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Nereis

From Wikipedia, the free encyclopedia
Genus of annelid worms
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Nereis
Nereis pelagica
Scientific classificationEdit this classification
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

Nereis is agenus ofpolychaeteworms in the familyNereididae. It comprises many species, most of which aremarine.Nereis possesssetae andparapodia 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.

Etymology

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The scientific Latin genus nameNereis derives from the Ancient Greek Νηρηΐς : Nērēís (stem Νηρηΐδ- : Nērēid), a sea nymph.

Ecology

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Nereis areosmoconformers. They aredioecious (individuals are male or female) and they release theirhaploid gametes into the water, a process calledspawning. Moreover, upon fertilization andmitotic divisions of thezygote, Nereids form a larval stage which is similar to that ofmolluscs – i.e. atrochophorelarva.

Species

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The genusNereis contains the following species:[3]

References

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  1. ^"rag worm | annelid | Britannica".www.britannica.com. Retrieved2021-11-23.
  2. ^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.
  3. ^Geoffrey Read, Kristian Fauchald & Gérard Bellan (2012). Read G, Fauchald K (eds.)."Nereis".World Polychaeta Database.World Register of Marine Species. RetrievedJune 10, 2012.
Nereis
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