Aglaophamus malmgreni (Théel, 1879) (additional source)
Aglaophamus rubella (Michaelsen, 1897) accepted as Aglaophamus agilis (Langerhans, 1880) (additional source)
Ampharete acutifrons (Grube, 1860) (additional source)
Ampharete baltica Eliason, 1955 (additional source)
Ampharete falcata Eliason, 1955 (additional source)
Ampharete grubei Malmgren, 1865 (source of synonymy)
Ampharetinae Malmgren, 1866 (basis of record)
Amphicteis midas (Gosse, 1855) (additional source)
Amphicteis sundevalli Malmgren, 1866 (additional source)
Amphictene auricoma (O.F. Müller, 1776) (basis of record)
Amphictene auricoma (O.F. Müller, 1776) (source of synonymy)
Anaitides Czerniavsky, 1882 accepted as Phyllodoce Lamarck, 1818 (source of synonymy)
Anaitides groenlandica (Örsted, 1842) accepted as Phyllodoce groenlandica Örsted, 1842 (additional source)
Anaitides lineata (Claparède, 1870) accepted as Phyllodoce lineata (Claparède, 1870) (status source)
Anaitides longipes (Kinberg, 1866) accepted as Phyllodoce longipes Kinberg, 1866 (basis of record)
Anaitides longipes (Kinberg, 1866) accepted as Phyllodoce longipes Kinberg, 1866 (source of synonymy)
Anaitides maculata (Linnaeus, 1767) accepted as Phyllodoce maculata (Linnaeus, 1767) (additional source)
Anaitides mucosa (Örsted, 1843) accepted as Phyllodoce mucosa Örsted, 1843 (source of synonymy)
Anaitides rosea (McIntosh, 1877) accepted as Phyllodoce rosea (McIntosh, 1877) (basis of record)
Anobothrus gracilis (Malmgren, 1866) (additional source)
Aonides paucibranchiata Southern, 1914 (additional source)
Aphelochaeta multibranchis (Grube, 1863) (new combination reference)
Aphelochaeta vivipara (Christie, 1984) accepted as Chaetozone vivipara (Christie, 1984) (new combination reference)
Apistobranchus tenuis Orrhage, 1962 (additional source)
Apistobranchus tullbergi (Théel, 1879) (additional source)
Aricidea catherinae Laubier, 1967 represented as Aricidea (Acmira) catherinae Laubier, 1967 (additional source)
Aricidea cerrutii Laubier, 1966 represented as Aricidea (Acmira) cerrutii Laubier, 1966 (additional source)
Aricidea suecica Eliason, 1920 represented as Aricidea (Strelzovia) suecica Eliason, 1920 (additional source)
Autolytus edwardsii Saint Joseph, 1887 accepted as Myrianida edwarsi (Saint Joseph, 1887) (additional source)
Autolytus quinquedecimdentatus [auct. misspelling] accepted as Myrianida quindecimdentata (Langerhans, 1884) (basis of record)
Axionice maculata (Dalyell, 1853) accepted as Pista maculata (Dalyell, 1853) (additional source)
Brada villosa (Rathke, 1843) accepted as Bradabyssa villosa (Rathke, 1843) (additional source)
Capitomastus minimus (Langerhans, 1880) accepted as Capitella minima Langerhans, 1880 (additional source)
Caulleriella alata (Southern, 1914) (additional source)
Caulleriella bioculata parva Gillandt, 1979 accepted as Caulleriella parva Gillandt, 1979 (status source)
Caulleriella parva Gillandt, 1979 (new combination reference)
Chaetoparia Malmgren, 1867 (additional source)
Cirratulus cirratus (O. F. Müller, 1776) (additional source)
Cossura longocirrata Webster & Benedict, 1887 (additional source)
Ctenodrilidae Kennel, 1882 accepted as Ctenodrilinae Kennel, 1882 (status source)
Diplocirrus glaucus (Malmgren, 1867) (additional source)
Dorvillea erucaeformis (Malmgren, 1865) (additional source)
Drilonereis filum (Claparède, 1868) (additional source)
Dysponetus paleophorus Hartmann-Schröder, 1974 (additional source)
Eclysippe vanelli (Fauvel, 1936) (additional source)
Ephesiella peripatus [Auctt. not Johnston, 1845] accepted as Ephesiella abyssorum (Hansen, 1878) (additional source)
Eteone Savigny, 1822 (additional source)
Eteone (Mysta) Malmgren, 1865 (basis of record)
Eteone (Mysta) barbata (Malmgren, 1865) accepted as Eteone barbata (Malmgren, 1865) accepted as Mysta barbata Malmgren, 1865 (additional source)
Eteone flava (Fabricius, 1780) (additional source)
Eteone foliosa Quatrefages, 1866 accepted as Hypereteone foliosa (Quatrefages, 1865) (additional source)
Eteone fucata M. Sars in G.O. Sars, 1872 accepted as Eteone flava (Fabricius, 1780) (additional source)
Eteone lactea Claparède, 1868 accepted as Hypereteone lactea (Claparède, 1868) (source of synonymy)
Eteone longa (Fabricius, 1780) (additional source)
Eteone picta Quatrefages, 1866 accepted as Mysta picta (Quatrefages, 1866) (additional source)
Eteone spetsbergensis Malmgren, 1865 (additional source)
Eteone suecica Bergström, 1914 (additional source)
Eteoninae Bergström, 1914 (basis of record)
Euchone analis (Krøyer, 1856) (additional source)
Eucranta villosa Malmgren, 1865 (additional source)
Eulalia Savigny, 1822 (additional source)
Eulalia bilineata (Johnston, 1840) (additional source)
Eulalia expusilla Pleijel, 1987 (additional source)
Eulalia mustela Pleijel, 1987 (additional source)
Eumida Malmgren, 1865 (additional source)
Eumida bahusiensis Bergstrom, 1914 (additional source)
Eunice pennata (Müller, 1776) (additional source)
Eupolymnia nebulosa (Montagu, 1819) (additional source)
Eupolymnia nesidensis (Delle Chiaje, 1828) (additional source)
Euzonus flabelligerus [Auctt.] accepted as Thoracophelia flabellifera Ziegelmeier, 1955 (additional source)
Exogone (Exogone) verugera (Claparède, 1868) accepted as Exogone verugera (Claparède, 1868) (additional source)
Exogone (Parexogone) hebes (Webster & Benedict, 1884) accepted as Parexogone hebes (Webster & Benedict, 1884) (additional source)
Galathowenia oculata (Zachs, 1923) (additional source)
Gattyana cirrosa (Pallas, 1766) accepted as Gattyana cirrhosa (Pallas, 1766) (basis of record)
Genetyllis lutea Malmgren, 1865 accepted as Nereiphylla lutea (Malmgren, 1865) (source of synonymy)
Glycera alba (O.F. Müller, 1776) (additional source)
Glycera gigantea Quatrefages, 1866 accepted as Glycera fallax Quatrefages, 1850 (additional source)
Glycera lapidum Quatrefages, 1866 (additional source)
Glycera rouxii Audouin & Milne Edwards, 1833 accepted as Glycera unicornis Lamarck, 1818 (additional source)
Glycera tridactyla Schmarda, 1861 (additional source)
Glycinde nordmanni (Malmgren, 1866) (additional source)
Goniada norvegica Örsted, 1845 (additional source)
Goniadella bobretzkii accepted as Goniadella bobrezkii (Annenkova, 1929) (additional source)
Goniadella bobrezkii (Annenkova, 1929) (additional source)
Halosydna gelatinosa (Sars, 1835) accepted as Alentia gelatinosa (M. Sars, 1835) (source of synonymy)
Harmothoe (Antinoella) Augener, 1928 accepted as Bylgides Chamberlin, 1919 (additional source)
Harmothoe (Antinoella) sarsi (Kinberg in Malmgren, 1866) accepted as Bylgides sarsi (Kinberg in Malmgren, 1866) (basis of record)
Harmothoe (Antinoella) sarsi promamme (Malmgren, 1867) accepted as Bylgides promamme (Malmgren, 1867) (basis of record)
Harmothoe (Antinoella) sarsi sarsi (Kinberg, 1865) (basis of record)
Harmothoe (Harmothoe) Kinberg, 1856 accepted as Harmothoe Kinberg, 1856 (basis of record)
Harmothoe (Harmothoe) glabra (Malmgren, 1866) accepted as Harmothoe glabra (Malmgren, 1865) (basis of record)
Harmothoe andreapolis (McIntosh, 1874) accepted as Malmgrenia andreapolis McIntosh, 1874 (basis of record)
Harmothoe andreapolis (McIntosh, 1874) accepted as Malmgrenia andreapolis McIntosh, 1874 (source of synonymy)
Harmothoe antilopes McIntosh, 1876 (additional source)
Harmothoe borealis (Théel, 1879) (additional source)
Harmothoe castanea (McIntosh, 1876) accepted as Malmgrenia castanea McIntosh, 1876 (source of synonymy)
Harmothoe fragilis Moore, 1910 (additional source)
Harmothoe imbricata (Linnaeus, 1767) (additional source)
Harmothoe impar (Johnston, 1839) (additional source)
Harmothoe lunulata (Delle Chiaje, 1830) accepted as Malmgrenia lunulata (Delle Chiaje, 1830) (basis of record)

 Classification

 for Calamyzas amphictenicola Arwidsson, 1932

Calamyzas amphictenicola is a parasite that was originally placed as a syllid or later as Calamyzinae subfamily in ... [details]