Abyssoninoe Orensanz, 1990 (additional source)
Abyssoninoe abyssorum (McIntosh, 1885) (basis of record)
Acanthicolepis McIntosh, 1900 (additional source)
Acanthicolepis asperrima (M. Sars, 1861) (additional source)
Acrocirrus Grube, 1873 (basis of record)
Acrocirrus frontifilis (Grube, 1860) (basis of record)
Aedicira Hartman, 1957 represented as Aricidea (Aedicira) Hartman, 1957 (basis of record)
Aedicira mediterranea Laubier & Ramos, 1974 accepted as Aricidea (Strelzovia) mediterranea (Laubier & Ramos, 1974) (basis of record)
Aglaophamus agilis (Langerhans, 1880) (basis of record)
Aglaophamus malmgreni (Théel, 1879) (basis of record)
Aglaophamus rubella (Michaelsen, 1897) accepted as Aglaophamus agilis (Langerhans, 1880) (basis of record)
Amaeana Hartman, 1959 (additional source)
Amage Malmgren, 1866 (additional source)
Amage auricula Malmgren, 1866 (basis of record)
Amagopsis Pergament & Khlebovich, 1964 accepted as Grubianella McIntosh, 1885 (additional source)
Amagopsis klugei Pergament & Khlebovich, 1964 accepted as Grubianella klugei (Pergament & Khlebovich, 1964) (additional source)
Ammotrypanella McIntosh, 1878 (basis of record)
Ampharete Malmgren, 1866 (additional source)
Ampharete acutifrons (Grube, 1860) (additional source)
Ampharete falcata Eliason, 1955 (basis of record)
Ampharete finmarchica (M. Sars, 1865) (basis of record)
Ampharete lindstroemi Hessle, 1917 (basis of record)
Amphicteis Grube, 1850 (additional source)
Amphicteis gunneri (M. Sars, 1835) (additional source)
Amphicteis ninonae Jirkov, 1985 (basis of record)
Amphiduros Hartman, 1959 (basis of record)
Amphitrite Müller, 1771 (additional source)
Amphitrite cirrata Müller, 1776 (basis of record)
Amythasides Eliason, 1955 (additional source)
Amythasides macroglossus Eliason, 1955 (basis of record)
Ancistargis Jones, 1961 accepted as Ancistrosyllis McIntosh, 1878 (basis of record)
Ancistrosyllis McIntosh, 1878 (additional source)
Ancistrosyllis fioronii Fiege & Böggemann, 1999 (basis of record)
Ancistrosyllis groenlandica McIntosh, 1878 (basis of record)
Anobothrus Levinsen, 1884 (additional source)
Anobothrus gracilis (Malmgren, 1866) (additional source)
Antonbruunia Hartman & Boss, 1966 (additional source)
Aonides Claparède, 1864 (additional source)
Aonides oxycephala (Sars, 1862) (basis of record)
Aonides paucibranchiata Southern, 1914 (basis of record)
Aphelochaeta Blake, 1991 (additional source)
Aphelochaeta marioni (Saint-Joseph, 1894) (basis of record)
Aphelochaeta serrata (Eliason, 1962) accepted as Kirkegaardia serrata (Eliason, 1962) (basis of record)
Aphrodita perarmata Roule, 1898 (basis of record)
Aphrogenia Kinberg, 1856 (basis of record)
Apistobranchus Levinsen, 1884 (additional source)
Apistobranchus tullbergi (Théel, 1879) (additional source)
Apomatus Philippi, 1844 (basis of record)
Apomatus similis Marion & Bobretzky, 1875 (basis of record)
Aponuphis Kucheruk, 1978 (additional source)
Aponuphis bilineata (Baird, 1870) (additional source)
Apoprionospio Foster, 1969 (additional source)
Apoprionospio pygmaea (Hartman, 1961) (basis of record)
Arabella geniculata (Claparède, 1868) (basis of record)
Arabella iricolor (Montagu, 1804) (basis of record)
Arenicola Lamarck, 1801 (additional source)
Aricidea Webster, 1879 (additional source)
Aricidea aberrans Laubier & Ramos, 1974 (basis of record)
Aricidea abranchiata Hartman, 1965 (basis of record)
Aricidea abyssalis Laubier & Ramos, 1974 represented as Aricidea (Strelzovia) abyssalis Laubier & Ramos, 1974 (basis of record)
Aricidea albatrossae Pettibone, 1957 represented as Aricidea (Aricidea) albatrossae Pettibone, 1957 (basis of record)
Aricidea catherinae Laubier, 1967 represented as Aricidea (Acmira) catherinae Laubier, 1967 (basis of record)
Aricidea cerrutii Laubier, 1966 represented as Aricidea (Acmira) cerrutii Laubier, 1966 (basis of record)
Aricidea fauveli Hartman, 1957 accepted as Aricidea (Acmira) lopezi Berkeley & Berkeley, 1956 (additional source)
Aricidea fragilis Webster, 1879 represented as Aricidea (Aricidea) fragilis Webster, 1879 (basis of record)
Aricidea hartmani Strelzov, 1968 (basis of record)
Aricidea minuta Southward, 1956 represented as Aricidea (Aricidea) minuta Southward, 1956 (basis of record)
Aricidea neosuecica Hartman, 1965 (additional source)
Aricidea quadrilobata Webster & Benedict, 1887 represented as Aricidea (Strelzovia) quadrilobata Webster & Benedict, 1887 (basis of record)
Aricidea roberti Hartley, 1983 represented as Aricidea (Strelzovia) roberti Hartley, 1984 (basis of record)
Aricidea simonae Laubier & Ramos, 1974 represented as Aricidea (Acmira) simonae Laubier & Ramos, 1974 (basis of record)
Aricidea suecica Eliason, 1920 represented as Aricidea (Strelzovia) suecica Eliason, 1920 (additional source)
Aricidea suecica simplex Day, 1963 accepted as Aricidea (Acmira) simplex Day, 1963 (additional source)
Aricidea trilobata Laubier & Ramos, 1974 accepted as Aricidea (Acmira) jeaneteae Langeneck, Busoni, Aliani & Castelli, 2017 (additional source)
Aricidea wassi Pettibone, 1965 represented as Aricidea (Aricidea) wassi Pettibone, 1965 (basis of record)
Armandia Filippi, 1861 (additional source)
Artacama Malmgren, 1866 (basis of record)
Artacama proboscidea Malmgren, 1866 (basis of record)
Asclerocheilus Ashworth, 1901 (basis of record)
Asclerocheilus intermedius (Saint-Joseph, 1894) (basis of record)
Auchenoplax Ehlers, 1887 (additional source)
Auchenoplax crinita Ehlers, 1887 (basis of record)
Augeneria Monro, 1930 (additional source)
Augeneria tentaculata Monro, 1930 (additional source)
Aurospio Maciolek, 1981 (additional source)
Aurospio dibranchiata Maciolek, 1981 (additional source)
Austrolaenilla mollis (Sars, 1872) (basis of record)
Autolytus Grube, 1850 accepted as Myrianida Milne Edwards, 1845 (additional source)
Autolytus rubrolineatus Gildhom, 1967 accepted as Myrianida irregularis (Imajima & Hartman, 1964) (basis of record)
Axionice Malmgren, 1866 (additional source)
Axionice flexuosa (Grube, 1860) (basis of record)
Axionice maculata (Dalyell, 1853) accepted as Pista maculata (Dalyell, 1853) (additional source)
Axiothella Verrill, 1900 (basis of record)
Bathyeliasona Pettibone, 1976 (additional source)
Bathyeliasona abyssicola (Fauvel, 1913) (additional source)
Bathyeliasona kirkegaardi (Uschakov, 1971) (basis of record)
Bathyfauvelia Pettibone, 1976 (additional source)
Bathyfauvelia affinis (Fauvel, 1914) (basis of record)
Bathyvermilia Zibrowius, 1973 (basis of record)
Bathyvermilia langerhansi (Fauvel, 1909) (basis of record)

European waters (ERMS scope) for Abyssoninoe abyssorum (McIntosh, 1885) 
European waters (ERMS scope) for Abyssoninoe scopa (Fauchald, 1974) 
European waters (ERMS scope) for Acanthicolepis asperrima (M. Sars, 1861) 
European waters (ERMS scope) for Acrocirrus frontifilis (Grube, 1860) 
European waters (ERMS scope) for Aedicira mediterranea Laubier & Ramos, 1974 
European waters (ERMS scope) for Aglaophamus agilis (Langerhans, 1880) 
European waters (ERMS scope) for Aglaophamus malmgreni (Théel, 1879) 
European waters (ERMS scope) for Aglaophamus rubella (Michaelsen, 1897) 
European waters (ERMS scope) for Alentiana aurantiaca (Verrill, 1885) 
European waters (ERMS scope) for Amage auricula Malmgren, 1866 
European waters (ERMS scope) for Amagopsis klugei Pergament & Khlebovich, 1964 
European waters (ERMS scope) for Ammotrypanella arctica (McIntosh in Jeffreys, 1876) 
European waters (ERMS scope) for Ampharete acutifrons (Grube, 1860) 
European waters (ERMS scope) for Ampharete falcata Eliason, 1955 
European waters (ERMS scope) for Ampharete finmarchica (M. Sars, 1865) 
European waters (ERMS scope) for Ampharete lindstroemi Hessle, 1917 
European waters (ERMS scope) for Amphicteis gunneri (M. Sars, 1835) 
European waters (ERMS scope) for Amphicteis ninonae Jirkov, 1985 
European waters (ERMS scope) for Amphitrite cirrata Müller, 1776 
European waters (ERMS scope) for Amythasides macroglossus Eliason, 1955 
European waters (ERMS scope) for Ancistrosyllis fioronii Fiege & Böggemann, 1999 
European waters (ERMS scope) for Ancistrosyllis groenlandica McIntosh, 1878 
European waters (ERMS scope) for Anobothrus gracilis (Malmgren, 1866) 
European waters (ERMS scope) for Aonides oxycephala (Sars, 1862) 
European waters (ERMS scope) for Aonides paucibranchiata Southern, 1914 
European waters (ERMS scope) for Aphelochaeta Blake, 1991 
European waters (ERMS scope) for Aphelochaeta marioni (Saint-Joseph, 1894) 
European waters (ERMS scope) for Aphelochaeta serrata (Eliason, 1962) 
European waters (ERMS scope) for Aphrodita aculeata Linnaeus, 1758  (doubtful)
European waters (ERMS scope) for Aphrodita alta Kinberg, 1856 
European waters (ERMS scope) for Aphrodita perarmata Roule, 1898 
European waters (ERMS scope) for Apistobranchus tullbergi (Théel, 1879) 
European waters (ERMS scope) for Apomatus similis Marion & Bobretzky, 1875 
European waters (ERMS scope) for Apoprionospio pygmaea (Hartman, 1961) 
European waters (ERMS scope) for Arabella geniculata (Claparède, 1868) 
European waters (ERMS scope) for Arabella iricolor (Montagu, 1804) 
European waters (ERMS scope) for Aricidea aberrans Laubier & Ramos, 1974 
European waters (ERMS scope) for Aricidea abranchiata Hartman, 1965 
European waters (ERMS scope) for Aricidea abyssalis Laubier & Ramos, 1974 
European waters (ERMS scope) for Aricidea albatrossae Pettibone, 1957 
European waters (ERMS scope) for Aricidea catherinae Laubier, 1967 
European waters (ERMS scope) for Aricidea cerrutii Laubier, 1966 
European waters (ERMS scope) for Aricidea fauveli Hartman, 1957 
European waters (ERMS scope) for Aricidea hartmani Strelzov, 1968 
European waters (ERMS scope) for Aricidea minuta Southward, 1956 
European waters (ERMS scope) for Aricidea neosuecica Hartman, 1965 
European waters (ERMS scope) for Aricidea quadrilobata Webster & Benedict, 1887 
European waters (ERMS scope) for Aricidea roberti Hartley, 1983 
European waters (ERMS scope) for Aricidea simonae Laubier & Ramos, 1974 
European waters (ERMS scope) for Aricidea suecica simplex Day, 1963 
European waters (ERMS scope) for Aricidea trilobata Laubier & Ramos, 1974 
European waters (ERMS scope) for Aricidea wassi Pettibone, 1965 
European waters (ERMS scope) for Artacama proboscidea Malmgren, 1866 
European waters (ERMS scope) for Asclerocheilus intermedius (Saint-Joseph, 1894) 
European waters (ERMS scope) for Auchenoplax crinita Ehlers, 1887 
European waters (ERMS scope) for Augeneria tentaculata Monro, 1930 
European waters (ERMS scope) for Aurospio dibranchiata Maciolek, 1981 
European waters (ERMS scope) for Austrolaenilla mollis (Sars, 1872) 
European waters (ERMS scope) for Autolytus rubrolineatus Gildhom, 1967 
European waters (ERMS scope) for Axionice flexuosa (Grube, 1860) 
European waters (ERMS scope) for Axionice maculata (Dalyell, 1853) 
European waters (ERMS scope) for Bathyeliasona abyssicola (Fauvel, 1913) 
European waters (ERMS scope) for Bathyeliasona kirkegaardi (Uschakov, 1971) 
European waters (ERMS scope) for Bathyfauvelia affinis (Fauvel, 1914) 
European waters (ERMS scope) for Bhawania reyssi Katzmann, Laubier & Ramos, 1974 
European waters (ERMS scope) for Brada villosa (Rathke, 1843) 
European waters (ERMS scope) for Branchiomma bombyx (Dalyell, 1853) 
European waters (ERMS scope) for Branchiomma lucullanum (Delle Chiaje, 1828) 
European waters (ERMS scope) for Bylgides groenlandicus (Malmgren, 1867) 
European waters (ERMS scope) for Bylgides promamme (Malmgren, 1867) 
European waters (ERMS scope) for Bylgides sarsi (Kinberg in Malmgren, 1866) 
European waters (ERMS scope) for Capitella capitata (Fabricius, 1780) 
European waters (ERMS scope) for Capitella minima Langerhans, 1880 
European waters (ERMS scope) for Caulleriella alata (Southern, 1914) 
European waters (ERMS scope) for Caulleriella bioculata (Keferstein, 1862) 
European waters (ERMS scope) for Caulleriella killariensis (Southern, 1914) 
European waters (ERMS scope) for Ceratocephale loveni Malmgren, 1867 
European waters (ERMS scope) for Ceratonereis anoculata Amoureux, 1982 
European waters (ERMS scope) for Chaetoparia nilssoni Malmgren, 1867 
European waters (ERMS scope) for Chaetopterus variopedatus (Renier, 1804) 
European waters (ERMS scope) for Chaetozone benthaliana McIntosh, 1885 
European waters (ERMS scope) for Chaetozone caputesocis (Saint-Joseph, 1894) 
European waters (ERMS scope) for Chaetozone setosa Malmgren, 1867 
European waters (ERMS scope) for Chirimia biceps (M. Sars, 1861) 
European waters (ERMS scope) for Chitinopoma serrula (Stimpson, 1853) 
European waters (ERMS scope) for Chloeia venusta Quatrefages, 1866 
European waters (ERMS scope) for Chloeia viridis Schmarda, 1861 
European waters (ERMS scope) for Chloenopsis atlantica (McIntosh, 1885) 
European waters (ERMS scope) for Chone duneri Malmgren, 1867 
European waters (ERMS scope) for Chone filicaudata Southern, 1914 
European waters (ERMS scope) for Chone infundibuliformis Krøyer, 1856 
European waters (ERMS scope) for Chone longocirrata M. Sars in G.O. Sars, 1872 
European waters (ERMS scope) for Chrysopetalum debile (Grube, 1855) 
European waters (ERMS scope) for Circeis spirillum (Linnaeus, 1758) 
European waters (ERMS scope) for Cirratulus cirratus (O. F. Müller, 1776) 
European waters (ERMS scope) for Cirrophorus branchiatus Ehlers, 1908 
European waters (ERMS scope) for Cirrophorus furcatus (Hartman, 1957) 
European waters (ERMS scope) for Clavodorum fauchaldi Desbruyères, 1980 
European waters (ERMS scope) for Clymenella torquata (Leidy, 1855) 
European waters (ERMS scope) for Clymenura borealis (Arwidsson, 1906) 

 Classification

 for Zeppelina monostyla (Zeppelin, 1883)

family position uncertain [details]

 Editor's comment

 for Polaruschakov polaris (Uschakov, 1957)

Data-entry error corrected. Original publication date of the recombined name was incorrectly originally ... [details]

 Publication date

 for Notocirrus arcachonis Quatrefages, 1873

Prior to 2017 the publication date was recorded here as 1843. This was incorrect. Although Quatrefages published in ... [details]

 Spelling

 for Autolytus syllisetosus Langerhans, 1884

Genus name mispelled as 'Autolitus' in printed version [details]

 Spelling

 for Eunereis elitoralis (Eliason, 1962)

Eliason's original spelling of 'littoral' was a variant spelling of the word with only one 'l'. Bellan's (2001) ... [details]

 Spelling

 for Lumbrineriopsis magnidendata [lapsus for original Lumbrineris magnidentata]

Spelling error of no significance for the species name produced in a checklist (Bellan, 2001: 219), and it seems ... [details]

 Spelling

 for Typhloscolex phylloides [auct misspelling of phyllodes]

A checklist usage (Bellan 2001: 231) as "phylloides Reibich, 1895" which is a misspelling of both the species name ... [details]

 Taxonomy

 for Glyphohesione Friedrich, 1950

Listed in ERMS V1 also under family Hesionidae, with same species [details]

 Taxonomy

 for Notoproctus Arwidsson, 1906

Listed in ERMS V1 also under family Capitellidae (Polychaeta), with same species [details]

 Taxonomy

 for Notoproctus oculatus Arwidsson, 1906

?= Notoproctus oculatus Arwidsson, 1907, Maldanidae [details]