Aeverrillia setigera (Hincks, 1887) (basis of record)
Anomia simplex A. d'Orbigny, 1853 (additional source)
Aplidium glabrum (Verrill, 1871) (additional source)
Asterias rubens Linnaeus, 1758 (additional source)
Autolytus cornutus Agassiz, 1862 accepted as Proceraea cornuta (Agassiz, 1862) (additional source)
Bostrichobranchus pilularis (Verrill, 1871) (additional source)
Botryllus schlosseri (Pallas, 1766) (additional source)
Bowerbankia gracilis Leidy, 1855 accepted as Amathia gracilis (Leidy, 1855) (additional source)
Bugula fulva Ryland, 1960 accepted as Bugulina fulva (Ryland, 1960) (additional source)
Bugula simplex Hincks, 1886 accepted as Bugulina simplex (Hincks, 1886) (additional source)
Callopora craticula (Alder, 1856) (additional source)
Cancer irroratus Say, 1817 (additional source)
Capitella capitata (Fabricius, 1780) (additional source)
Caprella penantis Leach, 1814 (additional source)
Carcinus maenas (Linnaeus, 1758) (additional source)
Celleporella hyalina (Linnaeus, 1767) (additional source)
Ciona intestinalis (Linnaeus, 1767) (additional source)
Clava multicornis (Forsskål, 1775) (additional source)
Clymenella torquata (Leidy, 1855) (additional source)
Clytia hemisphaerica (Linnaeus, 1767) (additional source)
Corophium insidiosum Crawford, 1937 accepted as Monocorophium insidiosum (Crawford, 1937) (additional source)
Crepidula plana Say, 1822 (additional source)
Crisia eburnea (Linnaeus, 1758) (additional source)
Dipolydora quadrilobata (Jacobi, 1883) (additional source)
Dosima fascicularis (Ellis & Solander, 1786) (additional source)
Ectopleura crocea (Agassiz, 1862) (additional source)
Enchytraeus albidus Henle, 1837 (additional source)
Ericthonius difformis H. Milne Edwards, 1830 (additional source)
Eudendrium capillare Alder, 1856 (additional source)
Eulalia viridis (Linnaeus, 1767) (additional source)
Gammarellus angulosus (Rathke, 1843) (additional source)
Geukensia demissa (Dillwyn, 1817) (additional source)
Glycera capitata Örsted, 1842 (additional source)
Gonionemus vertens A. Agassiz, 1862 (additional source)
Haliplanella lineata (Verrill, 1869) accepted as Diadumene lineata (Verrill, 1869) (additional source)
Halisarca dujardinii Johnston, 1842 (additional source)
Heteromastus filiformis (Claparède, 1864) (additional source)
Homarus americanus H. Milne Edwards, 1837 (additional source)
Hydroides dianthus (Verrill, 1873) (additional source)
Jassa marmorata Holmes, 1905 (additional source)
Laomedea flexuosa Alder, 1857 (additional source)
Lepas anatifera Linnaeus, 1758 represented as Lepas (Lepas) anatifera Linnaeus, 1758 (additional source)
Libinia dubia H. Milne Edwards, 1834 (additional source)
Marenzelleria viridis (Verrill, 1873) (additional source)
Mertensia ovum (Fabricius, 1780) (additional source)
Metridium senile (Linnaeus, 1761) (additional source)
Molgula citrina Alder & Hancock, 1848 (additional source)
Molgula manhattensis (De Kay, 1843) (additional source)
Myxicola infundibulum (Montagu, 1808) (additional source)
Nephtys ciliata (Müller, 1788) (additional source)
Nereis zonata Malmgren, 1867 (additional source)
Obelia geniculata (Linnaeus, 1758) (additional source)
Obelia longissima (Pallas, 1766) (additional source)
Orchestia gammarella (Pallas, 1766) accepted as Orchestia gammarellus (Pallas, 1766) (additional source)
Orchestia platensis Krøyer, 1845 accepted as Platorchestia platensis (Krøyer, 1845) (additional source)
Parougia caeca (Webster & Benedict, 1884) (additional source)
Petricolaria pholadiformis (Lamarck, 1818) (additional source)
Polydora ciliata (Johnston, 1838) (additional source)
Polydora cornuta Bosc, 1802 (additional source)
Praunus flexuosus (Müller, 1776) (additional source)
Protodorvillea Pettibone, 1961 (additional source)
Rhodine loveni Malmgren, 1865 (additional source)
Sabaco elongatus (Verrill, 1873) (additional source)
Streblospio benedicti Webster, 1879 (additional source)
Streptosyllis varians Webster & Benedict, 1887 (additional source)
Syllis gracilis Grube, 1840 (additional source)
Symplectoscyphus tricuspidatus (Alder, 1856) (additional source)
Tanystylum orbiculare Wilson, 1878 (additional source)
Tricellaria ternata (Ellis & Solander, 1786) (additional source)
Tubificoides benedii (d'Udekem, 1855) (additional source)
Urosalpinx cinerea (Say, 1822) (additional source)

United States part of the North Atlantic Ocean for Diadumene lineata (Verrill, 1869)  (origin: alien)
United States part of the North Atlantic Ocean for Gonionemus vertens A. Agassiz, 1862  (origin: alien)
United States part of the North Atlantic Ocean for Styela canopus (Savigny, 1816)  (origin: alien)