Ampharete gracilis Malmgren, 1866 accepted as Anobothrus gracilis (Malmgren, 1866) (source of synonymy)
Anaitides maculata (Linnaeus, 1767) accepted as Phyllodoce maculata (Linnaeus, 1767) (basis of record)
Aricidea jeffreysi [auctt.] accepted as Aricidea jeffreysii [Auctt. (Non McIntosh, 1879)] accepted as Aricidea (Acmira) cerrutii Laubier, 1966 (basis of record)
Artacama proboscidea Malmgren, 1866 (additional source)
Autolytus lugens mediterraneus Cognetti, 1953 accepted as Myrianida quindecimdentata (Langerhans, 1884) (source of synonymy)
Autolytus quindecimdentatus Langerhans, 1884 accepted as Myrianida quindecimdentata (Langerhans, 1884) (additional source)
Calamyzinae Hartmann-Schröder, 1971 (original description)
Clymenura borealis (Arwidsson, 1906) (additional source)
Errantia (additional source)
Eteone flava (Fabricius, 1780) (additional source)
Eteone fucata M. Sars in G.O. Sars, 1872 accepted as Eteone flava (Fabricius, 1780) (source of synonymy)
Eteone lactea Claparède, 1868 accepted as Hypereteone lactea (Claparède, 1868) (basis of record)
Eumida fusigera (Malmgren, 1865) accepted as Sige fusigera Malmgren, 1865 (additional source)
Euzonus flabelliferus (Ziegelmeier, 1955) accepted as Thoracophelia flabellifera Ziegelmeier, 1955 (basis of record)
Exogone (Exogone) dispar (Webster, 1879) accepted as Exogone dispar (Webster, 1879) (additional source)
Fabricia stellaris stellaris (O. F. Müller, 1774) (additional source)
Gyptis rosea (Malm, 1874) accepted as Neogyptis rosea (Malm, 1874) (taxonomy source)
Harmothoe micraspis Eliason, 1962 (additional source)
Hesioninae Grube, 1850 (status source)
Hesionura augeneri (Friedrich, 1937) accepted as Hesionura elongata (Southern, 1914) (additional source)
Jugaria Knight-Jones, 1978 represented as Bushiella (Jugaria) Knight-Jones, 1978 (additional source)
Lanassa venusta (Malm, 1874) (additional source)
Macellicephalinae Hartmann-Schröder, 1971 (original description)
Microphthalmidae Hartmann-Schröder, 1971 (original description)
Microphthalmus aberrans (Webster & Benedict, 1887) (additional source)
Microphthalmus sczelkowii cantabrica Rioja, 1925 accepted as Microphthalmus aberrans (Webster & Benedict, 1887) (source of synonymy)
Mysta picta (Quatrefages, 1866) (basis of record)
Nereis (Eunereis) elitoralis Eliason, 1962 accepted as Nereis elitoralis Eliason, 1962 (new combination reference)
Nereis irrorata (Malmgren, 1867) accepted as Neanthes nubila (Savigny, 1822) (source of synonymy)
Odontosyllis ctenostoma Claparède, 1868 (additional source)
Onuphis quadricuspis M. Sars in G.O. Sars, 1872 accepted as Paradiopatra quadricuspis (M. Sars in G.O. Sars, 1872) (source of synonymy)
Ophelia cluthensis McGuire, 1935 accepted as Ophelia rathkei McIntosh, 1908 (status source)
Opheliidae Malmgren, 1867 (taxonomy source)
Ophelininae Hartmann-Schröder, 1971 (original description)
Paedophylax dispar Webster, 1879 accepted as Exogone dispar (Webster, 1879) (basis of record)
Paedophylax dispar Webster, 1879 accepted as Exogone dispar (Webster, 1879) (source of synonymy)
Paradoneis armata Glémarec, 1966 (additional source)
Paraonis gracilis (Tauber, 1879) accepted as Levinsenia gracilis (Tauber, 1879) (basis of record)
Parophryotrocha Hartmann-Schröder, 1971 (original description)
Parophryotrocha isochaeta (Eliason, 1962) (basis of record)
Pirakia Bergström, 1914 accepted as Eumida Malmgren, 1865 (additional source)
Polydora caeca (Örsted, 1843) accepted as Dipolydora coeca (Örsted, 1843) (additional source)
Polydora saintjosephi Eliason, 1920 accepted as Dipolydora saintjosephi (Eliason, 1920) (source of synonymy)
Pterosyllis formosa Claparède, 1863 accepted as Amblyosyllis spectabilis (Johnston in Baird, 1861) (new combination reference)
Raphidrilinae Hartmann-Schröder, 1971 (original description)
Scalibregmidae Malmgren, 1867 accepted as Scalibregmatidae Malmgren, 1867 (additional source)
Sedentaria (additional source)
Sosane gracilis (Malmgren, 1866) accepted as Anobothrus gracilis (Malmgren, 1866) (basis of record)
Sthenelais jeffreysii [auctt. misspelling for jeffreysi] accepted as Sthenelais jeffreysi McIntosh, 1876 (additional source)
Thoracophelia flabellifera Ziegelmeier, 1955 (source of synonymy)
Travisiidae Hartmann-Schröder, 1971 (original description)
Wilsoniella Pettibone, 1993 accepted as Pettibonesia Nemésio, 2006 (additional source)