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. 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.
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.
Nephtys is a genus of marine catworms. Some species are halotolerant to a degree in that they can survive in estuaries and estuarine lagoons down to a salinity of 20 psu.
Lanice,, is a genus of burrowing marine polychaetes typically found in the littoral zone.
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 worms. They have a single, chevron-shaped row of teeth.
Pettais a genus in the polychaetefamily Pectinariidae.
Syllidae, commonly known as the necklace worms, is a family of small to medium-sized polychaete worms. Syllids are distinguished from other polychaetes by the presence of a muscular region of the anterior digestive tract known as the proventricle.
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.
Eunoe oerstedi is a scale worm which is widely distributed in the Arctic Ocean, North Atlantic Ocean and North Pacific Ocean from shallow waters to depths of about 950m.
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.
Aglaophamus is a genus of free-burrowing nephtyid worms.
Marphysa is a genus of annelids belonging to the family Eunicidae.
Thelepus is a genus of polychaetes belonging to the family Terebellidae.
Neoamphitrite is a genus of polychaetes belonging to the family Terebellidae.
Eupolymnia is a genus of annelids belonging to the family Terebellidae.
Loimia is a genus of annelids belonging to the family Terebellidae.
Chone is a genus of polychaetes belonging to the family Sabellidae.
Hauchiella is a genus of annelids belonging to the family Terebellidae.
Pionosyllis is a genus of polychaetes belonging to the family Syllidae.
