Ragworm
| Nereidae | |
|---|---|
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|
| Alitta succinea | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Annelida |
| Class: | Polychaeta |
| Subclass: | Errantia |
| Order: | Phyllodocida |
| Family: |
Nereidae Fauchald 1977 |
| Genera | |
|
Nereis |
|
Nereis
Platynereis
Alitta
Namalycastis
Namanereis
Eunereis
Hediste
Neanthes
Perinereis
Australonereis
Laeonereis
Dendronereides
Olganereis
Nicon
Rullierinereis
Leptonereis
Sinonereis
Tylonereis
Tylorrhynchus
Ceratocephale
Gymnonereis
Tambalagamia
Micronereides
Ceratonereis
Solomononereis
Unanereis
Lycastopsis
Cheilonereis
Websterinereis
Nereididae (formerly spelled Nereidae) are a family of polychaete worms. It contains about 500 – mostly marine – species grouped into 42 genera. They may be commonly called ragworms or clam worms.
The prostomium of Nereididae bears a pair of palps that are differentiated into two units, the proximal unit is much larger than the distal unit. Parapodia are mostly biramous (only the first two pairs are uniramous). Peristomium fused with the first body segment, with usually two pairs of tentacular cirri. The first body segment with 1-2 pairs tentacular cirri without aciculae. Compound setae present. Notopodia are distinct (rarely reduced), usually with more flattened lobes, notosetae compound falcigers and/or spinigers (rarely notosetae absent). They have two prostomial antennae (absent in Micronereis). Their pharynx, when everted, clearly consists of two portions, with a pair of strong jaws on the distal portion and usually with conical teeth on one or more areas of both portions. Most genera have no gills (if present, they are usually branched and arise on mid-anterior segments of body). The larval body consists of four segments.
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Wikipedia