Cleidochasmatidae Cheetham & Sandberg, 1964 (additional source)
Eurystrotos compacta (Norman, 1866) accepted as Oncousoecia dilatans (Johnston, 1847) (additional source)
Fabricia sabella (Ehrenberg, 1836) accepted as Fabricia stellaris (Müller, 1774) (additional source)
Hippopodinella Barroso, 1924 accepted as Odontoporella Héjjas, 1894 (basis of record)
Hippopodinella lata (Busk, 1856) accepted as Odontoporella lata (Busk, 1856) accepted as Hagiosynodos latus (Busk, 1856) (basis of record)
Idotea metallica Bosc, 1801 (additional source)
Pedicellina hispida Ryland, 1965 (additional source)
Scruparia ambigua (d'Orbigny, 1841) (additional source)

Adriatic Sea for Eurystrotos compacta (Norman, 1866) 
Adriatic Sea for Idotea metallica Bosc, 1801 
Arctic Ocean for Chone filicaudata Southern, 1914 
Arctic Ocean for Fabricia sabella (Ehrenberg, 1836) 
Arctic Ocean for Harpinia antennaria Meinert, 1890 
Baltic sea for Nephtys assimilis Örsted, 1843 
Bay of Biscay for Harpinia antennaria Meinert, 1890 
Black Sea for Fabricia sabella (Ehrenberg, 1836) 
Black Sea for Gastrosaccus sanctus (Van Beneden, 1861) 
Black Sea for Idotea metallica Bosc, 1801 
Black Sea for Spio decorata Bobretzky, 1870 
Bordeaux for Hesionura elongata (Southern, 1914) 
Boulogne-sur-Mer for Ensis directus (Conrad, 1844) sensu Abbott, 1954 
Boulogne-sur-Mer for Fucus vesiculosus Linnaeus, 1753 
Boulogne-sur-Mer for Glycera celtica O'Connor, 1987 
Boulogne-sur-Mer for Idotea metallica Bosc, 1801 
Bretagne for Synonchus brevisetosus (Southern, 1914) 
Bretagne Nord for Eurystrotos compacta (Norman, 1866) 
Bretagne Nord for Scruparia ambigua (d'Orbigny, 1841) 
Bretagne Sud for Eurystrotos compacta (Norman, 1866) 
Bretagne Sud for Glycera oxycephala Ehlers, 1887 
British Isles for Mediomastus fragilis Rasmussen, 1973 
Calais for Fabricia sabella (Ehrenberg, 1836) 
Calais for Gastrosaccus sanctus (Van Beneden, 1861) 
Calais for Hesionura elongata (Southern, 1914) 
Calais for Protodriloides chaetifer (Remane, 1926) 
Calais for Tetrastemma helvolum Bürger, 1895 
Cap Gris Nez for Abietinaria abietina (Linnaeus, 1758) 
Cap Gris Nez for Amphiblestrum flemingii (Busk, 1854) 
Cap Gris Nez for Eurystrotos compacta (Norman, 1866) 
Cap Gris Nez for Hippopodinella lata (Busk, 1856) 
Cap Gris Nez for Hydrallmania falcata (Linnaeus, 1758) 
Cap Gris Nez for Pedicellina hispida Ryland, 1965 
Cap Gris Nez for Plesiothoa gigerium (Ryland & Gordon, 1977) 
Cap Gris Nez for Scruparia ambigua (d'Orbigny, 1841) 
Cap Gris Nez for Sertularia cupressina Linnaeus, 1758 
Celtic Sea for Glycera celtica O'Connor, 1987 
Danish Exclusive Economic Zone for Eurystrotos compacta (Norman, 1866) 
Danish Exclusive Economic Zone for Gastrosaccus sanctus (Van Beneden, 1861) 
Danish Exclusive Economic Zone for Hesionura elongata (Southern, 1914) 
Dieppe for Amphiblestrum flemingii (Busk, 1854) 
Dieppe for Chone filicaudata Southern, 1914 
Dieppe for Glycera oxycephala Ehlers, 1887 
Dublin Bay for Mediomastus fragilis Rasmussen, 1973 
Dunkerque for Anaitides longipes (Kinberg, 1866) 
Dunkerque for Capitella giardi (Mesnil, 1897) 
Dunkerque for Ensis directus (Conrad, 1844) sensu Abbott, 1954  (origin: alien)
Dunkerque for Gastrosaccus sanctus (Van Beneden, 1861) 
Dunkerque for Mediomastus fragilis Rasmussen, 1973 
Dunkerque for Nephtys assimilis Örsted, 1843 
Dunkerque for Phoronis muelleri Selys-Longchamps, 1903 
Dunkerque for Spio decorata Bobretzky, 1870 
Dunkerque for Tetrastemma helvolum Bürger, 1895 
East Africa for Gastrosaccus sanctus (Van Beneden, 1861) 
English Channel for Amphiblestrum flemingii (Busk, 1854) 
English Channel for Anaitides longipes (Kinberg, 1866) 
English Channel for Glycera celtica O'Connor, 1987 
English Channel for Hippopodinella lata (Busk, 1856) 
English Channel for Plesiothoa gigerium (Ryland & Gordon, 1977) 
English Channel for Spio decorata Bobretzky, 1870 
Estuary of the Canche for Anaitides longipes (Kinberg, 1866) 
Estuary of the Canche for Capitella giardi (Mesnil, 1897) 
Estuary of the Canche for Harpinia antennaria Meinert, 1890 
Estuary of the Canche for Myriochele oculata Zachs, 1923 
Estuary of the Canche for Synonchus brevisetosus (Southern, 1914) 
Estuary of the Canche for Tanaopsis graciloides (Lilljeborg, 1864) 
French part of Greater North Sea for Ensis directus (Conrad, 1844) sensu Abbott, 1954  (origin: alien)
German Bight for Ensis directus (Conrad, 1844) sensu Abbott, 1954  (origin: alien)
Greenlandic Exclusive Economic Zone for Protodriloides chaetifer (Remane, 1926) 
Indian Ocean for Protodriloides chaetifer (Remane, 1926) 
Irish Sea for Chone filicaudata Southern, 1914 
Isle of Man for Amphiblestrum flemingii (Busk, 1854) 
Isle of Man for Capitella giardi (Mesnil, 1897) 
Isle of Man for Eurystrotos compacta (Norman, 1866) 
Isle of Man for Fabricia sabella (Ehrenberg, 1836) 
Isle of Man for Harpinia antennaria Meinert, 1890 
Isle of Man for Hippopodinella lata (Busk, 1856) 
Isle of Man for Phoronis muelleri Selys-Longchamps, 1903 
Isle of Man for Tanaopsis graciloides (Lilljeborg, 1864) 
Italian Exclusive Economic Zone for Tanaopsis graciloides (Lilljeborg, 1864) 
Liverpool Bay for Mediomastus fragilis Rasmussen, 1973 
Manche for Phoronis muelleri Selys-Longchamps, 1903 
Mediterranean Sea for Fabricia sabella (Ehrenberg, 1836) 
Mediterranean Sea for Gastrosaccus sanctus (Van Beneden, 1861) 
Mediterranean Sea for Glycera celtica O'Connor, 1987 
Mediterranean Sea for Hippopodinella lata (Busk, 1856) 
Mediterranean Sea for Idotea metallica Bosc, 1801 
Mediterranean Sea for Phoronis muelleri Selys-Longchamps, 1903 
Mediterranean Sea for Protodriloides chaetifer (Remane, 1926) 
Mediterranean Sea for Spio decorata Bobretzky, 1870 
Mediterranean Sea for Tetrastemma helvolum Bürger, 1895 
North East Atlantic for Capitella giardi (Mesnil, 1897) 
North East Atlantic for Chone filicaudata Southern, 1914 
North East Atlantic for Harpinia antennaria Meinert, 1890 
North Sea for Chone filicaudata Southern, 1914 
North Sea for Fabricia sabella (Ehrenberg, 1836) 
North Sea for Glycera celtica O'Connor, 1987 
North West Atlantic for Capitella giardi (Mesnil, 1897) 
North West Atlantic for Glycera oxycephala Ehlers, 1887 
North West Atlantic for Idotea metallica Bosc, 1801 

 Distribution

 for Anaitides longipes (Kinberg, 1866)

This species is widely distributed, reported in Chili, Mexico, North Carolina, South Africa, North-East Atlantic: ... [details]

 Distribution

 for Hesionura elongata (Southern, 1914)

This species is also reported in the Bahamas.
Generally found between 0 - 50 m in fine sand to gravel. [details]

 Distribution

 for Idotea metallica Bosc, 1801

Species, originally from North America, occurs occasionally on the British coasts and most probably is brought here ... [details]

 Distribution

 for Mediomastus fragilis Rasmussen, 1973

This is the only Mediomastus species occuring in European waters. [details]

 Distribution

 for Myriochele oculata Zachs, 1923

Boreal-arctic species, which is distributed from above 80° N to south-west British Isles, as well as the Japan ... [details]

 Distribution

 for Pedicellina hispida Ryland, 1965

Davoult et al. Reports on an occurence in New Zealand. [details]

 Distribution

 for Scruparia ambigua (d'Orbigny, 1841)

Cosmopolite species, except for arctic waters at a depth of 0-50 m [details]

 Ecology

 for Pedicellina hispida Ryland, 1965

This species is often observed living on hydrozoan species such as Abietinaria abietina, Hydrallmania falcata and ... [details]

 Habitat

 for Amphiblestrum flemingii (Busk, 1854)

Occurs at a depth of between 0-70 m. [details]

 Habitat

 for Fabricia sabella (Ehrenberg, 1836)

In the intertidal and subtidal zone, between algae and ascidians.
This animal apparently is able to leave quite ... [details]

 Habitat

 for Glycera celtica O'Connor, 1987

Usually captured in muddy sand at a depth of between 50-200 m. [details]

 Habitat

 for Glycera oxycephala Ehlers, 1887

In gravel at a depth of between 10-150 m. [details]

 habitat

 for Harpinia antennaria Meinert, 1890

Generally observed at muddy bottoms at a depth of between 10-400 m. [details]

 Habitat

 for Nephtys assimilis Örsted, 1843

From the intertidal zone up to a depth of about 100 m, in more or less muddy but sandy sediments. [details]

 Habitat

 for Protodriloides chaetifer (Remane, 1926)

Prefers sand to gravel at the low with water saturated intertidal area up to the subtidal. [details]

 Habitat

 for Tanaopsis graciloides (Lilljeborg, 1864)

This species is commonly present at a depth of between 5-240 m in both gravel and fine sand, as well as muddy sand. [details]

 Identification

 for Glycera oxycephala Ehlers, 1887

This species has often been mistaken for G. gigantea Quatrefages, 1865 an G. capitata Oersted, 1843. [details]

 Identification

 for Nephtys assimilis Örsted, 1843

This species has often been mistaken for N. hombergii Savigny, 1818, which co-occur with N. assimilis, but the ... [details]