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. 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. They are dangerous to touch giving very painful long lasting burns. 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. The latter bears a pair of terminal tentacles, dorsally two pairs of eyes, and ventrally a pair of short two-jointed palps.
Aphrodita is a genus of marine polychaete worms found in the Mediterranean sea and the eastern and western Atlantic Ocean.
The Terebellidae is a marine family of polychaete worms, of which the type taxon is Terebella, described by Carl Linnaeus in his 1767 12th edition of Systema Naturae.
Harmothoe is a genus of marine Polychaete worms belonging to the family Polynoidae. Species of Harmothoe are found world-wide to depths of at least 5,000 m but are more common in shallower water.
Ampharete is a genus of polychaete annelid worm with a single, chevron-shaped row of teeth.
Phyllodoce is a genus of polychaete worms, which contains about 200 species. The prostomium bears eyes, two pairs of antennae and a pair of large retractile nuchal organs. The eversible proboscis is clearly divided into two parts.
Pettais a genus in the polychaetefamily Pectinariidae.
Terebellides is a genus of polychaete worms in the family Trichobranchidae.
Eunoe is a genus of marine annelids in the family Polynoidae. The genus includes 48 species which are found world-wide, mostly from depths of 50 m or more.
Eucranta is a genus of marine annelids in the family Polynoidae. The genus includes 5 species which are globally distributed from depths of about 40 to 600 m, mostly from high latitudes in the northern and southern hemispheres.
Gattyana is a genus of marine annelids in the family Polynoidae. The genus includes 11 species, 9 of which occur in the northern hemisphere, the remaining two are from the Indian Ocean off Mozambique and the Southern Ocean off New Zealand. Species of Gattyana are known from shallow water down to depths of about 1200 m.
Thelepus is a genus of polychaetes belonging to the family Terebellidae.
Diplocirrus is a genus of annelids belonging to the family Flabelligeridae.
Odontosyllis is a genus of annelids belonging to the family Syllidae.
Prionospio is a genus of annelids belonging to the family Spionidae.
Loimia is a genus of annelids belonging to the family Terebellidae.
Chone is a genus of polychaetes belonging to the family Sabellidae.
Lanassa is a genus of annelids belonging to the family Terebellidae.
Lumbrineris is a genus of polychaetes belonging to the family Lumbrineridae.
