Adyte pellucida (Ehlers, 1864) accepted as Subadyte pellucida (Ehlers, 1864) (source of synonymy)
Ampharete finmarchica (M. Sars, 1865) (additional source)
Amphicteis gunneri (M. Sars, 1835) (additional source)
Amphitrite cirrata Müller, 1776 (additional source)
Aricidea simonae Laubier & Ramos, 1974 represented as Aricidea (Acmira) simonae Laubier & Ramos, 1974 (additional source)
Aricidea wassi Pettibone, 1965 represented as Aricidea (Aricidea) wassi Pettibone, 1965 (additional source)
Cirrophorus furcatus (Hartman, 1957) (additional source)
Dipolydora caulleryi (Mesnil, 1897) (additional source)
Dipolydora coeca (Örsted, 1843) (additional source)
Dipolydora giardi (Mesnil, 1893) (additional source)
Dipolydora socialis (Schmarda, 1861) (additional source)
Ditrupa arietina (O. F. Müller, 1776) (additional source)
Eunereis elitoralis (Eliason, 1962) (additional source)
Eunoe nodosa (M. Sars, 1861) (additional source)
Galathowenia oculata (Zachs, 1923) (basis of record)
Leitoscoloplos mammosus Mackie, 1987 (additional source)
Lumbrineris fragilis (O.F. Müller, 1776) accepted as Scoletoma fragilis (O.F. Müller, 1776) (source of synonymy)
Lumbrineris tetraura (Schmarda, 1861) accepted as Scoletoma tetraura (Schmarda, 1861) (source of synonymy)
Minuspio cirrifera (Wirén, 1883) accepted as Prionospio cirrifera Wirén, 1883 (source of synonymy)
Myriochele oculata Zachs, 1923 accepted as Galathowenia oculata (Zachs, 1923) (additional source)
Nematonereis unicornis Schmarda, 1861 accepted as Nematonereis unicornis (Grube, 1840) accepted as Lysidice unicornis (Grube, 1840) (additional source)
Odontosyllis gibba Claparède, 1863 (additional source)
Phyllodoce (Anaitides) groenlandica Örsted, 1842 represented as Phyllodoce groenlandica Örsted, 1842 (additional source)
Phylo norvegicus (M. Sars in G.O. Sars, 1872) accepted as Phylo norvegica (M. Sars in G.O. Sars, 1872) (additional source)
Platynereis dumerilii (Audouin & Milne Edwards, 1833) (additional source)
Polydora (Polydora) giardi Mesnil, 1893 accepted as Dipolydora giardi (Mesnil, 1893) (source of synonymy)
Protomystides bidentata (Langerhans, 1880) (source of synonymy)
Sabellides octocirrata (M. Sars, 1835) accepted as Ampharete octocirrata (Sars, 1835) (additional source)
Schistomeringos neglecta (Fauvel, 1923) (additional source)
Scoletoma fragilis (O.F. Müller, 1776) (additional source)
Scoletoma impatiens (Claparède, 1868) accepted as Scoletoma laurentiana (Grube, 1863) (additional source)
Spio armata (Thulin, 1957) (additional source)
Syllis armillaris (O.F. Müller, 1776) (additional source)
Tomopteris septentrionalis Steenstrup, 1849 (additional source)
Trochochaeta multisetosa (Örsted, 1844) (additional source)
Trypanosyllis coeliaca Claparède, 1868 accepted as Pseudosyllis brevipennis Grube, 1863 (additional source)
Typosyllis (Typosyllis) armillaris (O.F. Müller, 1776) accepted as Syllis armillaris (O.F. Müller, 1776) (source of synonymy)

 Authority

 for Eunoe nodosa (M. Sars, 1861)

Sars, 1861 [details]

 Authority

 for Tomopteris septentrionalis Steenstrup, 1849

Quatrefages, 1849 [details]

 Spelling

 for Phylo norvegicus (M. Sars in G.O. Sars, 1872)

Phylo norvegica (M. Sars, 1872) [details]

 Synonymy

 for Malmgrenia castanea McIntosh, 1876

Malmgrenia castanea is the correct combination, not Malmgreniella castanea [details]

 Synonymy

 for Prionospio malmgreni Claparède, 1869

Prionospio fallax Söderström, 1920 was considered to be a junior synonym of Prionospio malmgreni Claparède, 1869 ... [details]

 Synonymy

 for Sphaerodorum flavum Örsted, 1843

Sphaerodorum flavum could well be a synonym of Sphaerodorum gracilis [details]