Aglaophamus verrilli (McIntosh, 1885) (additional source)
Amastigos caperatus Ewing & Dauer, 1981 (basis of record)
Amphicteis floridus Hartman, 1951 accepted as Hobsonia florida (Hartman, 1951) (additional source)
Amphitrite cirrata Müller, 1776 (additional source)
Amphitrite figulus (Dalyell, 1853) represented as Neoamphitrite figulus (Dalyell, 1853) (additional source)
Amphitrite ornata (Leidy, 1855) (additional source)
Apistobranchus tullbergi (Théel, 1879) (additional source)
Arenicola brasiliensis Nonato, 1958 (basis of record)
Arenicola cristata Stimpson, 1856 (additional source)
Asabellides oculata (Webster, 1879) accepted as Ampharete oculata (Webster, 1879) (additional source)
Autolytus prismaticus (O.F. Müller, 1776) accepted as Proceraea prismatica (O.F. Müller, 1776) (additional source)
Chaetopterus variopedatus (Renier, 1804) (additional source)
Chaetozone setosa Malmgren, 1867 (additional source)
Cirratulus cirratus (O. F. Müller, 1776) (additional source)
Cirratulus grandis Verrill, 1873 accepted as Cirriformia grandis (Verrill, 1873) (basis of record)
Clymenella torquata (Leidy, 1855) (additional source)
Clymenella zonalis (Verrill, 1874) (basis of record)
Demonax microphthalmus (Verrill, 1873) accepted as Parasabella microphthalma (Verrill, 1873) (basis of record)
Diopatra cuprea (Bosc, 1802) (basis of record)
Dodecaceria concharum Örsted, 1843 (additional source)
Dodecaceria coralii (Leidy, 1855) (basis of record)
Drilonereis longa Webster, 1879 (basis of record)
Enoplobranchus sanguineus (Verrill, 1873) (additional source)
Ephesiella minuta (Webster & Benedict, 1887) accepted as Sphaerodoropsis minuta (Webster & Benedict, 1887) accepted as Sphaerodoridium minutum (Webster & Benedict, 1887) (additional source)
Eteone heteropoda Hartman, 1951 accepted as Hypereteone heteropoda (Hartman, 1951) (additional source)
Eteone lactea Claparède, 1868 accepted as Hypereteone lactea (Claparède, 1868) (additional source)
Eteone trilineata Webster & Benedict, 1887 (additional source)
Eunice norvegica (Linnaeus, 1767) (additional source)
Exogone (Exogone) dispar (Webster, 1879) accepted as Exogone dispar (Webster, 1879) (additional source)
Fabricia sabella (Ehrenberg, 1836) accepted as Fabricia stellaris (Müller, 1774) (additional source)
Filograna implexa Berkeley, 1835 (additional source)
Gattyana cirrosa (Pallas, 1766) accepted as Gattyana cirrhosa (Pallas, 1766) (additional source)
Glycera dibranchiata Ehlers, 1868 (additional source)
Glycinde solitaria (Webster, 1879) accepted as Glycinde multidens Müller, 1858 (additional source)
Harmothoe extenuata (Grube, 1840) (additional source)
Harmothoe imbricata (Linnaeus, 1767) (additional source)
Hydroides dianthus (Verrill, 1873) (additional source)
Janua (Dexiospira) spirillum (Linnaeus, 1758) accepted as Circeis spirillum (Linnaeus, 1758) (additional source)
Lepidasthenia commensalis (Webster, 1879) accepted as Lepidametria commensalis Webster, 1879 (additional source)
Lepidonotus squamatus (Linnaeus, 1758) (additional source)
Lepidonotus sublevis Verrill, 1873 (additional source)
Loimia medusa (Savigny, 1822) (additional source)
Lumbrinereis acicularum Webster & Benedict, 1887 accepted as Scoletoma acicularum (Webster & Benedict, 1887) (additional source)
Lumbrineris brevipes (McIntosh, 1903) accepted as Paraninoe brevipes (McIntosh, 1903) (basis of record)
Lumbrineris tenuis Verrill, 1873 accepted as Scoletoma tenuis (Verrill, 1873) (additional source)
Maldane sarsi Malmgren, 1865 (additional source)
Marphysa bellii (Audouin & Milne Edwards, 1833) accepted as Paucibranchia bellii (Audouin & Milne Edwards, 1833) (additional source)
Marphysa sanguinea (Montagu, 1813) (additional source)
Naineris quadricuspida (Fabricius, 1780) (additional source)
Neanthes acuminata (Ehlers, 1868) (additional source)
Nemidia torelli Malmgren, 1865 accepted as Enipo torelli (Malmgren, 1865) (additional source)
Nephtys bucera Ehlers, 1868 (additional source)
Nephtys caeca (Fabricius, 1780) (additional source)
Nephtys ciliata (Müller, 1788) (additional source)
Nephtys picta Ehlers, 1868 (additional source)
Nereis (Hediste) diversicolor O.F. Müller, 1776 accepted as Hediste diversicolor (O.F. Müller, 1776) (additional source)
Odontosyllis fulgurans (Audouin & Milne Edwards, 1833) (additional source)
Onuphis quadricuspis M. Sars in G.O. Sars, 1872 accepted as Paradiopatra quadricuspis (M. Sars in G.O. Sars, 1872) (additional source)
Ophelia bicornis Savigny, 1822 (additional source)
Ophelia denticulata Verrill, 1875 (additional source)
Orbinia riseri (Pettibone, 1957) (basis of record)
Paranaitis speciosa (Webster, 1879) (additional source)
Paraonis fulgens (Levinsen, 1884) (additional source)
Paraprionospio pinnata (Ehlers, 1901) (additional source)
Pectinaria gouldi (Verrill, 1873) accepted as Pectinaria gouldii (Verrill, 1873) (additional source)
Podarke obscura Verrill, 1873 accepted as Oxydromus obscurus (Verrill, 1873) (additional source)
Podarkeopsis Laubier, 1961 (additional source)
Polycirrus eximius (Leidy, 1855) (additional source)
Polycirrus phosphoreus Verrill, 1879 (basis of record)
Polydora (Polydora) socialis (Schmarda, 1861) accepted as Dipolydora socialis (Schmarda, 1861) (additional source)
Polydora ligni Webster, 1879 accepted as Polydora cornuta Bosc, 1802 (additional source)
Prionospio heterobranchia Moore, 1907 (basis of record)
Pygospio elegans Claparède, 1863 (additional source)
Sabellaria vulgaris Verrill, 1873 (additional source)
Scoloplos armiger (Müller, 1776) (additional source)
Spio filicornis (Müller, 1776) (additional source)
Spio setosa Verrill, 1873 (additional source)
Spiophanes bombyx (Claparède, 1870) (additional source)
Spirorbis borealis Daudin, 1800 accepted as Spirorbis (Spirorbis) spirorbis (Linnaeus, 1758) (additional source)
Spirorbis granulatus (Linnaeus, 1767) accepted as Bushiella (Jugaria) granulata (Linnaeus, 1767) accepted as Janua heterostropha (Montagu, 1803) (basis of record)
Spirorbis violaceus Levinsen, 1883 accepted as Paradexiospira violaceus (Levinsen, 1883) represented as Paradexiospira (Paradexiospira) violacea (Levinsen, 1883) (basis of record)
Streblospio benedicti Webster, 1879 (additional source)
Syllis spongiphila Verrill, 1885 accepted as Haplosyllis spongiphila (Verrill, 1885) (basis of record)
Tharyx acutus Webster & Benedict, 1887 (additional source)
Tharyx setigera Hartman, 1945 accepted as Tharyx acutus Webster & Benedict, 1887 (basis of record)
Tomopteris septentrionalis Steenstrup, 1849 (additional source)
Travisia carnea Verrill, 1873 (additional source)

English American tube-dwelling anemone for Ceriantheopsis americana (Agassiz in Verrill, 1864)
English ceriantharian anemone for Ceriantheopsis americana (Agassiz in Verrill, 1864)
English northern stony coral [from synonym] for Astrangia astreiformis Milne Edwards & Haime, 1849
English southern cerianthid for Ceriantheopsis americana (Agassiz in Verrill, 1864)
English star coral [from synonym] for Astrangia astreiformis Milne Edwards & Haime, 1849
English yellow flabby-sponge for Mycale (Carmia) fibrexilis (Wilson, 1894)