Abietinaria Kirchenpauer, 1884 (basis of record)
Abietinaria abietina (Linnaeus, 1758) (basis of record)
Abietinaria filicula (Ellis & Solander, 1786) (basis of record)
Acauloides Bouillon, 1965 (basis of record)
Acauloides ammisatum Bouillon, 1965 (basis of record)
Aegina Eschscholtz, 1829 (basis of record)
Aegina citrea Eschscholtz, 1829 (basis of record)
Aeginura Haeckel, 1879 (basis of record)
Aeginura grimaldii Maas, 1904 (basis of record)
Aequorea Péron & Lesueur, 1810 (basis of record)
Aequorea forskalea Péron & Lesueur, 1810 (basis of record)
Aequorea macrodactyla (Brandt, 1835) (basis of record)
Aequorea pensilis (Haeckel, 1879) (basis of record)
Aequorea vitrina Gosse, 1853 (basis of record)
Aglantha Haeckel, 1879 (basis of record)
Aglantha digitale (O. F. Müller, 1776) (basis of record)
Aglaophenia Lamouroux, 1812 (basis of record)
Aglaophenia acacia Allman, 1883 (basis of record)
Aglaophenia kirchenpaueri (Heller, 1868) (basis of record)
Aglaophenia octodonta (Heller, 1868) (basis of record)
Aglaophenia parvula Bale, 1882 (basis of record)
Aglaophenia pluma (Linnaeus, 1758) (basis of record)
Aglaophenia tubiformis Marktanner-Turneretscher, 1890 (basis of record)
Aglaophenia tubulifera (Hincks, 1861) (basis of record)
Amphinema Haeckel, 1879 (basis of record)
Amphinema dinema (Péron & Lesueur, 1810) (basis of record)
Amphinema rugosum (Mayer, 1900) (basis of record)
Amphisbetia L. Agassiz, 1862 (basis of record)
Amphisbetia operculata (Linnaeus, 1758) (basis of record)
Annatiara Russell, 1940 (basis of record)
Annatiara affinis (Hartlaub, 1914) (basis of record)
Antennella Allman, 1877 (basis of record)
Antennella secundaria (Gmelin, 1791) (basis of record)
Antennella siliquosa (Hincks, 1877) (basis of record)
Armorhydra Swedmark & Teissier, 1958 (basis of record)
Armorhydra janowiczi Swedmark & Teissier, 1958 (basis of record)
Aselomaris Berrill, 1948 accepted as Rhizorhagium M. Sars, 1874 (basis of record)
Aselomaris arenosa (Alder, 1862) accepted as Rhizorhagium arenosum (Alder, 1862) (basis of record)
Bimeria Wright, 1859 (basis of record)
Bimeria vestita Wright, 1859 (basis of record)
Blackfordia Mayer, 1910 (basis of record)
Blackfordia virginica Mayer, 1910 (basis of record)
Boreohydra Westblad, 1937 accepted as Plotocnide Wagner, 1885 (basis of record)
Botrynema Browne, 1908 (basis of record)
Botrynema brucei Browne, 1908 (basis of record)
Bougainvillia Lesson, 1830 (basis of record)
Bougainvillia britannica (Forbes, 1841) (basis of record)
Bougainvillia macloviana Lesson, 1830 (basis of record)
Bougainvillia muscoides (Sars, 1846) (basis of record)
Bougainvillia muscus (Allman, 1863) (basis of record)
Bougainvillia principis (Steenstrup, 1850) (basis of record)
Bougainvillia pyramidata (Forbes & Goodsir, 1853) (basis of record)
Bougainvillia ramosa (Van Beneden, 1844) accepted as Bougainvillia muscus (Allman, 1863) (basis of record)
Bougainvillia superciliaris (L. Agassiz, 1849) (basis of record)
Branchiocerianthus Mark, 1898 (basis of record)
Bythotiara Günther, 1903 (basis of record)
Bythotiara murrayi Günther, 1903 (basis of record)
Calycella Hincks, 1864 in Allman, 1864 (basis of record)
Calycella gracilis Hartlaub, 1897 (basis of record)
Calycella syringa (Linnaeus, 1767) (basis of record)
Campanularia Lamarck, 1816 (basis of record)
Campanularia hincksii Alder, 1856 (basis of record)
Campanularia volubilis (Linnaeus, 1758) (basis of record)
Candelabrum de Blainville, 1830 (basis of record)
Candelabrum cocksii (Cocks, 1854) (basis of record)
Candelabrum phrygium (Fabricius, 1780) (basis of record)
Cladocarpus Allman, 1874 (basis of record)
Cladocarpus formosus Allman, 1877 (basis of record)
Cladonema Dujardin, 1843 (basis of record)
Cladonema radiatum Dujardin, 1843 (basis of record)
Clava Gmelin, 1791 (basis of record)
Clava multicornis (Forsskål, 1775) (basis of record)
Clavopsella Stechow, 1919 accepted as Pachycordyle Weismann, 1883 (basis of record)
Clavopsella navis (Millard, 1959) accepted as Pachycordyle michaeli (Berrill, 1948) (basis of record)
Clytia Lamouroux, 1812 (basis of record)
Clytia gracilis (M. Sars, 1851) (basis of record)
Clytia hemisphaerica (Linnaeus, 1767) (basis of record)
Clytia paulensis (Vanhöffen, 1910) (basis of record)
Colobonema Vanhöffen, 1902 (basis of record)
Colobonema sericeum Vanhöffen, 1902 (basis of record)
Cordylophora Allman, 1844 (basis of record)
Cordylophora caspia (Pallas, 1771) (basis of record)
Corymorpha M. Sars, 1835 (basis of record)
Corymorpha nana Alder, 1857 (basis of record)
Corymorpha nutans M. Sars, 1835 (basis of record)
Coryne Gaertner, 1774 (basis of record)
Coryne muscoides (Linnaeus, 1761) (basis of record)
Coryne pintneri Schneider, 1897 (basis of record)
Coryne pusilla Gaertner, 1774 (basis of record)
Cosmetira Forbes, 1848 (basis of record)
Cosmetira pilosella Forbes, 1848 (basis of record)
Craspedacusta Lankester, 1880 (basis of record)
Craspedacusta sowerbii Lankester, 1880 (basis of record)
Crossota Vanhöffen, 1902 (basis of record)
Crossota rufobrunnea (Kramp, 1913) (basis of record)
Cuspidella Hincks, 1866 (basis of record)
Cyclocanna Bigelow, 1918 (basis of record)
Cyclocanna welshi Bigelow, 1918 accepted as Cyclocanna producta (G.O. Sars, 1874) (basis of record)
Dicoryne Allman, 1859 (basis of record)
Dicoryne conferta (Alder, 1856) (basis of record)