Abra lioica (Dall, 1881) (habitat flag source)
Acanthephyra acutifrons Spence Bate, 1888 (habitat flag source)
Acanthobothrium coronatum (Rudolphi, 1819) (habitat flag source)
Acanthobothrium coronatum (Rudolphi, 1819) (extant flag source)
Acanthobothrium coronatum (Rudolphi, 1819) (basis of record)
Acanthocarpus alexandri Stimpson, 1871 (habitat flag source)
Acanthocyclops vernalis (Fischer, 1853) (habitat flag source)
Acanthodoris subquadrata (Alder & Hancock, 1845) (habitat flag source)
Acanthodoris subquadrata (Alder & Hancock, 1845) (extant flag source)
Acanthodoris subquadrata (Alder & Hancock, 1845) (basis of record)
Acanthohaustorius intermedius Bousfield, 1965 (habitat flag source)
Acanthohaustorius millsi Bousfield, 1965 (habitat flag source)
Acanthohaustorius virginiana (basis of record)
Acanthohaustorius virginiana (extant flag source)
Acanthohaustorius virginiana (habitat flag source)
Acartia forcipata I.C. Thompson & A. Scott in Thompson, Scott & Herdman, 1898 (habitat flag source)
Acartia hudsonica Pinhey, 1926 (habitat flag source)
Acetes americanus Ortmann, 1893 (habitat flag source)
Achelia spinosa (Stimpson, 1853) (basis of record)
Achelia spinosa (Stimpson, 1853) (extant flag source)
Achnanthes obliqua (Gregory) Hustedt, 1924 (habitat flag source)
Acipenser oxyrhynchus Mitchill, 1814 accepted as Acipenser oxyrinchus Mitchill, 1815 (habitat flag source)
Acirsa borealis (Lyell, 1841) (habitat flag source)
Aclis acuta (Jeffreys, 1884) (habitat flag source)
Aclis acuta (Jeffreys, 1884) (basis of record)
Aclis acuta (Jeffreys, 1884) (extant flag source)
Aclis carolinensis Bartsch, 1911 (habitat flag source)
Aclis striata A.E. Verrill, 1880 (habitat flag source)
Aclis tenuis A.E. Verrill, 1882 (habitat flag source)
Aclis verrilli Bartsch, 1911 (habitat flag source)
Acrochaete parasitica Oltmanns, 1894 accepted as Acrochaete repens Pringsheim, 1863 (habitat flag source)
Acrocirrus leidyi Verrill, 1882 (extant flag source)
Acrocirrus leidyi Verrill, 1882 (habitat flag source)
Acrocirrus leidyi Verrill, 1882 (basis of record)
Acteocina bidentata (d'Orbigny, 1841) (habitat flag source)
Acteocina canaliculata (Say, 1826) (habitat flag source)
Acteocina oryza (Totten, 1835) (habitat flag source)
Acteon melampoides Dall, 1881 (habitat flag source)
Actinauge cristata Riemann-Zürneck, 1986 (habitat flag source)
Actinauge longicornis (Verrill, 1882) (habitat flag source)
Actinauge rugosa Verrill, 1922 accepted as Actinauge verrilli McMurrich, 1893 (habitat flag source)
Actinauge verrilli McMurrich, 1893 (habitat flag source)
Actinernus nobilis Verrill, 1879 (habitat flag source)
Actinia nitida Dawson, 1858 (basis of record)
Actinia nitida Dawson, 1858 (extant flag source)
Actinia nitida Dawson, 1858 (habitat flag source)
Actinia obtruncata Stimpson, 1853 (basis of record)
Actinia obtruncata Stimpson, 1853 (extant flag source)
Actinia obtruncata Stimpson, 1853 (habitat flag source)
Actinia sipunculoides Stimpson, 1853 accepted as Edwardsia sipunculoides (Stimpson, 1853) (habitat flag source)
Actinocythereis dawsoni (Brady, 1870) (extant flag source)
Actinocythereis dawsoni (Brady, 1870) (basis of record)
Actinocythereis dawsoni (Brady, 1870) (habitat flag source)
Actinostola spetsbergensis Carlgren, 1893 (habitat flag source)
Actinothoe modesta (Verrill, 1866) (habitat flag source)
Actinothoe modesta (Verrill, 1866) (extant flag source)
Actinothoe modesta (Verrill, 1866) (basis of record)
Actitis macularia (Linnaeus, 1766) (habitat flag source)
Adamsia sociabilis Verrill, 1882 (habitat flag source)
Admete nodosa Verrill & S. Smith, 1885 (habitat flag source)
Aedes atropalpus (Coquillett, 1902) (habitat flag source)
Aedes atropalpus (Coquillett, 1902) (basis of record)
Aedes atropalpus (Coquillett, 1902) (extant flag source)
Aeginina aenigmatica Laubitz, 1972 (habitat flag source)
Aequipecten glyptus (A.E. Verrill, 1882) (habitat flag source)
Aetea recta (habitat flag source)
Aeverrillia armata (Verrill, 1873) (habitat flag source)
Aeverrillia setigera (Hincks, 1887) (habitat flag source)
Agarum clathratum Dumortier, 1822 (habitat flag source)
Aglantha digitalis (O.F. Mueller, 1776) accepted as Aglantha digitale (O.F. Müller, 1776) (habitat flag source)
Aglantha digitalis (O.F. Mueller, 1776) accepted as Aglantha digitale (O.F. Müller, 1776) (source of synonymy)
Aglantha digitalis (O.F. Mueller, 1776) accepted as Aglantha digitale (O.F. Müller, 1776) (basis of record)
Aglantha digitalis (O.F. Mueller, 1776) accepted as Aglantha digitale (O.F. Müller, 1776) (extant flag source)
Aglaothamnion halliae (F.S. Collins) N.E. Aponte, D.L. Ballantine & J.N. Norris, 1997 (habitat flag source)
Albionella fabricii Rubec & Hogans, 1988 (habitat flag source)
Alcyonidium polyoum (Hassall, 1841) (habitat flag source)
Alcyonidium verrilli Osburn, 1912 (habitat flag source)
Alebion crassus C.B. Wilson, 1932 (habitat flag source)
Alexandrium fundyense Balech, 1985 (habitat flag source)
Aligena elevata (Stimpson, 1851) (habitat flag source)
Almyracuma proximoculi Jones & Burbanck, 1959 (habitat flag source)
Alpheus heterochaelis Say, 1818 (habitat flag source)
Alpheus normanni Kingsley, 1878 (habitat flag source)
Alvania areolata (Stimpson, 1851) (habitat flag source)
Alvania exarata (Stimpson, 1851) (habitat flag source)
Alvania harpa (A.E. Verrill, 1880) (habitat flag source)
Alvania latior (Mighels & C.B. Adams, 1842) (habitat flag source)
Alvania multilineata (Stimpson, 1851) (habitat flag source)
Alvania sandersoni (A.E. Verrill, 1884) (habitat flag source)
Alvania turgida (Verrill, 1880) (habitat flag source)
Amastigos caperatus (extant flag source)
Amastigos caperatus (basis of record)
Amastigos caperatus (habitat flag source)
Amblyosyllis cincinnata (Verrill, 1874) (extant flag source)
Amblyosyllis cincinnata (Verrill, 1874) (basis of record)
Amblyosyllis cincinnata (Verrill, 1874) (habitat flag source)
Ameira curviseta Willey, 1929 (habitat flag source)
Ameira curviseta Willey, 1929 (extant flag source)
Ameira curviseta Willey, 1929 (basis of record)
Ameira longicaudata Nicholls, 1940 accepted as Filexilia trisetosa Conroy-Dalton & Huys, 1997 (habitat flag source)