Amaeana trilobata (Sars, 1863) (additional source)
Ampharete finmarchica (M. Sars, 1865) (additional source)
Amphicteis gunneri (M. Sars, 1835) (additional source)
Amphitrite cirrata Müller, 1776 (additional source)
Antinoella sarsi (Kinberg in Malmgren, 1866) accepted as Bylgides sarsi (Kinberg in Malmgren, 1866) (additional source)
Cirrophorus furcatus (Hartman, 1957) (additional source)
Dipolydora caulleryi (Mesnil, 1897) (additional source)
Dipolydora coeca (Örsted, 1843) (additional source)
Dipolydora quadrilobata (Jacobi, 1883) (additional source)
Dipolydora socialis (Schmarda, 1861) (additional source)
Ditrupa arietina (O. F. Müller, 1776) (additional source)
Eunoe nodosa (M. Sars, 1861) (additional source)
Galathowenia oculata (Zachs, 1923) (basis of record)
Harmothoe nodosa (M. Sars, 1861) accepted as Eunoe nodosa (M. Sars, 1861) (basis of record)
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)
Phyllodoce (Anaitides) groenlandica Örsted, 1842 represented as Phyllodoce groenlandica Örsted, 1842 (additional source)
Platynereis dumerilii (Audouin & Milne Edwards, 1833) (additional source)
Polydora (Polydora) quadrilobata Jacobi, 1883 accepted as Dipolydora quadrilobata (Jacobi, 1883) (source of synonymy)
Polydora ligni Webster, 1879 accepted as Polydora cornuta Bosc, 1802 (source of synonymy)
Sabellides octocirrata (M. Sars, 1835) accepted as Ampharete octocirrata (Sars, 1835) (additional source)
Scoletoma fragilis (O.F. Müller, 1776) (additional source)
Scoletoma impatiens (Claparède, 1868) accepted as Scoletoma laurentiana (Grube, 1863) (additional source)
Syllis armillaris (O.F. Müller, 1776) (additional source)
Tomopteris septentrionalis Steenstrup, 1849 (additional source)
Trochochaeta multisetosa (Örsted, 1844) (additional source)

 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]