Abietinaria Kirchenpauer, 1884 (basis of record)
Abietinaria abietina (Linnaeus, 1758) (basis of record)
Abietinaria filicula (Ellis & Solander, 1786) (basis of record)
Abietinaria interversa (Pictet & Bedot, 1900) (basis of record)
Abietinaria pulchra (Nutting, 1904) (basis of record)
Acaulis Stimpson, 1853 (basis of record)
Acaulis primarius Stimpson, 1853 (basis of record)
Acauloides Bouillon, 1965 (basis of record)
Acauloides ammisatum Bouillon, 1965 (basis of record)
Acauloides ilonae (Brinckmann-Voss, 1966) (basis of record)
Acryptolaria Norman, 1875 (basis of record)
Acryptolaria conferta (Allman, 1877) (basis of record)
Acryptolaria longitheca (Allman, 1877) (basis of record)
Aegina Eschscholtz, 1829 (basis of record)
Aegina citrea Eschscholtz, 1829 (basis of record)
Aeginopsis Brandt, 1835 (basis of record)
Aeginopsis laurentii Brandt, 1838 (basis of record)
Aeginura Haeckel, 1879 (basis of record)
Aeginura grimaldii Maas, 1904 (basis of record)
Aequorea Péron & Lesueur, 1810 (basis of record)
Aequorea aequorea (Forsskål, 1775) accepted as Aequorea forskalea Péron & Lesueur, 1810 (basis of record)
Aequorea conica Browne, 1905 (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)
Aglantha elata (Haeckel, 1879) (basis of record)
Aglaophenia Lamouroux, 1812 (basis of record)
Aglaophenia acacia Allman, 1883 (basis of record)
Aglaophenia elongata Meneghini, 1845 (basis of record)
Aglaophenia harpago Schenck, 1965 (basis of record)
Aglaophenia kirchenpaueri (Heller, 1868) (basis of record)
Aglaophenia latecarinata Allman, 1877 (basis of record)
Aglaophenia lophocarpa Allman, 1877 (basis of record)
Aglaophenia octodonta (Heller, 1868) (basis of record)
Aglaophenia parvula Bale, 1882 (basis of record)
Aglaophenia picardi Svoboda, 1979 (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)
Aglaura Péron & Lesueur, 1810 (basis of record)
Aglaura hemistoma Péron & Lesueur, 1810 (basis of record)
Amalthaea Schmidt, 1852 accepted as Corymorpha M. Sars, 1835 (basis of record)
Amphinema Haeckel, 1879 (basis of record)
Amphinema biscayana (Browne, 1907) (basis of record)
Amphinema dinema (Péron & Lesueur, 1810) (basis of record)
Amphinema krampi Russell, 1956 (basis of record)
Amphinema rubrum (Kramp, 1957) (basis of record)
Amphinema rugosum (Mayer, 1900) (basis of record)
Amphinema turrida (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)
Anthohebella Boero, Bouillon & Kubota, 1997 (basis of record)
Anthohebella parasitica (Ciamician, 1880) (basis of record)
Arctapodema Dall, 1907 (basis of record)
Arctapodema ampla (Vanhöffen, 1902) (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)
Aselomaris michaeli Berrill, 1948 accepted as Pachycordyle michaeli (Berrill, 1948) (basis of record)
Barcino Gili, Bouillon, Pages, Palanques & Puig, 1999 (basis of record)
Barcino foixensis Gili, Bouillon, Pagès, Palanques & Puig, 1999 (basis of record)
Bedotella Stechow, 1913 (basis of record)
Bedotella armata (Pictet & Bedot, 1900) (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)
Bonneviella Broch, 1909 (basis of record)
Bonneviella grandis (Allman, 1876) (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)
Botrynema ellinorae (Hartlaub, 1909) accepted as Botrynema brucei ellinorae (Hartlaub, 1909) (basis of record)
Bougainvillia Lesson, 1830 (basis of record)
Bougainvillia britannica (Forbes, 1841) (basis of record)
Bougainvillia charcoti Le Danois, 1913 accepted as Nemopsis bachei L. Agassiz, 1849 (basis of record)
Bougainvillia macloviana Lesson, 1830 (basis of record)
Bougainvillia multicilia (Haeckel, 1879) (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 rugosa Clarke, 1882 (basis of record)
Bougainvillia superciliaris (L. Agassiz, 1849) (basis of record)
Branchiocerianthus Mark, 1898 (basis of record)
Branchiocerianthus italicus Stechow, 1921 (basis of record)
Branchiocerianthus norvegicus Brattström, 1956 (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)