandy areas, and they are adapted to burrow. They often cling to seagrass (posidonia) or other grass on rocks and sometimes gather in large groups.
Nereis worms are commonly known as rag worms or clam worms. The body is long, slender, and dorso-ventrally flattened, reaching a length of 5-30 cm. The head consists of two parts: a roughly triangular anterior lobe—the prostomium—and a posterior ring-like portion—the peristomium.[2] The latter bears four pairs of tentacular cirri, dorsally two pairs of eyes, and ventrally a pair of short two-jointed palps.
- ^ "rag worm | annelid | Britannica". www.britannica.com. Retrieved 2021-11-23.
- ^ Tilic, Ekin; Stiller, Josefin; Campos, Ernesto; Pleijel, Fredrik; Rouse, Greg W. (2022-01-01). "Phylogenomics resolves ambiguous relationships within Aciculata (Errantia, Annelida)". Molecular Phylogenetics and Evolution. 166: 107339. Bibcode:2022MolPE.16607339T. doi:10.1016/j.ympev.2021.107339. ISSN 1055-7903. PMID 34751138. S2CID 240267964.