Acthelmis Lütken, 1875 (basis of record)
Acthelmis intestinalis (Fabricius, 1780) (basis of record)
Actinauge Verrill, 1883 (basis of record)
Actinauge abyssorum Carlgren, 1934 (basis of record)
Actinauge richardi (Marion, 1906) (basis of record)
Actinernidae Stephenson, 1922 (basis of record)
Actinernus Verrill, 1879 (basis of record)
Actinernus michaelsarsi Carlgren, 1918 (basis of record)
Actinia Linnaeus, 1767 (basis of record)
Actinia cari Delle Chiaje, 1822 (basis of record)
Actinia equina (Linnaeus, 1758) (basis of record)
Actinia fragacea Tugwell, 1856 (basis of record)
Actinia prasina Gosse, 1860 (basis of record)
Actinia striata Rizzi, 1907 (basis of record)
Actiniaria incertae sedis (basis of record)
Actiniidae Rafinesque, 1815 (basis of record)
Actinoscyphia Stephenson, 1920 (basis of record)
Actinoscyphia aurelia (Stephenson, 1918) (basis of record)
Actinoscyphia saginata (Verrill, 1882) (basis of record)
Actinoscyphiidae Stephenson, 1920 (basis of record)
Actinostola Verrill, 1883 (basis of record)
Actinostola abyssorum (Danielssen, 1890) (additional source)
Actinostola callosa (Verrill, 1882) (basis of record)
Actinostolidae Carlgren, 1932 (basis of record)
Actinothoe Fischer, 1889 (basis of record)
Actinothoe sphyrodeta (Gosse, 1858) (basis of record)
Adamsia Forbes, 1840 accepted as Calliactis Verrill, 1869 (basis of record)
Adamsia carciniopados (Otto, 1823) accepted as Adamsia palliata (Fabricius, 1779) accepted as Calliactis palliata (Müller, 1776) (basis of record)
Adamsia palliata (Bohadsch, 1761) accepted as Adamsia palliata (Fabricius, 1779) accepted as Calliactis palliata (Müller, 1776) (basis of record)
Aiptasia Gosse, 1858 (basis of record)
Aiptasia couchii Gosse (basis of record)
Aiptasia diaphana (Rapp, 1829) accepted as Exaiptasia diaphana (Rapp, 1829) (basis of record)
Aiptasia mutabilis (Gravenhorst, 1831) (basis of record)
Aiptasiidae Carlgren, 1924 (basis of record)
Aiptasiogeton Schmidt, 1972 (basis of record)
Aiptasiogeton pellucidus (Hollard, 1848) accepted as Aiptasiogeton hyalinus (Delle Chiaje, 1822) (basis of record)
Alicia Johnson, 1861 (basis of record)
Alicia mirabilis Johnson, 1861 (basis of record)
Aliciidae Duerden, 1895 (basis of record)
Allantactis Danielssen, 1890 (basis of record)
Allantactis parasitica Danielssen, 1890 (basis of record)
Amphianthus Hertwig, 1882 (basis of record)
Amphianthus bathybium Hertwig, 1882 (basis of record)
Amphianthus dohrnii (Koch, 1878) (basis of record)
Amphianthus ingolfi Carlgren, 1942 (basis of record)
Amphianthus islandicus Carlgren, 1942 (basis of record)
Amphianthus margaritaceus (Danielssen, 1890) (basis of record)
Amphianthus michaelsarsi Carlgren, 1934 (basis of record)
Amphianthus mopseae (Danielssen, 1890) (basis of record)
Amphianthus norvegicus Carlgren, 1942 (basis of record)
Amphianthus verruculatus Carlgren, 1942 (basis of record)
Andresia (basis of record)
Andresia partenopea (Andrès, 1883) (basis of record)
Andresiidae Stephenson, 1922 (basis of record)
Andvakia Danielssen, 1890 (basis of record)
Andvakia mirabilis Danielssen, 1890 (basis of record)
Andvakia parva Carlgren, 1940 (basis of record)
Andvakiidae Danielssen, 1890 (basis of record)
Anemonactis Andres, 1881 (basis of record)
Anemonactis mazeli (Jourdan, 1880) (basis of record)
Anemonia Risso, 1827 (basis of record)
Anemonia viridis (Forsskål, 1775) (basis of record)
Anthopleura Duchassaing de Fonbressin & Michelotti, 1860 (basis of record)
Anthopleura ballii (Cocks, 1851) (basis of record)
Anthopleura thallia (Gosse, 1854) (basis of record)
Anthosactis Danielssen, 1890 (basis of record)
Anthosactis ingolfi Carlgren, 1921 (basis of record)
Anthosactis janmayeni Danielssen, 1890 (basis of record)
Arachnactidae McMurrich, 1910 (basis of record)
Arachnactis Sars, 1846 (basis of record)
Arachnactis albida Sars, 1846 (basis of record)
Arachnanthus Carlgren, 1912 (basis of record)
Arachnanthus sarsi Carlgren, 1912 (basis of record)
Aulactinia Agassiz in Verrill, 1864 (basis of record)
Aulactinia stella (Verrill, 1864) (basis of record)
Aulactinia verrucosa (Pennant, 1777) accepted as Bunodactis verrucosa (Pennant, 1777) (basis of record)
Bathyphellia Carlgren, 1932 (basis of record)
Bathyphellia margaritacea (Danielssen, 1890) (basis of record)
Bathyphelliidae Carlgren, 1932 (basis of record)
Bolocera Gosse, 1860 (basis of record)
Bolocera maxima Carlgren, 1921 (basis of record)
Bolocera tuediae (Johnston, 1832) (basis of record)
Boloceroididae Carlgren, 1924 (basis of record)
Botrucnidiferidae Carlgren, 1912 (basis of record)
Bunodactis Verrill, 1899 (basis of record)
Bunodactis verrucosa (Pennant, 1777) (basis of record)
Bunodeopsis Andres, 1881 (basis of record)
Bunodeopsis strumosa Andrès, 1881 (basis of record)
Bunodosoma Verrill, 1899 (basis of record)
Cactosoma Danielssen, 1890 (basis of record)
Cactosoma abyssorum Danielssen, 1890 (basis of record)
Calliactis Verrill, 1869 (basis of record)
Calliactis parasitica (Couch, 1842) (basis of record)
Carlgrenia Stephenson, 1918 (basis of record)
Carlgrenia desiderata Stephenson, 1918 (basis of record)
Cataphellia Stephenson, 1929 (basis of record)
Cataphellia brodricii (Gosse, 1859) (basis of record)
Cereus Ilmoni, 1830 (basis of record)
Cereus pedunculatus (Pennant, 1777) (basis of record)
Cerianthidae Milne Edwards & Haime, 1851 (basis of record)